iOS在UIView上闪烁动画的次数有限

Question

我试图在UIView上创建一个闪烁的效果。当前，我正在使用使UIView无限次闪烁的代码。代码看起来像这样

到目前为止，我已经做了什么:

 func startBlink() {
                  UIView.animate(withDuration: 0.8,//Time duration
                                delay:0.0,
                                options:[.allowUserInteraction, .curveEaseInOut, .autoreverse, .repeat],
                                animations: { self.alpha = 0 },
                                completion: nil)
        }

但是此代码使ui View 闪烁了无数次。我使用了另一个代码，但仅闪烁了一次。

我想要的:

So I am pretty close but I really want to blink the UIView for finite number of times i.e 30 times, and it must stop after 30th blink.

请对此提供帮助，我想我的问题很清楚。请帮帮我。

Answer 1

使用此功能可以为“ View ”制作动画。希望对您有所帮助

extension UIView {  
        func flash(numberOfFlashes: Float) {
           let flash = CABasicAnimation(keyPath: "opacity")
           flash.duration = 0.2
           flash.fromValue = 1
           flash.toValue = 0.1
           flash.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
           flash.autoreverses = true
           flash.repeatCount = numberOfFlashes
           layer.add(flash, forKey: nil)
       }
 }