如何在Swift中重复链式动画？

import UIKit

// 创建第一个动画
let animation1 = CABasicAnimation(keyPath: "position")
animation1.fromValue = NSValue(cgPoint: CGPoint(x: 0, y: 0))
animation1.toValue = NSValue(cgPoint: CGPoint(x: 100, y: 100))
animation1.duration = 1

// 创建第二个动画
let animation2 = CABasicAnimation(keyPath: "transform.rotation")
animation2.fromValue = 0
animation2.toValue = CGFloat.pi
animation2.duration = 1

// 创建动画组并添加动画
let animationGroup = CAAnimationGroup()
animationGroup.animations = [animation1, animation2]

// 设置动画重复次数
CATransaction.begin()
CATransaction.setAnimationRepeatCount(3)
CATransaction.setCompletionBlock {
    print("Animation completed")
}
    
// 添加动画到图层
let layer = CALayer()
layer.bounds = CGRect(x: 0, y: 0, width: 100, height: 100)
layer.position = CGPoint(x: 50, y: 50)
layer.backgroundColor = UIColor.red.cgColor
layer.add(animationGroup, forKey: "animation")

CATransaction.commit()