ios 如何延迟 CABasicAnimation？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/15116712/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to delay a CABasicAnimation?
提问by openfrog
I have a CABasicAnimationand want to start it after a delay. In UIKit I can specify delays. The CAMediaTimingprotocol has a timeOffsetproperty but I can't see an effect. My next try is to use GCD to delay it but it feels like overkill.
我有一个CABasicAnimation并想在延迟后启动它。在 UIKit 中，我可以指定延迟。该CAMediaTiming协议有一个timeOffset属性，但我看不到效果。我的下一个尝试是使用 GCD 来延迟它，但感觉有点矫枉过正。
回答by trojanfoe
Shouldn't you be using the [CAMediaTiming beginTime]property (reference)?
您不应该使用该[CAMediaTiming beginTime]属性（参考）吗？
See Customizing the Timing of an Animationin the Core Animation Programming Guide.
请参阅核心动画编程指南中的自定义动画时间。
CABasicAnimation *animation;
animation.beginTime = CACurrentMediaTime() + 0.3; //0.3 seconds delay
回答by Dave G
In Swift 3.0:
在 Swift 3.0 中：
func animateYourView () {
let myDelay = 5.0
let scalePulseAnimation: CABasicAnimation = CABasicAnimation(keyPath: "transform.scale")
scalePulseAnimation.beginTime = CACurrentMediaTime() + myDelay
scalePulseAnimation.duration = 0.5
scalePulseAnimation.repeatCount = 2.0
scalePulseAnimation.autoreverses = true
scalePulseAnimation.fromValue = 1.0
scalePulseAnimation.toValue = 0.5
myView.layer.add(scalePulseAnimation, forKey: "scale")
}
Where the key line for the delay is:
延迟的关键在于：
scalePulseAnimation.beginTime = CACurrentMediaTime() + myDelay
