2026-03-31

import UIKit
import Lottie

extension UIImage {
/// 【终极】Lottie JSON 文件名 → 生成 TabBar 图标（24x24，必显示）
static func fromLottie(
name: String,
size: CGSize = CGSize(width: 24, height: 24),
progress: CGFloat = 0
) -> UIImage? {

    // 1. 加载 Lottie
    let animation = LottieAnimation.named(name)
    let animationView = LottieAnimationView(animation: animation)
    
    // 2. 必须设置大小 + 布局
    animationView.frame = CGRect(origin: .zero, size: size)
    animationView.backgroundColor = .clear
    animationView.contentMode = .scaleAspectFit
    animationView.currentProgress = progress
    
    // 3. 关键：临时加到 keyWindow 让它渲染（否则不显示）
    if let window = UIApplication.shared.connectedScenes
        .filter({ $0.activationState == .foregroundActive })
        .compactMap({ $0 as? UIWindowScene })
        .first?.windows.first {
        
        window.addSubview(animationView)
        animationView.layoutIfNeeded()
        
        // 4. 渲染图片
        let renderer = UIGraphicsImageRenderer(size: size)
        let image = renderer.image { ctx in
            animationView.drawHierarchy(in: animationView.bounds, afterScreenUpdates: true)
        }
        
        // 5. 用完移除
        animationView.removeFromSuperview()
        
        return image.withRenderingMode(.alwaysOriginal)
    }
    
    return nil
}

}