ios - 如何在 UIButton 上制作原生 "Pulse effect"动画 - iOS

Question

我想在 UIButton 上制作某种脉冲动画(无限循环“缩小 - 缩小”)，以便立即引起用户的注意。

我看到了这个链接 How to create a pulse effect using -webkit-animation - outward rings但我想知道是否有任何方法可以仅使用 native 框架来做到这一点？

Answer 1

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: CAMediaTimingFunctionName.easeInEaseOut)
pulseAnimation.autoreverses = true
pulseAnimation.repeatCount = .greatestFiniteMagnitude
view.layer.add(pulseAnimation, forKey: "animateOpacity")

See the article "Animating Layer Content"