SKBounceAnimation CAKeyframeAnimation子类，可让您快速轻松地设置反弹次数、开始和结束值，并...

SKBounce动画SKBounceAnimation是一个CAKeyframeAnimation子类，它根据开始和结束值以及反弹次数为您创建动画。它基于这篇的数学和技术：而这又部分基于Matt Gallagher的工作： 。用法基本代码很简单： NSString *keyPath = @"position.y"; id finalValue = [NSNumber numberWithFloat:300]; [view.layer setValue:finalValue forKeyPath:keyPath]; SKBounceAnimation *bounceAnimation = [SKBounceAnimation animationWithKeyPath:keyPath]; bounceAnimation.fromValue = [NSNumber numbe