( 1 ) 旋转一个圈
[UIView animateWithDuration:0.4 delay:0.0 options:UIViewAnimationOptionCurveEaseInOut
animations:^(void) {
// 负号 代表逆时针
sender.transform = CGAffineTransformMakeRotation(- 3.14 * 1);
}completion:nil];
// 旋转结束后 返回原来的transform
sender.transform = CGAffineTransformMakeRotation(0);