动画技术：
1.UIView上的动画： 1.通过显式调用的方式： [UIview beginAnimation] [UIView commitAnimation] 期间可设代理,动画时间回调函数，过渡速度曲线，是否自动反向，过渡效果等 [UIView setAnimationDuration] [UIView setAnimationDelegate] [UIView setAnimationDidStopSelector] [UIview setAnimationCurve] [UIView setAnimationRepeatAutoreserves] [UIView setAnimationTransition]
2.通过块方式：
[UIView animationWithDuration]
3.普通提交方式过渡动画
[UIView setAnimationTransition:]
4.针对过渡动画专门设计的两个函数(4.0以后)
[UIView transitionWithView]
[UIView transitionFromView]
2.Layer上的动画： 1.显式增加的普通方式： CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:] [layer addAnimation:anim] 可以设置持续时间，from,to值，重复次数
2.关键桢动画：
1.通过普通方式：
CAKeyframeAnimation *anim =[CAKeyframeAnimation animationWithKeyPath]
anim.values = []
anim.keyTimes = []
[layer addAnimation:anim]
2.通过path的方式增加动画：
CAKeyframeAnimation *anim =[CAKeyframeAnimation animationWithKeyPath]
[anim setPath]
[layer addAnimation:anim]
3.动画组，可以使多个动画同时运行
CAAnimationGroup* group = [CAAnimationGroup animation];
group.animations = [NSArray arrayWithObjects:colorAnim, widthAnim, nil];
[myLayer addAnimation:group forKey:@"BorderChanges"];
4.渐变动画
CATransition* transition = [CATransition animation];
transition.type = kCATransitionPush;
[myView1.layer addAnimation:transition forKey:@"transition"];
3.ViewController切换时的动画： 1.普通切换：需要实现UIViewControllerAnimatedTransitioning协议 2.模态切换：需要实现UIViewControllerTransitioningDelegate协议
4.力学和运动效果 请参考UIDynamicAnimator,UIInteerpolatingMotionEffect类