在Swift中为UITextField/UIView摇动动画

Question

我试图弄清楚当用户将文本字段留空时如何在按钮按下时使文本摇动.

我目前有以下代码工作:

if self.subTotalAmountData.text == "" {

    let alertController = UIAlertController(title: "Title", message:
        "What is the Sub-Total!", preferredStyle: UIAlertControllerStyle.Alert)
    alertController.addAction(UIAlertAction(title: "Okay", style: UIAlertActionStyle.Default,handler: nil))

    self.presentViewController(alertController, animated: true, completion: nil)

} else {

}

但我认为将文本字段震动作为警报会更具吸引力.

我找不到任何动画文本字段的动画.

有任何想法吗？

谢谢!

Answer 1

您可以更改duration和repeatCount并调整它.这就是我在代码中使用的内容.改变fromValue并toValue改变摇动中移动的距离.

let animation = CABasicAnimation(keyPath: "position")
animation.duration = 0.07
animation.repeatCount = 4
animation.autoreverses = true
animation.fromValue = NSValue(cgPoint: CGPoint(x: viewToShake.center.x - 10, y: viewToShake.center.y))
animation.toValue = NSValue(cgPoint: CGPoint(x: viewToShake.center.x + 10, y: viewToShake.center.y))

viewToShake.layer.add(animation, forKey: "position")

Answer 2

以下功能在任何视图中使用.

extension UIView {
    func shake() {
        let animation = CAKeyframeAnimation(keyPath: "transform.translation.x")
        animation.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.linear)
        animation.duration = 0.6
        animation.values = [-20.0, 20.0, -20.0, 20.0, -10.0, 10.0, -5.0, 5.0, 0.0 ]
        layer.add(animation, forKey: "shake")
    }
}

Answer 3

或者,如果你想要更多参数,你可以使用它(在swift 3和swift 4中):

public extension UIView {

    func shake(count : Float = 4,for duration : TimeInterval = 0.5,withTranslation translation : Float = 5) {

        let animation = CAKeyframeAnimation(keyPath: "transform.translation.x")
        animation.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.linear)
        animation.repeatCount = count
        animation.duration = duration/TimeInterval(animation.repeatCount)
        animation.autoreverses = true
        animation.values = [translation, -translation]
        layer.add(animation, forKey: "shake")
    }  
}

你可以在任何UIView,UIButton,UILabel,UITextView等上调用这个函数.这样

yourView.shake()

或者这样,如果要为动画添加一些自定义参数:

yourView.shake(count: 5, for: 1.5, withTranslation: 10)

Answer 4

我认为所有这些都很危险.

如果您的摇动动画基于用户操作,并且在动画制作时触发了用户操作.

CRAAAAAASH

这是我在Swift 4中的方式:

static func shake(view: UIView, for duration: TimeInterval = 0.5, withTranslation translation: CGFloat = 10) {
    let propertyAnimator = UIViewPropertyAnimator(duration: duration, dampingRatio: 0.3) {
        view.transform = CGAffineTransform(translationX: translation, y: 0)
    }

    propertyAnimator.addAnimations({
        view.transform = CGAffineTransform(translationX: 0, y: 0)
    }, delayFactor: 0.2)

    propertyAnimator.startAnimation()
}

也许不是最干净的,但这种方法可以反复触发,很容易理解

编辑:

我是使用UIViewPropertyAnimator的巨大支持者.这么多很酷的功能允许您对基本动画进行动态修改.

这是另一个在视图抖动时添加红色边框的示例,然后在抖动完成时将其删除.

static func shake(view: UIView, for duration: TimeInterval = 0.5, withTranslation translation: CGFloat = 10) {
    let propertyAnimator = UIViewPropertyAnimator(duration: duration, dampingRatio: 0.3) {
        view.layer.borderColor = UIColor.red.cgColor
        view.layer.borderWidth = 1
        view.transform = CGAffineTransform(translationX: translation, y: 0)
    }

    propertyAnimator.addAnimations({
        view.transform = CGAffineTransform(translationX: 0, y: 0)
    }, delayFactor: 0.2)

    propertyAnimator.addCompletion { (_) in
        view.layer.borderWidth = 0
    }

    propertyAnimator.startAnimation()
}

Answer 5

Swift 3.0

extension UIView {
    func shake(){
        let animation = CABasicAnimation(keyPath: "position")
        animation.duration = 0.07
        animation.repeatCount = 3
        animation.autoreverses = true
        animation.fromValue = NSValue(cgPoint: CGPoint(x: self.center.x - 10, y: self.center.y))
        animation.toValue = NSValue(cgPoint: CGPoint(x: self.center.x + 10, y: self.center.y))
        self.layer.add(animation, forKey: "position")
    }
}

使用

self.vwOffer.shake()

Answer 6

雨燕5

安全（非崩溃）摇动扩展以获得Corey Pett答案：

extension UIView {
    func shake(for duration: TimeInterval = 0.5, withTranslation translation: CGFloat = 10) {
        let propertyAnimator = UIViewPropertyAnimator(duration: duration, dampingRatio: 0.3) {
            self.transform = CGAffineTransform(translationX: translation, y: 0)
        }

        propertyAnimator.addAnimations({
            self.transform = CGAffineTransform(translationX: 0, y: 0)
        }, delayFactor: 0.2)

        propertyAnimator.startAnimation()
    }
}

Answer 7

extension CALayer {

    func shake(duration: NSTimeInterval = NSTimeInterval(0.5)) {

        let animationKey = "shake"
        removeAnimationForKey(animationKey)

        let kAnimation = CAKeyframeAnimation(keyPath: "transform.translation.x")
        kAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionLinear)
        kAnimation.duration = duration

        var needOffset = CGRectGetWidth(frame) * 0.15,
        values = [CGFloat]()

        let minOffset = needOffset * 0.1

        repeat {

            values.append(-needOffset)
            values.append(needOffset)
            needOffset *= 0.5
        } while needOffset > minOffset

        values.append(0)
        kAnimation.values = values
        addAnimation(kAnimation, forKey: animationKey)
    }
}

如何使用：

[UIView, UILabel, UITextField, UIButton & etc].layer.shake(NSTimeInterval(0.7))

Answer 8

我尝试了一些可用的解决方案，但没有一个能够处理完整的摇动动画：从左到右移动并返回到原始位置。

因此，经过一番调查，我找到了正确的解决方案，我认为使用UIViewPropertyAnimator.

func shake(completion: (() -> Void)? = nil) {
    let speed = 0.75
    let time = 1.0 * speed - 0.15
    let timeFactor = CGFloat(time / 4)
    let animationDelays = [timeFactor, timeFactor * 2, timeFactor * 3]

    let shakeAnimator = UIViewPropertyAnimator(duration: time, dampingRatio: 0.3)
    // left, right, left, center
    shakeAnimator.addAnimations({
        self.transform = CGAffineTransform(translationX: 20, y: 0)
    })
    shakeAnimator.addAnimations({
        self.transform = CGAffineTransform(translationX: -20, y: 0)
    }, delayFactor: animationDelays[0])
    shakeAnimator.addAnimations({
        self.transform = CGAffineTransform(translationX: 20, y: 0)
    }, delayFactor: animationDelays[1])
    shakeAnimator.addAnimations({
        self.transform = CGAffineTransform(translationX: 0, y: 0)
    }, delayFactor: animationDelays[2])
    shakeAnimator.startAnimation()

    shakeAnimator.addCompletion { _ in
        completion?()
    }

    shakeAnimator.startAnimation()
}

最后结果：