1. 渐变动画
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.0];
改变frame等
[UIView commitAnimation];
[UIView animateWithDuration: animations: completion:]
1. 渐变动画
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.0];
改变frame等
[UIView commitAnimation];
[UIView animateWithDuration: animations: completion:]