Lanu_iOS/Lanu/Common/Views/Base/LNViewController.swift

//
//  LNViewController.swift
//  Lanu
//
//  Created by OneeChan on 2025/11/6.
//

import Foundation
import UIKit


class LNViewController: UIViewController {
    var showNavigationBar = true
    var enableDragBack = true
    var navigationBarColor: UIColor = .white
    var customBack: (() -> Void)?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        view.backgroundColor = .white
        edgesForExtendedLayout = []
//        hidesBottomBarWhenPushed = true
        
        let button = UIButton(type: .system)
        let buttonImage: UIImage? = .init(systemName: "chevron.backward")?.withRenderingMode(.alwaysTemplate)
        button.contentHorizontalAlignment = .center
        button.setImage(buttonImage, for: .normal)
        button.tintColor = .black
        button.addAction(UIAction(handler: { [weak self] _ in
            guard let self else { return }
            if let customBack {
                customBack()
            } else {
                navigationController?.popViewController(animated: true)
            }
        }), for: .touchUpInside)
        navigationItem.leftBarButtonItem = UIBarButtonItem(customView: button)
    }
    
    func setRightButton(_ view: UIView?) {
        if let view {
            navigationItem.rightBarButtonItem = UIBarButtonItem(customView: view)
        } else {
            navigationItem.rightBarButtonItem = nil
        }
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        navigationController?.setNavigationBarHidden(!showNavigationBar, animated: animated)
        
        if showNavigationBar,
           let navBar = navigationController?.navigationBar {
            // 1. 配置外观（iOS 15+ 必须用 UINavigationBarAppearance）
            let appearance = UINavigationBarAppearance()
            appearance.backgroundColor = navigationBarColor // 导航栏背景色
            appearance.shadowColor = .clear // 去除底部阴影线
            if navigationBarColor == .clear {
                appearance.configureWithTransparentBackground()
            }
            
            // 2. 应用外观设置（iOS 15+ 需要设置 scrollEdgeAppearance 和 standardAppearance）
            navBar.scrollEdgeAppearance = appearance // 滚动到顶部时的外观（如列表顶部）
            navBar.standardAppearance = appearance   // 常规状态的外观
            navBar.compactAppearance = appearance
        }
    }
}