Swift 中同一 UIView 的多个动画

Question

我正在尝试为我的图像视图添加多个动画，但其中只有一个是动画的。请检查以下代码。我为我的图像视图创建了缩放和旋转动画，但只有在运行以下代码时我才能看到缩放动画。

//Rotate animation
let rotation: CABasicAnimation = CABasicAnimation(keyPath: 
"transform.rotation.y")
rotation.toValue = 0
rotation.fromValue = 2.61

//Scale animation
let scale: CABasicAnimation = CABasicAnimation(keyPath: "transform.scale")
scale.toValue = 1
scale.fromValue = 0

//Adding animations to group
let group = CAAnimationGroup()
group.animations = [rotation,scale]
group.duration = 0.2

myImage.layer.add(group, forKey: nil) 

Answer 1

轮换发生，但持续时间较少

group.duration = 0.2

当改为 5 秒时见

Answer 2

在你的完成中，你可以放置你的动画，当完成一个，等待第二个......等等

   let myImage = UIImageView()
    UIView.animate(withDuration: 1.0, animations: {
        let rotation: CABasicAnimation = CABasicAnimation(keyPath: 
        "transform.rotation.y")
        rotation.toValue = 0
        rotation.fromValue = 2.61
    }, completion: { (value: Bool) in
        UIView.animate(withDuration: 1.0, animations: {
            //you can here put your other animation
        })
    })