이미지 회전

#define DEGREES_TO_RADIANS(angle) (angle / 180.0 * M_PI)

- (void)rotateImage:(UIImageView *)image duration:(NSTimeInterval)duration 
       curve:(int)curve degrees:(CGFloat)degrees
{
  // Setup the animation
  [UIView beginAnimations:nil context:NULL];
  [UIView setAnimationDuration:duration];
  [UIView setAnimationCurve:curve];
  [UIView setAnimationBeginsFromCurrentState:YES];
 
  // The transform matrix
  CGAffineTransform transform = 
      CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(degrees));
  image.transform = transform;
 
  // Commit the changes
  [UIView commitAnimations];
}

- (void)startApp
{
  UIImageView *imageToMove =
     [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"ArrowUp.png"]];
  imageToMove.frame = CGRectMake(10, 10, 20, 100);
  [self.view addSubview:imageToMove];
 
  [self rotateImage:imageToMove duration:3.0 
      curve:UIViewAnimationCurveEaseIn degrees:180];
 
  ...
 

}