如何使用iPhone UIImageView链接缩放动画？

import UIKit

let imageView = UIImageView(image: UIImage(named: "your_image_name"))

imageView.frame = CGRect(x: 0, y: 0, width: 100, height: 100)

view.addSubview(imageView)

let animation = CABasicAnimation(keyPath: "transform.scale")
animation.fromValue = 1.0
animation.toValue = 1.5
animation.duration = 1.0
animation.repeatCount = Float.infinity
animation.autoreverses = true

imageView.layer.add(animation, forKey: "scale")