视图旋转方式

#define DEGREES_TO_RADIANS(d) (d * M_PI / 180)

/*
          [UIView beginAnimations:nil context:nil];
          [UIView setAnimationDuration:0.35];
          self.rotaImageView.layer.transform = CATransform3DRotate(self.rotaImageView.layer.transform, 3*M_PI, 0, 0, 1);
          [UIView commitAnimations];
*/
         
         CABasicAnimation* rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
         
         rotationAnimation.fromValue = [NSNumber numberWithFloat:(DEGREES_TO_RADIANS(180*9))];
         rotationAnimation.toValue = [NSNumber numberWithFloat:(DEGREES_TO_RADIANS(0))];
         rotationAnimation.fillMode = kCAFillModeForwards;
         rotationAnimation.removedOnCompletion = NO;
         rotationAnimation.duration = 0.95f;
         rotationAnimation.autoreverses = NO; // Very convenient CA feature for an animation like this
         rotationAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
         [self.rotaImageView.layer addAnimation:rotationAnimation forKey:@"rotaAnimation"];