对字符串Swift中的单个字符进行动画处理

import UIKit

func animateString(string: String, duration: TimeInterval, distance: CGFloat) {
    let characters = Array(string)
    let textLayer = CATextLayer()
    textLayer.string = string
    textLayer.fontSize = 20
    textLayer.frame = CGRect(x: 0, y: 0, width: CGFloat(characters.count) * distance, height: 30)
    
    for (index, character) in characters.enumerated() {
        let animation = CABasicAnimation(keyPath: "position.x")
        animation.fromValue = textLayer.position.x + CGFloat(index) * distance
        animation.toValue = textLayer.position.x + CGFloat(index) * distance + distance
        animation.duration = duration
        animation.beginTime = CACurrentMediaTime() + Double(index) * duration
        
        let characterLayer = CATextLayer()
        characterLayer.string = String(character)
        characterLayer.fontSize = 20
        characterLayer.frame = CGRect(x: CGFloat(index) * distance, y: 0, width: distance, height: 30)
        characterLayer.add(animation, forKey: "position")
        
        textLayer.addSublayer(characterLayer)
    }
    
    let animationView = UIView(frame: textLayer.frame)
    animationView.layer.addSublayer(textLayer)
    
    // 将animationView添加到视图层级中显示动画效果
    // ...
}

// 调用示例
animateString(string: "Hello", duration: 0.5, distance: 30)