一个例子:以下将缓入alpha从0到1。当它反转时，它将从1缓入到0，或者它会反转计时函数，并本质上使用缓出？CABasicAnimation*animation=[CABasicAnimationanimationWithKeyPath:@"alpha"];animation.fromValue=@0;animation.toValue=@1;animation.duration=1.0;animation.timingFunction=[CAMediaTimingFunctioneaseIn];animation.autoreverses=YES; 最佳