ios - 如何做一个原生的“脉冲效应” UIButton上的动画 [英] ios - how to do a native "Pulse effect" animation on a UIButton

问题描述

我想在UIButton上有一些脉冲动画（无限循环缩小比例尺），以便立即引起用户注意。

I would like to have some kind of pulse animation (infinite loop "scale in - scale out") on a UIButton so it gets users' attention immediately.

我看到了这个链接如何创建一个脉冲效果使用-webkit-animation - 外向环但我想知道是否有任何方法只使用本机框架？

I saw this link How to create a pulse effect using -webkit-animation - outward rings but I was wondering if there was any way to do this only using native framework?

任何帮助非常感谢 - 代码示例甚至更好; - ）

Any help much appreciated - code sample even better ;-)

推荐答案

CABasicAnimation *theAnimation;

theAnimation=[CABasicAnimation animationWithKeyPath:@"opacity"];
theAnimation.duration=1.0;
theAnimation.repeatCount=HUGE_VALF;
theAnimation.autoreverses=YES;
theAnimation.fromValue=[NSNumber numberWithFloat:1.0];
theAnimation.toValue=[NSNumber numberWithFloat:0.0];
[theLayer addAnimation:theAnimation forKey:@"animateOpacity"]; //myButton.layer instead of

Swift

let pulseAnimation = CABasicAnimation(keyPath: #keyPath(CALayer.opacity))
pulseAnimation.duration = 1
pulseAnimation.fromValue = 0
pulseAnimation.toValue = 1
pulseAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
pulseAnimation.autoreverses = true
pulseAnimation.repeatCount = .greatestFiniteMagnitude
self.view.layer.addAnimation(pulseAnimation, forKey: "animateOpacity")

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