MiMO_iOS/MiMoLive/Classes/Base/MOGradientLabel.swift

//
//  MOGradientLabel.swift
//  MiMoLive
//
//  Created by OneeChan on 2025/9/25.
//

import Foundation
import UIKit

class MOGradientLabel: UILabel {
    private let gradientLayer = CAGradientLayer()
    var gradientColors: [UIColor] = [.red, .blue]
    var startPoint: CGPoint = .init(x: 0, y: 0.5)
    var endPoint: CGPoint = .init(x: 1, y: 0.5)
    
}

extension MOGradientLabel {
    override func layoutSubviews() {
        super.layoutSubviews()
        
        applyGradient()
    }
    
    private func applyGradient() {
        gradientLayer.colors = gradientColors.map { $0.cgColor }
        gradientLayer.startPoint = startPoint
        gradientLayer.endPoint = endPoint
        gradientLayer.frame = bounds
        
        // 创建文字遮罩
        let textMask = CALayer()
        textMask.contents = UIGraphicsImageRenderer(size: bounds.size).image { _ in
            text?.draw(in: bounds, withAttributes: [
                .font: font ?? UIFont.systemFont(ofSize: 17),
                .foregroundColor: textColor ?? .white
            ])
        }.cgImage
        textMask.frame = bounds
        
        // 将文字遮罩应用到渐变层
        gradientLayer.mask = textMask
        if gradientLayer.superlayer == nil {
            layer.insertSublayer(gradientLayer, at: 0)
        }
    }
}


//import SwiftUI
//
//struct MOGradientLabelPreview: UIViewRepresentable {
//    func makeUIView(context: Context) -> some UIView {
//        let view = UIView()
//        let testView = MOGradientLabel()
//        testView.text = "This is a test"
//        view.addSubview(testView)
//        testView.snp.makeConstraints { make in
//            make.leading.centerY.equalToSuperview()
//        }
//        return view
//    }
//
//    func updateUIView(_ uiView: UIViewType, context: Context) {
//
//    }
//}
//
//#Preview {
//    MOGradientLabelPreview()
//}