之四：CATransition - 转场动画

关键属性：

• type 过渡效果 

1. kCATransitionFade  淡出
2. kCATransitionMoveIn  覆盖原图
3. kCATransitionPush  推出
4. kCATransitionReveal  底部显出来

• subtype 过渡方向

1. kCATransitionFromRight；
2. kCATransitionFromLeft  默认值
3. kCATransitionFromTop；
4. kCATransitionFromBottom

代码演示1：不用setSubtype，只用setType

 animation.type=@"pageCurl";  

1. pageCurl   向上翻一页
2. pageUnCurl   向下翻一页
3. rippleEffect   滴水效果
4. suckEffect   收缩效果，如一块布被抽走
5. cube   立方体效果
6. oglFlip   上下翻转效果

代码演示2：setType与setSubtype组合

 CATransition *animation = [CATransition animation];

 animation.delegate = self;

 animation.duration = 1.0f;

 animation.timingFunction = UIViewAnimationCurveEaseInOut;

 animation.type = kCATransitionMoveIn;

 animation.subtype = kCATransitionFromTop;

 [_myView.layer addAnimation:animation forKey:@"myTransition"];