Swift实现上下弹跳动画

先看下我一开始傻傻的实现~~~

func addAnimation(isAnimation: Bool = true) {
    UIView.animate(withDuration: 0.5, animations: {
        self.cartBtn1.frame = CGRect(x: self.cartBtn1.frame.origin.x, y: self.cartBtn1.frame.origin.y + 30, width: 36, height: 36)
    }, completion: nil)
    UIView.animate(withDuration: 0.8, delay: 0.5, usingSpringWithDamping: 0.9, initialSpringVelocity: 0, options: .curveEaseInOut, animations: {
        self.cartBtn1.frame = CGRect(x: self.cartBtn1.frame.origin.x, y: self.cartBtn1.frame.origin.y - 30, width: 36, height: 36)
    }) { (finish) in
        self.addAnimation()
    }
}

效果也能实现，问题在哪呢？就是没法取消动画。。。。。。原谅我不知道怎么取消，因为使用递归动画了。

正确实现如下：

func addUpAndDownAnimation() {
    let animatioan = CABasicAnimation(keyPath: "transform.translation.y")
    animatioan.isRemovedOnCompletion = false
    animatioan.duration = 0.8
    animatioan.autoreverses = true
    animatioan.repeatCount = MAXFLOAT
    animatioan.fromValue = NSNumber(value: 0)
    animatioan.toValue = NSNumber(value: 50)
    cartBtn1.layer.add(animatioan, forKey: "bounce")
}

取消动画：

self.cartBtn1.layer.removeAllAnimations()

参考链接：

用 Swift 语言写一个地图坐标弹跳动画：

https://www.cnblogs.com/missingcat92/p/4662863.html