ios - Swift 中 UIImageView 的无限摇动动画

Question

我正在尝试让 UIImageView 无限期地摇动。

        var coffeeImageView = UIImageView(image: UIImage(named: "coffee.png"))
        coffeeImageView.frame = CGRectMake(100, self.view.frame.size.height - 100, 50, 50)
        self.view.addSubview(coffeeImageView)

        let coffeeShakeAnimation = CABasicAnimation(keyPath: "transform")
        coffeeShakeAnimation.duration = 0.07
        coffeeShakeAnimation.repeatCount = 20
        coffeeShakeAnimation.autoreverses = true
        coffeeShakeAnimation.fromValue = NSValue(CGPoint: CGPointMake(coffeeImageView.center.x - 10, coffeeImageView.center.y))
        coffeeShakeAnimation.toValue = NSValue(CGPoint: CGPointMake(coffeeImageView.center.x + 10, coffeeImageView.center.y))
        coffeeImageView.layer.addAnimation(coffeeShakeAnimation, forKey: "position")

Answer 1

替换

let coffeeShakeAnimation = CABasicAnimation(keyPath: "transform")

由

let coffeeShakeAnimation = CABasicAnimation(keyPath: "position")

会摇晃