我希望在 UIButton 上有某种脉冲动画（无限循环“缩小 - 缩小”），以便它立即引起用户的注意。
我看到了这个链接如何使用-webkit-animation - 向外环创建脉冲效果 https://stackoverflow.com/questions/4910963/how-to-create-a-pulse-effect-using-web-kit-animation-outward-rings但我想知道是否有什么方法可以仅使用本机框架来做到这一点？
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")
请参阅文章“动画图层内容” https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/CoreAnimation_guide/CreatingBasicAnimations/CreatingBasicAnimations.html#//apple_ref/doc/uid/TP40004514-CH3-SW1
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