UIButton Heartbeat动画

Question

我为UIButton创建了心跳动画。但是，没有办法停止这个动画，因为它是一个无限的代码循环。在修补了许多UIView动画代码块后，我无法让UIViewAnimationOptions.Repeat生成我需要的东西。如果我能做到这一点，我可以简单地button.layer.removeAllAnimations()删除动画。什么是写这个允许删除动画的方法？我可能会想一个计时器，但这可能会让多个动画变得混乱。

func heartBeatAnimation(button: UIButton) {

    button.userInteractionEnabled = true
    button.enabled = true

    func animation1() {

        UIView.animateWithDuration(0.5, delay: 0.0, options: [], animations: { () -> Void in

            button.transform = CGAffineTransformMakeScale(2.0, 2.0)
            button.transform = CGAffineTransformIdentity

        }, completion: nil)

        UIView.animateWithDuration(0.5, delay: 0.5, options: [], animations: { () -> Void in

            button.transform = CGAffineTransformMakeScale(2.0, 2.0)
            button.transform = CGAffineTransformIdentity

            }) { (Bool) -> Void in

                delay(2.0, closure: { () -> () in

                    animation2()

                })       
        }
    }

    func animation2() {

        UIView.animateWithDuration(0.5, delay: 0.0, options: [], animations: { () -> Void in

            button.transform = CGAffineTransformMakeScale(2.0, 2.0)
            button.transform = CGAffineTransformIdentity

            }, completion: nil)

        UIView.animateWithDuration(0.5, delay: 0.5, options: [], animations: { () -> Void in

            button.transform = CGAffineTransformMakeScale(2.0, 2.0)
            button.transform = CGAffineTransformIdentity

            }) { (Bool) -> Void in

                delay(2.0, closure: { () -> () in

                    animation1()

                })
        }
    }

    animation1()

}

Answer 1

这完美无缺。阻尼和弹簧需要稍微调整一下，但这解决了这个问题。 removeAllAnimations()清除动画并将按钮返回到正常状态。

button.userInteractionEnabled = true
button.enabled = true

let pulse1 = CASpringAnimation(keyPath: "transform.scale")
pulse1.duration = 0.6
pulse1.fromValue = 1.0
pulse1.toValue = 1.12
pulse1.autoreverses = true
pulse1.repeatCount = 1
pulse1.initialVelocity = 0.5
pulse1.damping = 0.8

let animationGroup = CAAnimationGroup()
animationGroup.duration = 2.7
animationGroup.repeatCount = 1000
animationGroup.animations = [pulse1]

button.layer.addAnimation(animationGroup, forKey: "pulse")

这篇文章非常有用：CAKeyframeAnimation delay before repeating

Answer 2

Swift 5代码，在脉冲之间没有停顿的情况下工作：

    let pulse = CASpringAnimation(keyPath: "transform.scale")
    pulse.duration = 0.4
    pulse.fromValue = 1.0
    pulse.toValue = 1.12
    pulse.autoreverses = true
    pulse.repeatCount = .infinity
    pulse.initialVelocity = 0.5
    pulse.damping = 0.8
    switchButton.layer.add(pulse, forKey: nil)

Answer 3

我创造了这样的东西：

    let animation = CAKeyframeAnimation(keyPath: "transform.scale")

    animation.values = [1.0, 1.2, 1.0]
    animation.keyTimes = [0, 0.5, 1]
    animation.duration = 1.0
    animation.repeatCount = Float.infinity
    layer.add(animation, forKey: "pulse")

Answer 4

在原始问题上，您提到过您希望动画停止命令。我想你也希望它也能从命令开始。这个解决方案可以做到这两点，而且很简单。

grep

如果需要，可以在任意位置调用cutAnim（）来停止动画，在计时器内。

要启动动画，请使用常规按钮操作

grep -l 'str1' * | head

希望这会有所帮助。