CATransition

CATransition是一个过渡动画。你可以使用一些预定义好的过渡动画效果或者使用一个CIFilter(滤镜)实例来实现。例如

- (void)transitionAnimation{    UIView *keyPathAnimationView = [[UIView alloc] initWithFrame:CGRectMake(100, 300, 100, 100)];    keyPathAnimationView.backgroundColor = [UIColor blackColor];    [self.view addSubview:keyPathAnimationView];        CATransition *transaction = [CATransition animation];    //transition的类型 包含kCATransitionFade淡化、(kCATransitionMoveIn推挤、kCATransitionPush揭开、kCATransitionReveal覆盖)这三种subtype有效    transaction.type = kCATransitionMoveIn;    //transition的子类型 包含kCATransitionFromTop从顶部到底部、kCATransitionFromLeft从左到右、kCATransitionFromRight从右边出来、kCATransitionFromBottom到底部    transaction.subtype = kCATransitionFromRight;    transaction.duration = 5;    //动画开始进度    transaction.startProgress = 0;    //动画结束进度    transaction.endProgress = 1.;    [keyPathAnimationView.layer addAnimation:transaction forKey:nil];    }