CALayer、CCLayer、CAAnimation、CGAnimation的关系

1.UIView动画（块）——（指过渡效果的动画）

UIView视图的动画功能，可以使在更新或切换视图时有放缓节奏、产生流畅的动画效果，进而改善用户体验。UIView可以产生动画效果的变化包括：位置变化：在屏幕上移动视图。大小变化：改变视图框架（frame）和边界。拉伸变化：改变视图内容的延展区域。改变透明度：改变视图的alpha值。改变状态：隐藏或显示状态。改变视图层次顺序：视图哪个前哪个后。旋转：即任何应用到视图上的仿射变换（transform）。示例代码：

1 [UIView beginAnimations:nil context:nil];
2 //setAnimationCurve来定义动画加速或减速方式
3 [UIView setAnimaitonCurve:UIViewAnimationCurveLinear];
4 [UIView setAnimationDuration:2.7]; //动画时长
5 [UIView setAnimationTransition:transition forView:self.view cache:YES];
6 // operation>>>
7 [self.view exchangeSubviewAtIndex:0 withSubviewAtIndex:1];
8 // end<<<<<
9 [UIView commitAnimations];

1 [UIView beginAnimations:nil context:nil];
2 //setAnimationCurve来定义动画加速或减速方式
3 [UIView setAnimaitonCurve:UIViewAnimationCurveLinear];
4 [UIView setAnimationDuration:2.7]; //动画时长
5 [UIView setAnimationTransition:transition forView:self.view cache:YES];
6 // operation>>>
7 [self.view exchangeSubviewAtIndex:0 withSubviewAtIndex:1];
8 // end<<<<<
9 [UIView commitAnimations];10 

1 [UIView beginAnimations:nil context:nil];
2 //setAnimationCurve来定义动画加速或减速方式
3 [UIView setAnimaitonCurve:UIViewAnimationCurveLinear];
4 [UIView setAnimationDuration:2.7]; //动画时长
5 [UIView setAnimationTransition:transition forView:self.view cache:YES];
6 // operation>>>
7 [self.view exchangeSubviewAtIndex:0 withSubviewAtIndex:1];
8 // end<<<<<
9 [UIView commitAnimations];10 

基本动画效果：
UIViewAnimationTransitionNone 正常
UIViewAnimationTransitionFlipFromLeft 从左向右翻
UIViewAnimationTransitionFlipFromRight 从右向左翻
UIViewAnimationTransitionCurlUp 从下向上卷
UIViewAnimationTransitionCurlDown 从上向下卷

2.core方式:使用CATransition类

iPhone还支持Core Animation作为其QuartzCore架构的一部分，CA API为iPhone应用程序提供了高度灵活的动画解决方案。但是须知：CATransition只针对图层，不针对视图。图层是Core Animation与每个UIView产生联系的工作层面。使用CoreAnimation时，应该将CATransition应用到视图的默认图层（[myView layer]）而不是视图本身。使用CATransition类实现动画，只需要建立一个Core Animation对象，设置它的参数，然后把这个带参数的过渡添加到图层即可。使用要引入QuartzCore.framework 代码#import <QuartzCore/QuartzCore.h>示例代码：

1 CATransition *transition = [CATransition animation];
2 transition.duration = 0.7;
3 transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
4 transition.type = kCATransitionMoveIn;//{kCATransitionMoveIn, kCATransitionPush, kCATransitionReveal, kCATransitionFade};
5
6 //更多私有{@"cube",@"suckEffect",@"oglFlip",@"rippleEffect",@"pageCurl",@"pageUnCurl",@"cameraIrisHollowOpen",@"cameraIrisHollowClose"};
7 transition.subtype = kCATransitionFromLeft;//{kCATransitionFromLeft, kCATransitionFromRight, kCATransitionFromTop, kCATransitionFromBottom};

9 transition.delegate = self;
10 [self.view.layer addAnimation:transition forKey:nil];
12 // 要做的
13 [self.view exchangeSubviewAtIndex:1 withSubviewAtIndex:0];

动画嵌套使用：

[UIView animateWithDuration:1.25 animations:^{CGAffineTransform newTransform = CGAffineTransformMakeScale(1.2, 1.2);[firstImageView setTransform:newTransform];[secondImageView setTransform:newTransform];} completion:^(BOOL finished){[UIView animateWithDuration:1.2 animations:^{[firstImageView setAlpha:0];[secondImageView setAlpha:0];} completion:^(BOOL finished){ [firstImageView removeFromSuperview]; [secondImageView removeFromSuperview];}]; }];