iOS旋转动画

CGAffineTransform transform;

//设置旋转度数

transform = CGAffineTransformRotate(Btn37.transform,M_PI);

//动画开始

[UIView beginAnimations:@"rotate" context:nil ];

//动画时常

[UIView setAnimationDuration:0.1];

//添加代理

[UIView setAnimationDelegate:self];

//获取transform的值

[Btn37 setTransform:transform];

//关闭动画

[UIView commitAnimations];