手势 UIRotationGestureRecognizer 旋转
UIRotationGestureRecognizer * rotationGesture =
[[UIRotationGestureRecognizer alloc]initWithTarget:self
action:@selector(rotation:)];
[redView addGestureRecognizer:rotationGesture];
[rotationGesture release];
- (void)rotation:(UIRotationGestureRecognizer *)rotation
{
rotation.view.transform = CGAffineTransformRotate(rotation.view.transform, rotation.rotation);
rotation.rotation = 0;
}