在swift3中组合平移、alpha和缩放动画

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var animatedView: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // 初始化动画
        let translateAnimation = CABasicAnimation(keyPath: "position")
        translateAnimation.fromValue = NSValue(cgPoint: animatedView.center)
        translateAnimation.toValue = NSValue(cgPoint: CGPoint(x: animatedView.center.x + 100, y: animatedView.center.y))

        let alphaAnimation = CABasicAnimation(keyPath: "opacity")
        alphaAnimation.fromValue = 1.0
        alphaAnimation.toValue = 0.5

        let scaleAnimation = CABasicAnimation(keyPath: "transform.scale")
        scaleAnimation.fromValue = 1.0
        scaleAnimation.toValue = 1.5

        // 创建动画组
        let animationGroup = CAAnimationGroup()
        animationGroup.animations = [translateAnimation, alphaAnimation, scaleAnimation]
        animationGroup.duration = 2.0 // 动画持续时间
        animationGroup.repeatCount = .infinity // 无限重复
        animationGroup.autoreverses = true // 动画结束后反向执行

        // 将动画添加到视图
        animatedView.layer.add(animationGroup, forKey: "groupAnimation")

        // 保持动画结束后的状态
        animatedView.layer.position = CGPoint(x: animatedView.center.x + 100, y: animatedView.center.y)
        animatedView.layer.opacity = 0.5
        animatedView.layer.transform = CATransform3DMakeScale(1.5, 1.5, 1.5)
    }
}