MiMO_iOS/TUIKit/TIMCommon/CommonModel/TUIAttributedLabel.m

//  Created by Tencent on 2023/06/09.
//  Copyright © 2023 Tencent. All rights reserved.
// TUIAttributedLabel.m

#import "TUIAttributedLabel.h"

#import <Availability.h>
#import <QuartzCore/QuartzCore.h>
#import <objc/runtime.h>

#define kTUILineBreakWordWrapTextWidthScalingFactor (M_PI / M_E)

static CGFloat const TUIFLOAT_MAX = 100000;

NSString *const kTUIStrikeOutAttributeName = @"TUIStrikeOutAttribute";
NSString *const kTUIBackgroundFillColorAttributeName = @"TUIBackgroundFillColor";
NSString *const kTUIBackgroundFillPaddingAttributeName = @"TUIBackgroundFillPadding";
NSString *const kTUIBackgroundStrokeColorAttributeName = @"TUIBackgroundStrokeColor";
NSString *const kTUIBackgroundLineWidthAttributeName = @"TUIBackgroundLineWidth";
NSString *const kTUIBackgroundCornerRadiusAttributeName = @"TUIBackgroundCornerRadius";

const NSTextAlignment TUITextAlignmentLeft = NSTextAlignmentLeft;
const NSTextAlignment TUITextAlignmentCenter = NSTextAlignmentCenter;
const NSTextAlignment TUITextAlignmentRight = NSTextAlignmentRight;
const NSTextAlignment TUITextAlignmentJustified = NSTextAlignmentJustified;
const NSTextAlignment TUITextAlignmentNatural = NSTextAlignmentNatural;

const NSLineBreakMode TUILineBreakByWordWrapping = NSLineBreakByWordWrapping;
const NSLineBreakMode TUILineBreakByCharWrapping = NSLineBreakByCharWrapping;
const NSLineBreakMode TUILineBreakByClipping = NSLineBreakByClipping;
const NSLineBreakMode TUILineBreakByTruncatingHead = NSLineBreakByTruncatingHead;
const NSLineBreakMode TUILineBreakByTruncatingMiddle = NSLineBreakByTruncatingMiddle;
const NSLineBreakMode TUILineBreakByTruncatingTail = NSLineBreakByTruncatingTail;

typedef NSTextAlignment TUITextAlignment;
typedef NSLineBreakMode TUILineBreakMode;

static inline CGFLOAT_TYPE formatCGFloatCeil(CGFLOAT_TYPE cgfloat) {
#if CGFLOAT_IS_DOUBLE
    return ceil(cgfloat);
#else
    return ceilf(cgfloat);
#endif
}

static inline CGFLOAT_TYPE formatCGFloatFloor(CGFLOAT_TYPE cgfloat) {
#if CGFLOAT_IS_DOUBLE
    return floor(cgfloat);
#else
    return floorf(cgfloat);
#endif
}

static inline CGFLOAT_TYPE formatCGFloatRound(CGFLOAT_TYPE cgfloat) {
#if CGFLOAT_IS_DOUBLE
    return round(cgfloat);
#else
    return roundf(cgfloat);
#endif
}

static inline CGFLOAT_TYPE formatCGFloatSqrt(CGFLOAT_TYPE cgfloat) {
#if CGFLOAT_IS_DOUBLE
    return sqrt(cgfloat);
#else
    return sqrtf(cgfloat);
#endif
}

static inline CGFloat flushFactorForTextAlignment(NSTextAlignment textAlignment) {
    switch (textAlignment) {
        case TUITextAlignmentCenter:
            return 0.5f;
        case TUITextAlignmentRight:
            return 1.0f;
        case TUITextAlignmentLeft:
        default:
            return 0.0f;
    }
}

static inline NSDictionary *formatNSAttributedStringAttributesFromLabel(TUIAttributedLabel *label) {
    NSMutableDictionary *mutableAttributes = [NSMutableDictionary dictionary];

    [mutableAttributes setObject:label.font forKey:(NSString *)kCTFontAttributeName];
    [mutableAttributes setObject:label.textColor forKey:(NSString *)kCTForegroundColorAttributeName];
    [mutableAttributes setObject:@(label.kern) forKey:(NSString *)kCTKernAttributeName];

    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    paragraphStyle.alignment = label.textAlignment;
    paragraphStyle.lineSpacing = label.lineSpacing;
    paragraphStyle.minimumLineHeight = label.minimumLineHeight > 0 ? label.minimumLineHeight : label.font.lineHeight * label.lineHeightMultiple;
    paragraphStyle.maximumLineHeight = label.maximumLineHeight > 0 ? label.maximumLineHeight : label.font.lineHeight * label.lineHeightMultiple;
    paragraphStyle.lineHeightMultiple = label.lineHeightMultiple;
    paragraphStyle.firstLineHeadIndent = label.firstLineIndent;

    if (label.numberOfLines == 1) {
        paragraphStyle.lineBreakMode = label.lineBreakMode;
    } else {
        paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;
    }

    [mutableAttributes setObject:paragraphStyle forKey:(NSString *)kCTParagraphStyleAttributeName];

    return [NSDictionary dictionaryWithDictionary:mutableAttributes];
}

static inline CGColorRef formatCGColorRefFromColor(id color);
static inline NSDictionary *convertNSAttributedStringAttributesToCTAttributes(NSDictionary *attributes);

static inline NSAttributedString *formatNSAttributedStringByScalingFontSize(NSAttributedString *attributedString, CGFloat scale) {
    NSMutableAttributedString *mutableAttributedString = [attributedString mutableCopy];
    [mutableAttributedString enumerateAttribute:(NSString *)kCTFontAttributeName
                                        inRange:NSMakeRange(0, [mutableAttributedString length])
                                        options:0
                                     usingBlock:^(id value, NSRange range, BOOL *__unused stop) {
                                       UIFont *font = (UIFont *)value;
                                       if (font) {
                                           NSString *fontName;
                                           CGFloat pointSize;

                                           if ([font isKindOfClass:[UIFont class]]) {
                                               fontName = font.fontName;
                                               pointSize = font.pointSize;
                                           } else {
                                               fontName = (NSString *)CFBridgingRelease(CTFontCopyName((__bridge CTFontRef)font, kCTFontPostScriptNameKey));
                                               pointSize = CTFontGetSize((__bridge CTFontRef)font);
                                           }

                                           [mutableAttributedString removeAttribute:(NSString *)kCTFontAttributeName range:range];
                                           CTFontRef fontRef =
                                               CTFontCreateWithName((__bridge CFStringRef)fontName, formatCGFloatFloor(pointSize * scale), NULL);
                                           [mutableAttributedString addAttribute:(NSString *)kCTFontAttributeName value:(__bridge id)fontRef range:range];
                                           CFRelease(fontRef);
                                       }
                                     }];

    return mutableAttributedString;
}

static inline NSAttributedString *formatNSAttributedStringBySettingColorFromContext(NSAttributedString *attributedString, UIColor *color) {
    if (!color) {
        return attributedString;
    }

    NSMutableAttributedString *mutableAttributedString = [attributedString mutableCopy];
    [mutableAttributedString enumerateAttribute:(NSString *)kCTForegroundColorFromContextAttributeName
                                        inRange:NSMakeRange(0, [mutableAttributedString length])
                                        options:0
                                     usingBlock:^(id value, NSRange range, __unused BOOL *stop) {
                                       BOOL usesColorFromContext = (BOOL)value;
                                       if (usesColorFromContext) {
                                           [mutableAttributedString
                                               setAttributes:[NSDictionary dictionaryWithObject:color forKey:(NSString *)kCTForegroundColorAttributeName]
                                                       range:range];
                                           [mutableAttributedString removeAttribute:(NSString *)kCTForegroundColorFromContextAttributeName range:range];
                                       }
                                     }];

    return mutableAttributedString;
}

static inline CGSize formatCTFramesetterSuggestFrameSizeForAttributedStringWithConstraints(CTFramesetterRef framesetter, NSAttributedString *attributedString,
                                                                                           CGSize size, NSUInteger numberOfLines) {
    CFRange rangeToSize = CFRangeMake(0, (CFIndex)[attributedString length]);
    CGSize constraints = CGSizeMake(size.width, TUIFLOAT_MAX);

    if (numberOfLines == 1) {
        // If there is one line, the size that fits is the full width of the line
        constraints = CGSizeMake(TUIFLOAT_MAX, TUIFLOAT_MAX);
    } else if (numberOfLines > 0) {
        // If the line count of the label more than 1, limit the range to size to the number of lines that have been set
        CGMutablePathRef path = CGPathCreateMutable();
        CGPathAddRect(path, NULL, CGRectMake(0.0f, 0.0f, constraints.width, TUIFLOAT_MAX));
        CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), path, NULL);
        CFArrayRef lines = CTFrameGetLines(frame);

        if (CFArrayGetCount(lines) > 0) {
            NSInteger lastVisibleLineIndex = MIN((CFIndex)numberOfLines, CFArrayGetCount(lines)) - 1;
            CTLineRef lastVisibleLine = CFArrayGetValueAtIndex(lines, lastVisibleLineIndex);

            CFRange rangeToLayout = CTLineGetStringRange(lastVisibleLine);
            rangeToSize = CFRangeMake(0, rangeToLayout.location + rangeToLayout.length);
        }

        CFRelease(frame);
        CGPathRelease(path);
    }

    CGSize suggestedSize = CTFramesetterSuggestFrameSizeWithConstraints(framesetter, rangeToSize, NULL, constraints, NULL);

    return CGSizeMake(formatCGFloatCeil(suggestedSize.width), formatCGFloatCeil(suggestedSize.height));
}

@interface TUIAccessibilityElement : UIAccessibilityElement
@property(nonatomic, weak) UIView *superview;
@property(nonatomic, assign) CGRect boundingRect;
@end

@implementation TUIAccessibilityElement

- (CGRect)accessibilityFrame {
    return UIAccessibilityConvertFrameToScreenCoordinates(self.boundingRect, self.superview);
}

@end

@interface TUIAttributedLabel ()
@property(readwrite, nonatomic, copy) NSAttributedString *inactiveAttributedText;
@property(readwrite, nonatomic, copy) NSAttributedString *renderedAttributedText;
@property(readwrite, atomic, strong) NSDataDetector *dataDetector;
@property(readwrite, nonatomic, strong) NSArray *linkModels;
@property(readwrite, nonatomic, strong) TUIAttributedLabelLink *activeLink;
@property(readwrite, nonatomic, strong) NSArray *accessibilityElements;

- (void)longPressGestureDidFire:(UILongPressGestureRecognizer *)sender;
@end

@implementation TUIAttributedLabel {
@private
    BOOL _needsFramesetter;
    CTFramesetterRef _framesetter;
    CTFramesetterRef _highlightFramesetter;
}

@dynamic text;
@synthesize attributedText = _attributedText;

#ifndef kCFCoreFoundationVersionNumber_iOS_7_0
#define kCFCoreFoundationVersionNumber_iOS_7_0 847.2
#endif

+ (void)load {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
      if (kCFCoreFoundationVersionNumber < kCFCoreFoundationVersionNumber_iOS_7_0) {
          Class class = [self class];
          Class superclass = class_getSuperclass(class);

          NSArray *strings = @[
              NSStringFromSelector(@selector(isAccessibilityElement)),
              NSStringFromSelector(@selector(accessibilityElementCount)),
              NSStringFromSelector(@selector(accessibilityElementAtIndex:)),
              NSStringFromSelector(@selector(indexOfAccessibilityElement:)),
          ];

          for (NSString *string in strings) {
              SEL selector = NSSelectorFromString(string);
              IMP superImplementation = class_getMethodImplementation(superclass, selector);
              Method method = class_getInstanceMethod(class, selector);
              const char *types = method_getTypeEncoding(method);
              class_replaceMethod(class, selector, superImplementation, types);
          }
      }
    });
}

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (!self) {
        return nil;
    }

    [self commonInit];

    return self;
}

- (void)commonInit {
    self.userInteractionEnabled = YES;
#if !TARGET_OS_TV
    self.multipleTouchEnabled = NO;
#endif

    self.textInsets = UIEdgeInsetsZero;
    self.lineHeightMultiple = 1.0f;

    self.linkModels = [NSArray array];

    self.linkBackgroundEdgeInset = UIEdgeInsetsMake(0.0f, -1.0f, 0.0f, -1.0f);

    NSMutableDictionary *mutableLinkAttributes = [NSMutableDictionary dictionary];
    [mutableLinkAttributes setObject:[NSNumber numberWithBool:YES] forKey:(NSString *)kCTUnderlineStyleAttributeName];

    NSMutableDictionary *mutableActiveLinkAttributes = [NSMutableDictionary dictionary];
    [mutableActiveLinkAttributes setObject:[NSNumber numberWithBool:NO] forKey:(NSString *)kCTUnderlineStyleAttributeName];

    NSMutableDictionary *mutableInactiveLinkAttributes = [NSMutableDictionary dictionary];
    [mutableInactiveLinkAttributes setObject:[NSNumber numberWithBool:NO] forKey:(NSString *)kCTUnderlineStyleAttributeName];

    if ([NSMutableParagraphStyle class]) {
        [mutableLinkAttributes setObject:[UIColor blueColor] forKey:(NSString *)kCTForegroundColorAttributeName];
        [mutableActiveLinkAttributes setObject:[UIColor redColor] forKey:(NSString *)kCTForegroundColorAttributeName];
        [mutableInactiveLinkAttributes setObject:[UIColor grayColor] forKey:(NSString *)kCTForegroundColorAttributeName];
    } else {
        [mutableLinkAttributes setObject:(__bridge id)[[UIColor blueColor] CGColor] forKey:(NSString *)kCTForegroundColorAttributeName];
        [mutableActiveLinkAttributes setObject:(__bridge id)[[UIColor redColor] CGColor] forKey:(NSString *)kCTForegroundColorAttributeName];
        [mutableInactiveLinkAttributes setObject:(__bridge id)[[UIColor grayColor] CGColor] forKey:(NSString *)kCTForegroundColorAttributeName];
    }

    self.linkAttributes = [NSDictionary dictionaryWithDictionary:mutableLinkAttributes];
    self.activeLinkAttributes = [NSDictionary dictionaryWithDictionary:mutableActiveLinkAttributes];
    self.inactiveLinkAttributes = [NSDictionary dictionaryWithDictionary:mutableInactiveLinkAttributes];
    _extendsLinkTouchArea = NO;
    _longPressGestureRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressGestureDidFire:)];
    self.longPressGestureRecognizer.delegate = self;
    [self addGestureRecognizer:self.longPressGestureRecognizer];
}

- (void)dealloc {
    if (_framesetter) {
        CFRelease(_framesetter);
    }

    if (_highlightFramesetter) {
        CFRelease(_highlightFramesetter);
    }

    if (_longPressGestureRecognizer) {
        [self removeGestureRecognizer:_longPressGestureRecognizer];
    }
}

#pragma mark -

+ (CGSize)sizeThatFitsAttributedString:(NSAttributedString *)attributedString withConstraints:(CGSize)size limitedToNumberOfLines:(NSUInteger)numberOfLines {
    if (!attributedString || attributedString.length == 0) {
        return CGSizeZero;
    }

    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)attributedString);

    CGSize calculatedSize = formatCTFramesetterSuggestFrameSizeForAttributedStringWithConstraints(framesetter, attributedString, size, numberOfLines);

    CFRelease(framesetter);

    return calculatedSize;
}

#pragma mark -

- (void)setAttributedText:(NSAttributedString *)text {
    if ([text isEqualToAttributedString:_attributedText]) {
        return;
    }

    _attributedText = [text copy];

    [self setNeedsFramesetter];
    [self setNeedsDisplay];

    if ([self respondsToSelector:@selector(invalidateIntrinsicContentSize)]) {
        [self invalidateIntrinsicContentSize];
    }

    [super setText:[self.attributedText string]];
}

- (NSAttributedString *)renderedAttributedText {
    if (!_renderedAttributedText) {
        NSMutableAttributedString *fullString = [[NSMutableAttributedString alloc] initWithAttributedString:self.attributedText];

        if (self.attributedTruncationToken) {
            [fullString appendAttributedString:self.attributedTruncationToken];
        }

        NSAttributedString *string = [[NSAttributedString alloc] initWithAttributedString:fullString];
        self.renderedAttributedText = formatNSAttributedStringBySettingColorFromContext(string, self.textColor);
    }

    return _renderedAttributedText;
}

- (NSArray *)links {
    return [_linkModels valueForKey:@"result"];
}

- (void)setLinkModels:(NSArray *)linkModels {
    _linkModels = linkModels;

    self.accessibilityElements = nil;
}

- (void)setNeedsFramesetter {
    // Reset the rendered attributed text so it has a chance to regenerate
    self.renderedAttributedText = nil;

    _needsFramesetter = YES;
}

- (CTFramesetterRef)framesetter {
    if (_needsFramesetter) {
        @synchronized(self) {
            CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)self.renderedAttributedText);
            [self setFramesetter:framesetter];
            [self setHighlightFramesetter:nil];
            _needsFramesetter = NO;

            if (framesetter) {
                CFRelease(framesetter);
            }
        }
    }

    return _framesetter;
}

- (void)setFramesetter:(CTFramesetterRef)framesetter {
    if (framesetter) {
        CFRetain(framesetter);
    }

    if (_framesetter) {
        CFRelease(_framesetter);
    }

    _framesetter = framesetter;
}

- (CTFramesetterRef)highlightFramesetter {
    return _highlightFramesetter;
}

- (void)setHighlightFramesetter:(CTFramesetterRef)highlightFramesetter {
    if (highlightFramesetter) {
        CFRetain(highlightFramesetter);
    }

    if (_highlightFramesetter) {
        CFRelease(_highlightFramesetter);
    }

    _highlightFramesetter = highlightFramesetter;
}

#pragma mark -

- (void)setEnabledTextCheckingTypes:(NSTextCheckingTypes)enabledTextCheckingTypes {
    if (self.enabledTextCheckingTypes == enabledTextCheckingTypes) {
        return;
    }

    _enabledTextCheckingTypes = enabledTextCheckingTypes;

    // one detector instance per type (combination), fast reuse e.g. in cells
    static NSMutableDictionary *dataDetectorsByType = nil;

    if (!dataDetectorsByType) {
        dataDetectorsByType = [NSMutableDictionary dictionary];
    }

    if (enabledTextCheckingTypes) {
        if (![dataDetectorsByType objectForKey:@(enabledTextCheckingTypes)]) {
            NSDataDetector *detector = [NSDataDetector dataDetectorWithTypes:enabledTextCheckingTypes error:nil];
            if (detector) {
                [dataDetectorsByType setObject:detector forKey:@(enabledTextCheckingTypes)];
            }
        }
        self.dataDetector = [dataDetectorsByType objectForKey:@(enabledTextCheckingTypes)];
    } else {
        self.dataDetector = nil;
    }
}

- (void)addLink:(TUIAttributedLabelLink *)link {
    [self addLinks:@[ link ]];
}

- (void)addLinks:(NSArray *)links {
    NSMutableArray *mutableLinkModels = [NSMutableArray arrayWithArray:self.linkModels];

    NSMutableAttributedString *mutableAttributedString = [self.attributedText mutableCopy];

    for (TUIAttributedLabelLink *link in links) {
        if (link.attributes) {
            [mutableAttributedString addAttributes:link.attributes range:link.result.range];
        }
    }

    self.attributedText = mutableAttributedString;
    [self setNeedsDisplay];

    [mutableLinkModels addObjectsFromArray:links];

    self.linkModels = [NSArray arrayWithArray:mutableLinkModels];
}

- (TUIAttributedLabelLink *)addLinkWithTextCheckingResult:(NSTextCheckingResult *)result attributes:(NSDictionary *)attributes {
    return [self addLinksWithTextCheckingResults:@[ result ] attributes:attributes].firstObject;
}

- (NSArray *)addLinksWithTextCheckingResults:(NSArray *)results attributes:(NSDictionary *)attributes {
    NSMutableArray *links = [NSMutableArray array];

    for (NSTextCheckingResult *result in results) {
        NSDictionary *activeAttributes = attributes ? self.activeLinkAttributes : nil;
        NSDictionary *inactiveAttributes = attributes ? self.inactiveLinkAttributes : nil;

        TUIAttributedLabelLink *link = [[TUIAttributedLabelLink alloc] initWithAttributes:attributes
                                                                         activeAttributes:activeAttributes
                                                                       inactiveAttributes:inactiveAttributes
                                                                       textCheckingResult:result];

        [links addObject:link];
    }

    [self addLinks:links];

    return links;
}

- (TUIAttributedLabelLink *)addLinkWithTextCheckingResult:(NSTextCheckingResult *)result {
    return [self addLinkWithTextCheckingResult:result attributes:self.linkAttributes];
}

- (TUIAttributedLabelLink *)addLinkToURL:(NSURL *)url withRange:(NSRange)range {
    return [self addLinkWithTextCheckingResult:[NSTextCheckingResult linkCheckingResultWithRange:range URL:url]];
}

- (TUIAttributedLabelLink *)addLinkToAddress:(NSDictionary *)addressComponents withRange:(NSRange)range {
    return [self addLinkWithTextCheckingResult:[NSTextCheckingResult addressCheckingResultWithRange:range components:addressComponents]];
}

- (TUIAttributedLabelLink *)addLinkToPhoneNumber:(NSString *)phoneNumber withRange:(NSRange)range {
    return [self addLinkWithTextCheckingResult:[NSTextCheckingResult phoneNumberCheckingResultWithRange:range phoneNumber:phoneNumber]];
}

- (TUIAttributedLabelLink *)addLinkToDate:(NSDate *)date withRange:(NSRange)range {
    return [self addLinkWithTextCheckingResult:[NSTextCheckingResult dateCheckingResultWithRange:range date:date]];
}

- (TUIAttributedLabelLink *)addLinkToDate:(NSDate *)date timeZone:(NSTimeZone *)timeZone duration:(NSTimeInterval)duration withRange:(NSRange)range {
    return [self addLinkWithTextCheckingResult:[NSTextCheckingResult dateCheckingResultWithRange:range date:date timeZone:timeZone duration:duration]];
}

- (TUIAttributedLabelLink *)addLinkToTransitInformation:(NSDictionary *)components withRange:(NSRange)range {
    return [self addLinkWithTextCheckingResult:[NSTextCheckingResult transitInformationCheckingResultWithRange:range components:components]];
}

#pragma mark -

- (BOOL)containslinkAtPoint:(CGPoint)point {
    return [self linkAtPoint:point] != nil;
}

- (TUIAttributedLabelLink *)linkAtPoint:(CGPoint)point {
    // Stop quickly if none of the points to be tested are in the bounds.
    if (!CGRectContainsPoint(CGRectInset(self.bounds, -15.f, -15.f), point) || self.links.count == 0) {
        return nil;
    }

    TUIAttributedLabelLink *result = [self linkAtCharacterIndex:[self characterIndexAtPoint:point]];

    if (!result && self.extendsLinkTouchArea) {
        result = [self linkAtRadius:2.5f aroundPoint:point]
              ?: [self linkAtRadius:5.f aroundPoint:point]
              ?: [self linkAtRadius:7.5f aroundPoint:point]
              ?: [self linkAtRadius:12.5f aroundPoint:point]
              ?: [self linkAtRadius:15.f aroundPoint:point];
    }

    return result;
}

- (TUIAttributedLabelLink *)linkAtRadius:(const CGFloat)radius aroundPoint:(CGPoint)point {
    const CGFloat diagonal = formatCGFloatSqrt(2 * radius * radius);
    const CGPoint deltas[] = {
        CGPointMake(0, -radius),           CGPointMake(0, radius),  // Above and below
        CGPointMake(-radius, 0),           CGPointMake(radius, 0),  // Beside
        CGPointMake(-diagonal, -diagonal), CGPointMake(-diagonal, diagonal), CGPointMake(diagonal, diagonal), CGPointMake(diagonal, -diagonal)  // Diagonal
    };
    const size_t count = sizeof(deltas) / sizeof(CGPoint);

    TUIAttributedLabelLink *link = nil;

    for (NSUInteger i = 0; i < count && link.result == nil; i++) {
        CGPoint currentPoint = CGPointMake(point.x + deltas[i].x, point.y + deltas[i].y);
        link = [self linkAtCharacterIndex:[self characterIndexAtPoint:currentPoint]];
    }

    return link;
}

- (TUIAttributedLabelLink *)linkAtCharacterIndex:(CFIndex)idx {
    // Do not enumerate if the index is outside of the bounds of the text.
    if (!NSLocationInRange((NSUInteger)idx, NSMakeRange(0, self.attributedText.length))) {
        return nil;
    }

    NSEnumerator *enumerator = [self.linkModels reverseObjectEnumerator];
    TUIAttributedLabelLink *link = nil;
    while ((link = [enumerator nextObject])) {
        if (NSLocationInRange((NSUInteger)idx, link.result.range)) {
            return link;
        }
    }

    return nil;
}

- (CFIndex)characterIndexAtPoint:(CGPoint)p {
    if (!CGRectContainsPoint(self.bounds, p)) {
        return NSNotFound;
    }

    CGRect textRect = [self textRectForBounds:self.bounds limitedToNumberOfLines:self.numberOfLines];
    if (!CGRectContainsPoint(textRect, p)) {
        return NSNotFound;
    }

    // Offset tap coordinates by textRect origin to make them relative to the origin of frame
    p = CGPointMake(p.x - textRect.origin.x, p.y - textRect.origin.y);
    // Convert tap coordinates (start at top left) to CT coordinates (start at bottom left)
    p = CGPointMake(p.x, textRect.size.height - p.y);

    CGMutablePathRef path = CGPathCreateMutable();
    CGPathAddRect(path, NULL, textRect);
    CTFrameRef frame = CTFramesetterCreateFrame([self framesetter], CFRangeMake(0, (CFIndex)[self.attributedText length]), path, NULL);
    if (frame == NULL) {
        CGPathRelease(path);
        return NSNotFound;
    }

    CFArrayRef lines = CTFrameGetLines(frame);
    NSInteger numberOfLines = self.numberOfLines > 0 ? MIN(self.numberOfLines, CFArrayGetCount(lines)) : CFArrayGetCount(lines);
    if (numberOfLines == 0) {
        CFRelease(frame);
        CGPathRelease(path);
        return NSNotFound;
    }

    CFIndex idx = NSNotFound;

    CGPoint lineOrigins[numberOfLines];
    CTFrameGetLineOrigins(frame, CFRangeMake(0, numberOfLines), lineOrigins);

    for (CFIndex lineIndex = 0; lineIndex < numberOfLines; lineIndex++) {
        CGPoint lineOrigin = lineOrigins[lineIndex];
        CTLineRef line = CFArrayGetValueAtIndex(lines, lineIndex);

        // Get bounding information of line
        CGFloat ascent = 0.0f, descent = 0.0f, leading = 0.0f;
        CGFloat width = (CGFloat)CTLineGetTypographicBounds(line, &ascent, &descent, &leading);
        CGFloat yMin = (CGFloat)floor(lineOrigin.y - descent);
        CGFloat yMax = (CGFloat)ceil(lineOrigin.y + ascent);

        // Apply penOffset using flushFactor for horizontal alignment to set lineOrigin since this is the horizontal offset from drawFramesetter
        CGFloat flushFactor = flushFactorForTextAlignment(self.textAlignment);
        CGFloat penOffset = (CGFloat)CTLineGetPenOffsetForFlush(line, flushFactor, textRect.size.width);
        lineOrigin.x = penOffset;

        // Check if we've already passed the line
        if (p.y > yMax) {
            break;
        }
        // Check if the point is within this line vertically
        if (p.y >= yMin) {
            // Check if the point is within this line horizontally
            if (p.x >= lineOrigin.x && p.x <= lineOrigin.x + width) {
                // Convert CT coordinates to line-relative coordinates
                CGPoint relativePoint = CGPointMake(p.x - lineOrigin.x, p.y - lineOrigin.y);
                idx = CTLineGetStringIndexForPosition(line, relativePoint);
                break;
            }
        }
    }

    CFRelease(frame);
    CGPathRelease(path);

    return idx;
}

- (CGRect)boundingRectForCharacterRange:(NSRange)range {
    NSMutableAttributedString *mutableAttributedString = [self.attributedText mutableCopy];

    NSTextStorage *textStorage = [[NSTextStorage alloc] initWithAttributedString:mutableAttributedString];

    NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];
    [textStorage addLayoutManager:layoutManager];

    NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:self.bounds.size];
    [layoutManager addTextContainer:textContainer];

    NSRange glyphRange;
    [layoutManager characterRangeForGlyphRange:range actualGlyphRange:&glyphRange];

    return [layoutManager boundingRectForGlyphRange:glyphRange inTextContainer:textContainer];
}

- (void)drawFramesetter:(CTFramesetterRef)framesetter
       attributedString:(NSAttributedString *)attributedString
              textRange:(CFRange)textRange
                 inRect:(CGRect)rect
                context:(CGContextRef)c {
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathAddRect(path, NULL, rect);
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter, textRange, path, NULL);

    [self drawBackground:frame inRect:rect context:c];

    CFArrayRef lines = CTFrameGetLines(frame);
    NSInteger numberOfLines = self.numberOfLines > 0 ? MIN(self.numberOfLines, CFArrayGetCount(lines)) : CFArrayGetCount(lines);
    BOOL truncateLastLine = (self.lineBreakMode == TUILineBreakByTruncatingHead || self.lineBreakMode == TUILineBreakByTruncatingMiddle ||
                             self.lineBreakMode == TUILineBreakByTruncatingTail);

    CGPoint lineOrigins[numberOfLines];
    CTFrameGetLineOrigins(frame, CFRangeMake(0, numberOfLines), lineOrigins);

    for (CFIndex lineIndex = 0; lineIndex < numberOfLines; lineIndex++) {
        CGPoint lineOrigin = lineOrigins[lineIndex];
        CGContextSetTextPosition(c, lineOrigin.x, lineOrigin.y);
        CTLineRef line = CFArrayGetValueAtIndex(lines, lineIndex);

        CGFloat descent = 0.0f;
        CTLineGetTypographicBounds((CTLineRef)line, NULL, &descent, NULL);

        // Adjust pen offset for flush depending on text alignment
        CGFloat flushFactor = flushFactorForTextAlignment(self.textAlignment);

        if (lineIndex == numberOfLines - 1 && truncateLastLine) {
            // Check if the range of text in the last line reaches the end of the full attributed string
            CFRange lastLineRange = CTLineGetStringRange(line);

            if (!(lastLineRange.length == 0 && lastLineRange.location == 0) &&
                lastLineRange.location + lastLineRange.length < textRange.location + textRange.length) {
                // Get correct truncationType and attribute position
                CTLineTruncationType truncationType;
                CFIndex truncationAttributePosition = lastLineRange.location;
                TUILineBreakMode lineBreakMode = self.lineBreakMode;

                // Multiple lines, only use UILineBreakModeTailTruncation
                if (numberOfLines != 1) {
                    lineBreakMode = TUILineBreakByTruncatingTail;
                }

                switch (lineBreakMode) {
                    case TUILineBreakByTruncatingHead:
                        truncationType = kCTLineTruncationStart;
                        break;
                    case TUILineBreakByTruncatingMiddle:
                        truncationType = kCTLineTruncationMiddle;
                        truncationAttributePosition += (lastLineRange.length / 2);
                        break;
                    case TUILineBreakByTruncatingTail:
                    default:
                        truncationType = kCTLineTruncationEnd;
                        truncationAttributePosition += (lastLineRange.length - 1);
                        break;
                }

                NSAttributedString *attributedTruncationString = self.attributedTruncationToken;
                if (!attributedTruncationString) {
                    NSString *truncationTokenString = @"\u2026";  // Unicode Character 'HORIZONTAL ELLIPSIS' (U+2026)

                    NSDictionary *truncationTokenStringAttributes = truncationTokenStringAttributes =
                        [attributedString attributesAtIndex:(NSUInteger)truncationAttributePosition effectiveRange:NULL];

                    attributedTruncationString = [[NSAttributedString alloc] initWithString:truncationTokenString attributes:truncationTokenStringAttributes];
                }
                CTLineRef truncationToken = CTLineCreateWithAttributedString((__bridge CFAttributedStringRef)attributedTruncationString);

                // Append truncationToken to the string
                // because if string isn't too long, CT won't add the truncationToken on its own.
                // There is no chance of a double truncationToken because CT only adds the
                // token if it removes characters (and the one we add will go first)
                NSMutableAttributedString *truncationString = [[NSMutableAttributedString alloc]
                    initWithAttributedString:[attributedString attributedSubstringFromRange:NSMakeRange((NSUInteger)lastLineRange.location,
                                                                                                        (NSUInteger)lastLineRange.length)]];
                if (lastLineRange.length > 0) {
                    // Remove any newline at the end (we don't want newline space between the text and the truncation token). There can only be one, because the
                    // second would be on the next line.
                    unichar lastCharacter = [[truncationString string] characterAtIndex:(NSUInteger)(lastLineRange.length - 1)];
                    if ([[NSCharacterSet newlineCharacterSet] characterIsMember:lastCharacter]) {
                        [truncationString deleteCharactersInRange:NSMakeRange((NSUInteger)(lastLineRange.length - 1), 1)];
                    }
                }
                [truncationString appendAttributedString:attributedTruncationString];
                CTLineRef truncationLine = CTLineCreateWithAttributedString((__bridge CFAttributedStringRef)truncationString);

                // Truncate the line in case it is too long.
                CTLineRef truncatedLine = CTLineCreateTruncatedLine(truncationLine, rect.size.width, truncationType, truncationToken);
                if (!truncatedLine) {
                    // If the line is not as wide as the truncationToken, truncatedLine is NULL
                    truncatedLine = CFRetain(truncationToken);
                }

                CGFloat penOffset = (CGFloat)CTLineGetPenOffsetForFlush(truncatedLine, flushFactor, rect.size.width);
                CGContextSetTextPosition(c, penOffset, lineOrigin.y - descent - self.font.descender);

                CTLineDraw(truncatedLine, c);

                NSRange linkRange;
                if ([attributedTruncationString attribute:NSLinkAttributeName atIndex:0 effectiveRange:&linkRange]) {
                    NSRange tokenRange = [truncationString.string rangeOfString:attributedTruncationString.string];
                    NSRange tokenLinkRange =
                        NSMakeRange((NSUInteger)(lastLineRange.location + lastLineRange.length) - tokenRange.length, (NSUInteger)tokenRange.length);

                    [self addLinkToURL:[attributedTruncationString attribute:NSLinkAttributeName atIndex:0 effectiveRange:&linkRange] withRange:tokenLinkRange];
                }

                CFRelease(truncatedLine);
                CFRelease(truncationLine);
                CFRelease(truncationToken);
            } else {
                CGFloat penOffset = (CGFloat)CTLineGetPenOffsetForFlush(line, flushFactor, rect.size.width);
                CGContextSetTextPosition(c, penOffset, lineOrigin.y - descent - self.font.descender);
                CTLineDraw(line, c);
            }
        } else {
            CGFloat penOffset = (CGFloat)CTLineGetPenOffsetForFlush(line, flushFactor, rect.size.width);
            CGContextSetTextPosition(c, penOffset, lineOrigin.y - descent - self.font.descender);
            CTLineDraw(line, c);
        }
    }

    [self drawStrike:frame inRect:rect context:c];

    CFRelease(frame);
    CGPathRelease(path);
}

- (void)drawBackground:(CTFrameRef)frame inRect:(CGRect)rect context:(CGContextRef)c {
    NSArray *lines = (__bridge NSArray *)CTFrameGetLines(frame);
    CGPoint origins[[lines count]];
    CTFrameGetLineOrigins(frame, CFRangeMake(0, 0), origins);

    CFIndex lineIndex = 0;
    for (id line in lines) {
        CGFloat ascent = 0.0f, descent = 0.0f, leading = 0.0f;
        CGFloat width = (CGFloat)CTLineGetTypographicBounds((__bridge CTLineRef)line, &ascent, &descent, &leading);

        for (id glyphRun in (__bridge NSArray *)CTLineGetGlyphRuns((__bridge CTLineRef)line)) {
            NSDictionary *attributes = (__bridge NSDictionary *)CTRunGetAttributes((__bridge CTRunRef)glyphRun);
            CGColorRef strokeColor = formatCGColorRefFromColor([attributes objectForKey:kTUIBackgroundStrokeColorAttributeName]);
            CGColorRef fillColor = formatCGColorRefFromColor([attributes objectForKey:kTUIBackgroundFillColorAttributeName]);
            UIEdgeInsets fillPadding = [[attributes objectForKey:kTUIBackgroundFillPaddingAttributeName] UIEdgeInsetsValue];
            CGFloat cornerRadius = [[attributes objectForKey:kTUIBackgroundCornerRadiusAttributeName] floatValue];
            CGFloat lineWidth = [[attributes objectForKey:kTUIBackgroundLineWidthAttributeName] floatValue];

            if (strokeColor || fillColor) {
                CGRect runBounds = CGRectZero;
                CGFloat runAscent = 0.0f;
                CGFloat runDescent = 0.0f;

                runBounds.size.width = (CGFloat)CTRunGetTypographicBounds((__bridge CTRunRef)glyphRun, CFRangeMake(0, 0), &runAscent, &runDescent, NULL) +
                                       fillPadding.left + fillPadding.right;
                runBounds.size.height = runAscent + runDescent + fillPadding.top + fillPadding.bottom;

                CGFloat xOffset = 0.0f;
                CFRange glyphRange = CTRunGetStringRange((__bridge CTRunRef)glyphRun);
                switch (CTRunGetStatus((__bridge CTRunRef)glyphRun)) {
                    case kCTRunStatusRightToLeft:
                        xOffset = CTLineGetOffsetForStringIndex((__bridge CTLineRef)line, glyphRange.location + glyphRange.length, NULL);
                        break;
                    default:
                        xOffset = CTLineGetOffsetForStringIndex((__bridge CTLineRef)line, glyphRange.location, NULL);
                        break;
                }

                runBounds.origin.x = origins[lineIndex].x + rect.origin.x + xOffset - fillPadding.left - rect.origin.x;
                runBounds.origin.y = origins[lineIndex].y + rect.origin.y - fillPadding.bottom - rect.origin.y;
                runBounds.origin.y -= runDescent;

                // Don't draw higlightedLinkBackground too far to the right
                if (CGRectGetWidth(runBounds) > width) {
                    runBounds.size.width = width;
                }

                CGPathRef path =
                    [[UIBezierPath bezierPathWithRoundedRect:CGRectInset(UIEdgeInsetsInsetRect(runBounds, self.linkBackgroundEdgeInset), lineWidth, lineWidth)
                                                cornerRadius:cornerRadius] CGPath];

                CGContextSetLineJoin(c, kCGLineJoinRound);

                if (fillColor) {
                    CGContextSetFillColorWithColor(c, fillColor);
                    CGContextAddPath(c, path);
                    CGContextFillPath(c);
                }

                if (strokeColor) {
                    CGContextSetStrokeColorWithColor(c, strokeColor);
                    CGContextAddPath(c, path);
                    CGContextStrokePath(c);
                }
            }
        }

        lineIndex++;
    }
}

- (void)drawStrike:(CTFrameRef)frame inRect:(__unused CGRect)rect context:(CGContextRef)c {
    NSArray *lines = (__bridge NSArray *)CTFrameGetLines(frame);
    CGPoint origins[[lines count]];
    CTFrameGetLineOrigins(frame, CFRangeMake(0, 0), origins);

    CFIndex lineIndex = 0;
    for (id line in lines) {
        CGFloat ascent = 0.0f, descent = 0.0f, leading = 0.0f;
        CGFloat width = (CGFloat)CTLineGetTypographicBounds((__bridge CTLineRef)line, &ascent, &descent, &leading);

        for (id glyphRun in (__bridge NSArray *)CTLineGetGlyphRuns((__bridge CTLineRef)line)) {
            NSDictionary *attributes = (__bridge NSDictionary *)CTRunGetAttributes((__bridge CTRunRef)glyphRun);
            BOOL strikeOut = [[attributes objectForKey:kTUIStrikeOutAttributeName] boolValue];
            NSInteger superscriptStyle = [[attributes objectForKey:(id)kCTSuperscriptAttributeName] integerValue];

            if (strikeOut) {
                CGRect runBounds = CGRectZero;
                CGFloat runAscent = 0.0f;
                CGFloat runDescent = 0.0f;

                runBounds.size.width = (CGFloat)CTRunGetTypographicBounds((__bridge CTRunRef)glyphRun, CFRangeMake(0, 0), &runAscent, &runDescent, NULL);
                runBounds.size.height = runAscent + runDescent;

                CGFloat xOffset = 0.0f;
                CFRange glyphRange = CTRunGetStringRange((__bridge CTRunRef)glyphRun);
                switch (CTRunGetStatus((__bridge CTRunRef)glyphRun)) {
                    case kCTRunStatusRightToLeft:
                        xOffset = CTLineGetOffsetForStringIndex((__bridge CTLineRef)line, glyphRange.location + glyphRange.length, NULL);
                        break;
                    default:
                        xOffset = CTLineGetOffsetForStringIndex((__bridge CTLineRef)line, glyphRange.location, NULL);
                        break;
                }
                runBounds.origin.x = origins[lineIndex].x + xOffset;
                runBounds.origin.y = origins[lineIndex].y;
                runBounds.origin.y -= runDescent;

                // Don't draw strikeout too far to the right
                if (CGRectGetWidth(runBounds) > width) {
                    runBounds.size.width = width;
                }

                switch (superscriptStyle) {
                    case 1:
                        runBounds.origin.y -= runAscent * 0.47f;
                        break;
                    case -1:
                        runBounds.origin.y += runAscent * 0.25f;
                        break;
                    default:
                        break;
                }

                // Use text color, or default to black
                id color = [attributes objectForKey:(id)kCTForegroundColorAttributeName];
                if (color) {
                    CGContextSetStrokeColorWithColor(c, formatCGColorRefFromColor(color));
                } else {
                    CGContextSetGrayStrokeColor(c, 0.0f, 1.0);
                }

                CTFontRef font = CTFontCreateWithName((__bridge CFStringRef)self.font.fontName, self.font.pointSize, NULL);
                CGContextSetLineWidth(c, CTFontGetUnderlineThickness(font));
                CFRelease(font);

                CGFloat y = formatCGFloatRound(runBounds.origin.y + runBounds.size.height / 2.0f);
                CGContextMoveToPoint(c, runBounds.origin.x, y);
                CGContextAddLineToPoint(c, runBounds.origin.x + runBounds.size.width, y);

                CGContextStrokePath(c);
            }
        }

        lineIndex++;
    }
}

#pragma mark - TUIAttributedLabel

- (void)setText:(id)text {
    NSParameterAssert(!text || [text isKindOfClass:[NSAttributedString class]] || [text isKindOfClass:[NSString class]]);

    if ([text isKindOfClass:[NSString class]]) {
        [self setText:text afterInheritingLabelAttributesAndConfiguringWithBlock:nil];
        return;
    }

    self.attributedText = text;
    self.activeLink = nil;

    self.linkModels = [NSArray array];
    if (text && self.attributedText && self.enabledTextCheckingTypes) {
        __weak __typeof(self) weakSelf = self;
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
          __strong __typeof(weakSelf) strongSelf = weakSelf;

          NSDataDetector *dataDetector = strongSelf.dataDetector;
          if (dataDetector && [dataDetector respondsToSelector:@selector(matchesInString:options:range:)]) {
              NSArray *results = [dataDetector matchesInString:[(NSAttributedString *)text string]
                                                       options:0
                                                         range:NSMakeRange(0, [(NSAttributedString *)text length])];
              if ([results count] > 0) {
                  dispatch_async(dispatch_get_main_queue(), ^{
                    if ([[strongSelf.attributedText string] isEqualToString:[(NSAttributedString *)text string]]) {
                        [strongSelf addLinksWithTextCheckingResults:results attributes:strongSelf.linkAttributes];
                    }
                  });
              }
          }
        });
    }

    [self.attributedText enumerateAttribute:NSLinkAttributeName
                                    inRange:NSMakeRange(0, self.attributedText.length)
                                    options:0
                                 usingBlock:^(id value, __unused NSRange range, __unused BOOL *stop) {
                                   if (value) {
                                       NSURL *URL = [value isKindOfClass:[NSString class]] ? [NSURL URLWithString:value] : value;
                                       [self addLinkToURL:URL withRange:range];
                                   }
                                 }];
}

- (void)setText:(id)text
    afterInheritingLabelAttributesAndConfiguringWithBlock:(NSMutableAttributedString * (^)(NSMutableAttributedString *mutableAttributedString))block {
    NSMutableAttributedString *mutableAttributedString = nil;
    if ([text isKindOfClass:[NSString class]]) {
        mutableAttributedString = [[NSMutableAttributedString alloc] initWithString:text attributes:formatNSAttributedStringAttributesFromLabel(self)];
    } else {
        mutableAttributedString = [[NSMutableAttributedString alloc] initWithAttributedString:text];
        [mutableAttributedString addAttributes:formatNSAttributedStringAttributesFromLabel(self) range:NSMakeRange(0, [mutableAttributedString length])];
    }

    if (block) {
        mutableAttributedString = block(mutableAttributedString);
    }

    [self setText:mutableAttributedString];
}

- (void)setActiveLink:(TUIAttributedLabelLink *)activeLink {
    _activeLink = activeLink;

    NSDictionary *activeAttributes = activeLink.activeAttributes ?: self.activeLinkAttributes;

    if (_activeLink && activeAttributes.count > 0) {
        if (!self.inactiveAttributedText) {
            self.inactiveAttributedText = [self.attributedText copy];
        }

        NSMutableAttributedString *mutableAttributedString = [self.inactiveAttributedText mutableCopy];
        if (self.activeLink.result.range.length > 0 &&
            NSLocationInRange(NSMaxRange(self.activeLink.result.range) - 1, NSMakeRange(0, [self.inactiveAttributedText length]))) {
            [mutableAttributedString addAttributes:activeAttributes range:self.activeLink.result.range];
        }

        self.attributedText = mutableAttributedString;
        [self setNeedsDisplay];

        [CATransaction flush];
    } else if (self.inactiveAttributedText) {
        self.attributedText = self.inactiveAttributedText;
        self.inactiveAttributedText = nil;

        [self setNeedsDisplay];
    }
}

- (void)setLinkAttributes:(NSDictionary *)linkAttributes {
    _linkAttributes = convertNSAttributedStringAttributesToCTAttributes(linkAttributes);
}

- (void)setActiveLinkAttributes:(NSDictionary *)activeLinkAttributes {
    _activeLinkAttributes = convertNSAttributedStringAttributesToCTAttributes(activeLinkAttributes);
}

- (void)setInactiveLinkAttributes:(NSDictionary *)inactiveLinkAttributes {
    _inactiveLinkAttributes = convertNSAttributedStringAttributesToCTAttributes(inactiveLinkAttributes);
}

#pragma mark - UILabel

- (void)setHighlighted:(BOOL)highlighted {
    [super setHighlighted:highlighted];
    [self setNeedsDisplay];
}

// Fixes crash when loading from a UIStoryboard
- (UIColor *)textColor {
    UIColor *color = [super textColor];
    if (!color) {
        color = [UIColor blackColor];
    }

    return color;
}

- (void)setTextColor:(UIColor *)textColor {
    UIColor *oldTextColor = self.textColor;
    [super setTextColor:textColor];

    // Redraw to allow any ColorFromContext attributes a chance to update
    if (textColor != oldTextColor) {
        [self setNeedsFramesetter];
        [self setNeedsDisplay];
    }
}

- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines {
    bounds = UIEdgeInsetsInsetRect(bounds, self.textInsets);
    if (!self.attributedText) {
        return [super textRectForBounds:bounds limitedToNumberOfLines:numberOfLines];
    }

    CGRect textRect = bounds;

    // Calculate height with a minimum of double the font pointSize, to ensure that CTFramesetterSuggestFrameSizeWithConstraints doesn't return CGSizeZero, as
    // it would if textRect height is insufficient.
    textRect.size.height = MAX(self.font.lineHeight * MAX(2, numberOfLines), bounds.size.height);

    // Adjust the text to be in the center vertically, if the text size is smaller than bounds
    CGSize textSize =
        CTFramesetterSuggestFrameSizeWithConstraints([self framesetter], CFRangeMake(0, (CFIndex)[self.attributedText length]), NULL, textRect.size, NULL);
    textSize =
        CGSizeMake(formatCGFloatCeil(textSize.width),
                   formatCGFloatCeil(textSize.height));
    // Fix for iOS 4, CTFramesetterSuggestFrameSizeWithConstraints sometimes returns fractional sizes

    if (textSize.height < bounds.size.height) {
        CGFloat yOffset = 0.0f;
        switch (self.verticalAlignment) {
            case TUIAttributedLabelVerticalAlignmentCenter:
                yOffset = formatCGFloatFloor((bounds.size.height - textSize.height) / 2.0f);
                break;
            case TUIAttributedLabelVerticalAlignmentBottom:
                yOffset = bounds.size.height - textSize.height;
                break;
            case TUIAttributedLabelVerticalAlignmentTop:
            default:
                break;
        }

        textRect.origin.y += yOffset;
    }

    return textRect;
}

- (void)drawTextInRect:(CGRect)rect {
    CGRect insetRect = UIEdgeInsetsInsetRect(rect, self.textInsets);
    if (!self.attributedText) {
        [super drawTextInRect:insetRect];
        return;
    }

    NSAttributedString *originalAttributedText = nil;

    // Adjust the font size to fit width, if necessarry
    if (self.adjustsFontSizeToFitWidth && self.numberOfLines > 0) {
        // Framesetter could still be working with a resized version of the text;
        // need to reset so we start from the original font size.
        // See #393.
        [self setNeedsFramesetter];
        [self setNeedsDisplay];

        if ([self respondsToSelector:@selector(invalidateIntrinsicContentSize)]) {
            [self invalidateIntrinsicContentSize];
        }

        // Use infinite width to find the max width, which will be compared to availableWidth if needed.
        CGSize maxSize = (self.numberOfLines > 1) ? CGSizeMake(TUIFLOAT_MAX, TUIFLOAT_MAX) : CGSizeZero;

        CGFloat textWidth = [self sizeThatFits:maxSize].width;
        CGFloat availableWidth = self.frame.size.width * self.numberOfLines;
        if (self.numberOfLines > 1 && self.lineBreakMode == TUILineBreakByWordWrapping) {
            textWidth *= kTUILineBreakWordWrapTextWidthScalingFactor;
        }

        if (textWidth > availableWidth && textWidth > 0.0f) {
            originalAttributedText = [self.attributedText copy];

            CGFloat scaleFactor = availableWidth / textWidth;
            if ([self respondsToSelector:@selector(minimumScaleFactor)] && self.minimumScaleFactor > scaleFactor) {
                scaleFactor = self.minimumScaleFactor;
            }

            self.attributedText = formatNSAttributedStringByScalingFontSize(self.attributedText, scaleFactor);
        }
    }

    CGContextRef c = UIGraphicsGetCurrentContext();
    CGContextSaveGState(c);
    {
        CGContextSetTextMatrix(c, CGAffineTransformIdentity);

        // Inverts the CTM to match iOS coordinates (otherwise text draws upside-down; Mac OS's system is different)
        CGContextTranslateCTM(c, 0.0f, insetRect.size.height);
        CGContextScaleCTM(c, 1.0f, -1.0f);

        CFRange textRange = CFRangeMake(0, (CFIndex)[self.attributedText length]);

        // First, get the text rect (which takes vertical centering into account)
        CGRect textRect = [self textRectForBounds:rect limitedToNumberOfLines:self.numberOfLines];

        // CoreText draws its text aligned to the bottom, so we move the CTM here to take our vertical offsets into account
        CGContextTranslateCTM(c, insetRect.origin.x, insetRect.size.height - textRect.origin.y - textRect.size.height);

        // Second, trace the shadow before the actual text, if we have one
        if (self.shadowColor && !self.highlighted) {
            CGContextSetShadowWithColor(c, self.shadowOffset, self.shadowRadius, [self.shadowColor CGColor]);
        } else if (self.highlightedShadowColor) {
            CGContextSetShadowWithColor(c, self.highlightedShadowOffset, self.highlightedShadowRadius, [self.highlightedShadowColor CGColor]);
        }

        // Finally, draw the text or highlighted text itself (on top of the shadow, if there is one)
        if (self.highlightedTextColor && self.highlighted) {
            NSMutableAttributedString *highlightAttributedString = [self.renderedAttributedText mutableCopy];
            [highlightAttributedString addAttribute:(__bridge NSString *)kCTForegroundColorAttributeName
                                              value:(id)[self.highlightedTextColor CGColor]
                                              range:NSMakeRange(0, highlightAttributedString.length)];

            if (![self highlightFramesetter]) {
                CTFramesetterRef highlightFramesetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)highlightAttributedString);
                [self setHighlightFramesetter:highlightFramesetter];
                CFRelease(highlightFramesetter);
            }

            [self drawFramesetter:[self highlightFramesetter] attributedString:highlightAttributedString textRange:textRange inRect:textRect context:c];
        } else {
            [self drawFramesetter:[self framesetter] attributedString:self.renderedAttributedText textRange:textRange inRect:textRect context:c];
        }

        // If we adjusted the font size, set it back to its original size
        if (originalAttributedText) {
            // Use ivar directly to avoid clearing out framesetter and renderedAttributedText
            _attributedText = originalAttributedText;
        }
    }
    CGContextRestoreGState(c);
}

#pragma mark - UIAccessibilityElement

- (BOOL)isAccessibilityElement {
    return NO;
}

- (NSInteger)accessibilityElementCount {
    return (NSInteger)[[self accessibilityElements] count];
}

- (id)accessibilityElementAtIndex:(NSInteger)index {
    return [[self accessibilityElements] objectAtIndex:(NSUInteger)index];
}

- (NSInteger)indexOfAccessibilityElement:(id)element {
    return (NSInteger)[[self accessibilityElements] indexOfObject:element];
}

- (NSArray *)accessibilityElements {
    if (!_accessibilityElements) {
        @synchronized(self) {
            NSMutableArray *mutableAccessibilityItems = [NSMutableArray array];

            for (TUIAttributedLabelLink *link in self.linkModels) {
                if (link.result.range.location == NSNotFound) {
                    continue;
                }

                NSString *sourceText = [self.text isKindOfClass:[NSString class]] ? self.text : [(NSAttributedString *)self.text string];

                NSString *accessibilityLabel = [sourceText substringWithRange:link.result.range];
                NSString *accessibilityValue = link.accessibilityValue;

                if (accessibilityLabel) {
                    TUIAccessibilityElement *linkElement = [[TUIAccessibilityElement alloc] initWithAccessibilityContainer:self];
                    linkElement.accessibilityTraits = UIAccessibilityTraitLink;
                    linkElement.boundingRect = [self boundingRectForCharacterRange:link.result.range];
                    linkElement.superview = self;
                    linkElement.accessibilityLabel = accessibilityLabel;

                    if (![accessibilityLabel isEqualToString:accessibilityValue]) {
                        linkElement.accessibilityValue = accessibilityValue;
                    }

                    [mutableAccessibilityItems addObject:linkElement];
                }
            }

            TUIAccessibilityElement *baseElement = [[TUIAccessibilityElement alloc] initWithAccessibilityContainer:self];
            baseElement.accessibilityLabel = [super accessibilityLabel];
            baseElement.accessibilityHint = [super accessibilityHint];
            baseElement.accessibilityValue = [super accessibilityValue];
            baseElement.boundingRect = self.bounds;
            baseElement.superview = self;
            baseElement.accessibilityTraits = [super accessibilityTraits];

            [mutableAccessibilityItems addObject:baseElement];

            self.accessibilityElements = [NSArray arrayWithArray:mutableAccessibilityItems];
        }
    }

    return _accessibilityElements;
}

#pragma mark - UIView

- (CGSize)sizeThatFits:(CGSize)size {
    if (!self.attributedText) {
        return [super sizeThatFits:size];
    } else {
        NSAttributedString *string = [self renderedAttributedText];

        CGSize labelSize =
            formatCTFramesetterSuggestFrameSizeForAttributedStringWithConstraints([self framesetter], string, size, (NSUInteger)self.numberOfLines);
        labelSize.width += self.textInsets.left + self.textInsets.right;
        labelSize.height += self.textInsets.top + self.textInsets.bottom;

        return labelSize;
    }
}

- (CGSize)intrinsicContentSize {
    // There's an implicit width from the original UILabel implementation
    return [self sizeThatFits:[super intrinsicContentSize]];
}

- (void)tintColorDidChange {
    if (!self.inactiveLinkAttributes || [self.inactiveLinkAttributes count] == 0) {
        return;
    }

    BOOL isInactive = (self.tintAdjustmentMode == UIViewTintAdjustmentModeDimmed);

    NSMutableAttributedString *mutableAttributedString = [self.attributedText mutableCopy];
    for (TUIAttributedLabelLink *link in self.linkModels) {
        NSDictionary *attributesToRemove = isInactive ? link.attributes : link.inactiveAttributes;
        NSDictionary *attributesToAdd = isInactive ? link.inactiveAttributes : link.attributes;

        [attributesToRemove enumerateKeysAndObjectsUsingBlock:^(NSString *name, __unused id value, __unused BOOL *stop) {
          if (NSMaxRange(link.result.range) <= mutableAttributedString.length) {
              [mutableAttributedString removeAttribute:name range:link.result.range];
          }
        }];

        if (attributesToAdd) {
            if (NSMaxRange(link.result.range) <= mutableAttributedString.length) {
                [mutableAttributedString addAttributes:attributesToAdd range:link.result.range];
            }
        }
    }

    self.attributedText = mutableAttributedString;

    [self setNeedsDisplay];
}

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    if (![self linkAtPoint:point] || !self.userInteractionEnabled || self.hidden || self.alpha < 0.01) {
        return [super hitTest:point withEvent:event];
    }

    return self;
}

#pragma mark - UIResponder

- (BOOL)canBecomeFirstResponder {
    return YES;
}

- (BOOL)canPerformAction:(SEL)action withSender:(__unused id)sender {
#if !TARGET_OS_TV
    return (action == @selector(copy:));
#else
    return NO;
#endif
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];

    self.activeLink = [self linkAtPoint:[touch locationInView:self]];

    if (!self.activeLink) {
        [super touchesBegan:touches withEvent:event];
    }
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    if (self.activeLink) {
        UITouch *touch = [touches anyObject];

        if (self.activeLink != [self linkAtPoint:[touch locationInView:self]]) {
            self.activeLink = nil;
        }
    } else {
        [super touchesMoved:touches withEvent:event];
    }
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    if (self.activeLink) {
        if (self.activeLink.linkTapBlock) {
            self.activeLink.linkTapBlock(self, self.activeLink);
            self.activeLink = nil;
            return;
        }

        NSTextCheckingResult *result = self.activeLink.result;
        self.activeLink = nil;

        switch (result.resultType) {
            case NSTextCheckingTypeLink:
                if ([self.delegate respondsToSelector:@selector(attributedLabel:didSelectLinkWithURL:)]) {
                    [self.delegate attributedLabel:self didSelectLinkWithURL:result.URL];
                    return;
                }
                break;
            case NSTextCheckingTypeAddress:
                if ([self.delegate respondsToSelector:@selector(attributedLabel:didSelectLinkWithAddress:)]) {
                    [self.delegate attributedLabel:self didSelectLinkWithAddress:result.addressComponents];
                    return;
                }
                break;
            case NSTextCheckingTypePhoneNumber:
                if ([self.delegate respondsToSelector:@selector(attributedLabel:didSelectLinkWithPhoneNumber:)]) {
                    [self.delegate attributedLabel:self didSelectLinkWithPhoneNumber:result.phoneNumber];
                    return;
                }
                break;
            case NSTextCheckingTypeDate:
                if (result.timeZone && [self.delegate respondsToSelector:@selector(attributedLabel:didSelectLinkWithDate:timeZone:duration:)]) {
                    [self.delegate attributedLabel:self didSelectLinkWithDate:result.date timeZone:result.timeZone duration:result.duration];
                    return;
                } else if ([self.delegate respondsToSelector:@selector(attributedLabel:didSelectLinkWithDate:)]) {
                    [self.delegate attributedLabel:self didSelectLinkWithDate:result.date];
                    return;
                }
                break;
            case NSTextCheckingTypeTransitInformation:
                if ([self.delegate respondsToSelector:@selector(attributedLabel:didSelectLinkWithTransitInformation:)]) {
                    [self.delegate attributedLabel:self didSelectLinkWithTransitInformation:result.components];
                    return;
                }
            default:
                break;
        }

        // Fallback to `attributedLabel:didSelectLinkWithTextCheckingResult:` if no other delegate method matched.
        if ([self.delegate respondsToSelector:@selector(attributedLabel:didSelectLinkWithTextCheckingResult:)]) {
            [self.delegate attributedLabel:self didSelectLinkWithTextCheckingResult:result];
        }
    } else {
        [super touchesEnded:touches withEvent:event];
    }
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
    if (self.activeLink) {
        self.activeLink = nil;
    } else {
        [super touchesCancelled:touches withEvent:event];
    }
}

#pragma mark - UIGestureRecognizerDelegate

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    return [self containslinkAtPoint:[touch locationInView:self]];
}

#pragma mark - UILongPressGestureRecognizer

- (void)longPressGestureDidFire:(UILongPressGestureRecognizer *)sender {
    switch (sender.state) {
        case UIGestureRecognizerStateBegan: {
            CGPoint touchPoint = [sender locationInView:self];
            TUIAttributedLabelLink *link = [self linkAtPoint:touchPoint];

            if (link) {
                if (link.linkLongPressBlock) {
                    link.linkLongPressBlock(self, link);
                    return;
                }

                NSTextCheckingResult *result = link.result;

                if (!result) {
                    return;
                }

                switch (result.resultType) {
                    case NSTextCheckingTypeLink:
                        if ([self.delegate respondsToSelector:@selector(attributedLabel:didLongPressLinkWithURL:atPoint:)]) {
                            [self.delegate attributedLabel:self didLongPressLinkWithURL:result.URL atPoint:touchPoint];
                            return;
                        }
                        break;
                    case NSTextCheckingTypeAddress:
                        if ([self.delegate respondsToSelector:@selector(attributedLabel:didLongPressLinkWithAddress:atPoint:)]) {
                            [self.delegate attributedLabel:self didLongPressLinkWithAddress:result.addressComponents atPoint:touchPoint];
                            return;
                        }
                        break;
                    case NSTextCheckingTypePhoneNumber:
                        if ([self.delegate respondsToSelector:@selector(attributedLabel:didLongPressLinkWithPhoneNumber:atPoint:)]) {
                            [self.delegate attributedLabel:self didLongPressLinkWithPhoneNumber:result.phoneNumber atPoint:touchPoint];
                            return;
                        }
                        break;
                    case NSTextCheckingTypeDate:
                        if (result.timeZone && [self.delegate respondsToSelector:@selector(attributedLabel:
                                                                                     didLongPressLinkWithDate:timeZone:duration:atPoint:)]) {
                            [self.delegate attributedLabel:self
                                  didLongPressLinkWithDate:result.date
                                                  timeZone:result.timeZone
                                                  duration:result.duration
                                                   atPoint:touchPoint];
                            return;
                        } else if ([self.delegate respondsToSelector:@selector(attributedLabel:didLongPressLinkWithDate:atPoint:)]) {
                            [self.delegate attributedLabel:self didLongPressLinkWithDate:result.date atPoint:touchPoint];
                            return;
                        }
                        break;
                    case NSTextCheckingTypeTransitInformation:
                        if ([self.delegate respondsToSelector:@selector(attributedLabel:didLongPressLinkWithTransitInformation:atPoint:)]) {
                            [self.delegate attributedLabel:self didLongPressLinkWithTransitInformation:result.components atPoint:touchPoint];
                            return;
                        }
                    default:
                        break;
                }

                // Fallback to `attributedLabel:didLongPressLinkWithTextCheckingResult:atPoint:` if no other delegate method matched.
                if ([self.delegate respondsToSelector:@selector(attributedLabel:didLongPressLinkWithTextCheckingResult:atPoint:)]) {
                    [self.delegate attributedLabel:self didLongPressLinkWithTextCheckingResult:result atPoint:touchPoint];
                }
            }
            break;
        }
        default:
            break;
    }
}

#if !TARGET_OS_TV
#pragma mark - UIResponderStandardEditActions

- (void)copy:(__unused id)sender {
    [[UIPasteboard generalPasteboard] setString:self.text];
}
#endif

#pragma mark - NSCoding

- (void)encodeWithCoder:(NSCoder *)coder {
    [super encodeWithCoder:coder];

    [coder encodeObject:@(self.enabledTextCheckingTypes) forKey:NSStringFromSelector(@selector(enabledTextCheckingTypes))];

    [coder encodeObject:self.linkModels forKey:NSStringFromSelector(@selector(linkModels))];
    if ([NSMutableParagraphStyle class]) {
        [coder encodeObject:self.linkAttributes forKey:NSStringFromSelector(@selector(linkAttributes))];
        [coder encodeObject:self.activeLinkAttributes forKey:NSStringFromSelector(@selector(activeLinkAttributes))];
        [coder encodeObject:self.inactiveLinkAttributes forKey:NSStringFromSelector(@selector(inactiveLinkAttributes))];
    }
    [coder encodeObject:@(self.shadowRadius) forKey:NSStringFromSelector(@selector(shadowRadius))];
    [coder encodeObject:@(self.highlightedShadowRadius) forKey:NSStringFromSelector(@selector(highlightedShadowRadius))];
    [coder encodeCGSize:self.highlightedShadowOffset forKey:NSStringFromSelector(@selector(highlightedShadowOffset))];
    [coder encodeObject:self.highlightedShadowColor forKey:NSStringFromSelector(@selector(highlightedShadowColor))];
    [coder encodeObject:@(self.kern) forKey:NSStringFromSelector(@selector(kern))];
    [coder encodeObject:@(self.firstLineIndent) forKey:NSStringFromSelector(@selector(firstLineIndent))];
    [coder encodeObject:@(self.lineSpacing) forKey:NSStringFromSelector(@selector(lineSpacing))];
    [coder encodeObject:@(self.lineHeightMultiple) forKey:NSStringFromSelector(@selector(lineHeightMultiple))];
    [coder encodeUIEdgeInsets:self.textInsets forKey:NSStringFromSelector(@selector(textInsets))];
    [coder encodeInteger:self.verticalAlignment forKey:NSStringFromSelector(@selector(verticalAlignment))];

    [coder encodeObject:self.attributedTruncationToken forKey:NSStringFromSelector(@selector(attributedTruncationToken))];

    [coder encodeObject:NSStringFromUIEdgeInsets(self.linkBackgroundEdgeInset) forKey:NSStringFromSelector(@selector(linkBackgroundEdgeInset))];
    [coder encodeObject:self.attributedText forKey:NSStringFromSelector(@selector(attributedText))];
    [coder encodeObject:self.text forKey:NSStringFromSelector(@selector(text))];
}

- (id)initWithCoder:(NSCoder *)coder {
    self = [super initWithCoder:coder];
    if (!self) {
        return nil;
    }

    [self commonInit];

    if ([coder containsValueForKey:NSStringFromSelector(@selector(enabledTextCheckingTypes))]) {
        self.enabledTextCheckingTypes = [[coder decodeObjectForKey:NSStringFromSelector(@selector(enabledTextCheckingTypes))] unsignedLongLongValue];
    }

    if ([NSMutableParagraphStyle class]) {
        if ([coder containsValueForKey:NSStringFromSelector(@selector(linkAttributes))]) {
            self.linkAttributes = [coder decodeObjectForKey:NSStringFromSelector(@selector(linkAttributes))];
        }

        if ([coder containsValueForKey:NSStringFromSelector(@selector(activeLinkAttributes))]) {
            self.activeLinkAttributes = [coder decodeObjectForKey:NSStringFromSelector(@selector(activeLinkAttributes))];
        }

        if ([coder containsValueForKey:NSStringFromSelector(@selector(inactiveLinkAttributes))]) {
            self.inactiveLinkAttributes = [coder decodeObjectForKey:NSStringFromSelector(@selector(inactiveLinkAttributes))];
        }
    }

    if ([coder containsValueForKey:NSStringFromSelector(@selector(links))]) {
        NSArray *oldLinks = [coder decodeObjectForKey:NSStringFromSelector(@selector(links))];
        [self addLinksWithTextCheckingResults:oldLinks attributes:nil];
    }

    if ([coder containsValueForKey:NSStringFromSelector(@selector(linkModels))]) {
        self.linkModels = [coder decodeObjectForKey:NSStringFromSelector(@selector(linkModels))];
    }

    if ([coder containsValueForKey:NSStringFromSelector(@selector(shadowRadius))]) {
        self.shadowRadius = [[coder decodeObjectForKey:NSStringFromSelector(@selector(shadowRadius))] floatValue];
    }

    if ([coder containsValueForKey:NSStringFromSelector(@selector(highlightedShadowRadius))]) {
        self.highlightedShadowRadius = [[coder decodeObjectForKey:NSStringFromSelector(@selector(highlightedShadowRadius))] floatValue];
    }

    if ([coder containsValueForKey:NSStringFromSelector(@selector(highlightedShadowOffset))]) {
        self.highlightedShadowOffset = [coder decodeCGSizeForKey:NSStringFromSelector(@selector(highlightedShadowOffset))];
    }

    if ([coder containsValueForKey:NSStringFromSelector(@selector(highlightedShadowColor))]) {
        self.highlightedShadowColor = [coder decodeObjectForKey:NSStringFromSelector(@selector(highlightedShadowColor))];
    }

    if ([coder containsValueForKey:NSStringFromSelector(@selector(kern))]) {
        self.kern = [[coder decodeObjectForKey:NSStringFromSelector(@selector(kern))] floatValue];
    }

    if ([coder containsValueForKey:NSStringFromSelector(@selector(firstLineIndent))]) {
        self.firstLineIndent = [[coder decodeObjectForKey:NSStringFromSelector(@selector(firstLineIndent))] floatValue];
    }

    if ([coder containsValueForKey:NSStringFromSelector(@selector(lineSpacing))]) {
        self.lineSpacing = [[coder decodeObjectForKey:NSStringFromSelector(@selector(lineSpacing))] floatValue];
    }

    if ([coder containsValueForKey:NSStringFromSelector(@selector(minimumLineHeight))]) {
        self.minimumLineHeight = [[coder decodeObjectForKey:NSStringFromSelector(@selector(minimumLineHeight))] floatValue];
    }

    if ([coder containsValueForKey:NSStringFromSelector(@selector(maximumLineHeight))]) {
        self.maximumLineHeight = [[coder decodeObjectForKey:NSStringFromSelector(@selector(maximumLineHeight))] floatValue];
    }

    if ([coder containsValueForKey:NSStringFromSelector(@selector(lineHeightMultiple))]) {
        self.lineHeightMultiple = [[coder decodeObjectForKey:NSStringFromSelector(@selector(lineHeightMultiple))] floatValue];
    }

    if ([coder containsValueForKey:NSStringFromSelector(@selector(textInsets))]) {
        self.textInsets = [coder decodeUIEdgeInsetsForKey:NSStringFromSelector(@selector(textInsets))];
    }

    if ([coder containsValueForKey:NSStringFromSelector(@selector(verticalAlignment))]) {
        self.verticalAlignment = [coder decodeIntegerForKey:NSStringFromSelector(@selector(verticalAlignment))];
    }

    if ([coder containsValueForKey:NSStringFromSelector(@selector(attributedTruncationToken))]) {
        self.attributedTruncationToken = [coder decodeObjectForKey:NSStringFromSelector(@selector(attributedTruncationToken))];
    }

    if ([coder containsValueForKey:NSStringFromSelector(@selector(linkBackgroundEdgeInset))]) {
        self.linkBackgroundEdgeInset = UIEdgeInsetsFromString([coder decodeObjectForKey:NSStringFromSelector(@selector(linkBackgroundEdgeInset))]);
    }

    if ([coder containsValueForKey:NSStringFromSelector(@selector(attributedText))]) {
        self.attributedText = [coder decodeObjectForKey:NSStringFromSelector(@selector(attributedText))];
    } else {
        self.text = super.text;
    }

    return self;
}

@end

#pragma mark - TUIAttributedLabelLink

@implementation TUIAttributedLabelLink

- (instancetype)initWithAttributes:(NSDictionary *)attributes
                  activeAttributes:(NSDictionary *)activeAttributes
                inactiveAttributes:(NSDictionary *)inactiveAttributes
                textCheckingResult:(NSTextCheckingResult *)result {
    if ((self = [super init])) {
        _result = result;
        _attributes = [attributes copy];
        _activeAttributes = [activeAttributes copy];
        _inactiveAttributes = [inactiveAttributes copy];
    }

    return self;
}

- (instancetype)initWithAttributesFromLabel:(TUIAttributedLabel *)label textCheckingResult:(NSTextCheckingResult *)result {
    return [self initWithAttributes:label.linkAttributes
                   activeAttributes:label.activeLinkAttributes
                 inactiveAttributes:label.inactiveLinkAttributes
                 textCheckingResult:result];
}

#pragma mark - Accessibility

- (NSString *)accessibilityValue {
    if ([_accessibilityValue length] == 0) {
        switch (self.result.resultType) {
            case NSTextCheckingTypeLink:
                _accessibilityValue = self.result.URL.absoluteString;
                break;
            case NSTextCheckingTypePhoneNumber:
                _accessibilityValue = self.result.phoneNumber;
                break;
            case NSTextCheckingTypeDate:
                _accessibilityValue = [NSDateFormatter localizedStringFromDate:self.result.date
                                                                     dateStyle:NSDateFormatterLongStyle
                                                                     timeStyle:NSDateFormatterLongStyle];
                break;
            default:
                break;
        }
    }

    return _accessibilityValue;
}

#pragma mark - NSCoding

- (void)encodeWithCoder:(NSCoder *)aCoder {
    [aCoder encodeObject:self.result forKey:NSStringFromSelector(@selector(result))];
    [aCoder encodeObject:self.attributes forKey:NSStringFromSelector(@selector(attributes))];
    [aCoder encodeObject:self.activeAttributes forKey:NSStringFromSelector(@selector(activeAttributes))];
    [aCoder encodeObject:self.inactiveAttributes forKey:NSStringFromSelector(@selector(inactiveAttributes))];
    [aCoder encodeObject:self.accessibilityValue forKey:NSStringFromSelector(@selector(accessibilityValue))];
}

- (id)initWithCoder:(NSCoder *)aDecoder {
    if ((self = [super init])) {
        _result = [aDecoder decodeObjectForKey:NSStringFromSelector(@selector(result))];
        _attributes = [aDecoder decodeObjectForKey:NSStringFromSelector(@selector(attributes))];
        _activeAttributes = [aDecoder decodeObjectForKey:NSStringFromSelector(@selector(activeAttributes))];
        _inactiveAttributes = [aDecoder decodeObjectForKey:NSStringFromSelector(@selector(inactiveAttributes))];
        self.accessibilityValue = [aDecoder decodeObjectForKey:NSStringFromSelector(@selector(accessibilityValue))];
    }

    return self;
}

@end

#pragma mark -

static inline CGColorRef formatCGColorRefFromColor(id color) { return [color isKindOfClass:[UIColor class]] ? [color CGColor] : (__bridge CGColorRef)color; }

static inline CTFontRef formatCTFontRefFromUIFont(UIFont *font) {
    CTFontRef ctfont = CTFontCreateWithName((__bridge CFStringRef)font.fontName, font.pointSize, NULL);
    return CFAutorelease(ctfont);
}

static inline NSDictionary *convertNSAttributedStringAttributesToCTAttributes(NSDictionary *attributes) {
    if (!attributes) return nil;

    NSMutableDictionary *mutableAttributes = [NSMutableDictionary dictionary];

    NSDictionary *convertMap = @{
        NSFontAttributeName : (NSString *)kCTFontAttributeName,
        NSBackgroundColorAttributeName : (NSString *)kTUIBackgroundFillColorAttributeName,
        NSForegroundColorAttributeName : (NSString *)kCTForegroundColorAttributeName,
        NSUnderlineColorAttributeName : (NSString *)kCTUnderlineColorAttributeName,
        NSUnderlineStyleAttributeName : (NSString *)kCTUnderlineStyleAttributeName,
        NSStrokeWidthAttributeName : (NSString *)kCTStrokeWidthAttributeName,
        NSStrokeColorAttributeName : (NSString *)kCTStrokeWidthAttributeName,
        NSKernAttributeName : (NSString *)kCTKernAttributeName,
        NSLigatureAttributeName : (NSString *)kCTLigatureAttributeName
    };

    [attributes enumerateKeysAndObjectsUsingBlock:^(id key, id value, BOOL *stop) {
      key = [convertMap objectForKey:key] ?: key;

      if (![NSMutableParagraphStyle class]) {
          if ([value isKindOfClass:[UIFont class]]) {
              value = (__bridge id)formatCTFontRefFromUIFont(value);
          } else if ([value isKindOfClass:[UIColor class]]) {
              value = (__bridge id)((UIColor *)value).CGColor;
          }
      }

      [mutableAttributes setObject:value forKey:key];
    }];

    return [NSDictionary dictionaryWithDictionary:mutableAttributes];
}