CABasicAnimation* rotationAnimation;
rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2.0 ];
rotationAnimation.duration = 0.8;
rotationAnimation.cumulative = YES;
rotationAnimation.repeatCount = 10000;
[hud.customView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
//移除
[hud.customView.layer removeAnimationForKey:@"rotationAnimation"];
