UIImageView旋转动画

_loadingView = [[UIImageView
alloc]initWithFrame:CGRectMake(150,
300,
50, 50)];

_loadingView.image = [UIImage
imageNamed:@"22"];

[self.view
addSubview:_loadingView];

CABasicAnimation* rotationAnimation;

rotationAnimation = [CABasicAnimation
animationWithKeyPath:@"transform.rotation.z"];

rotationAnimation.toValue = [NSNumber
numberWithFloat: M_PI *
2.0 ];

rotationAnimation.duration =
0.2;

rotationAnimation.cumulative =
YES;

rotationAnimation.repeatCount =
100000;

[_loadingView.layer
addAnimation:rotationAnimation
forKey:@"rotationAnimation"];//开始动画

_loadingView.layer removeAnimationForKey:<#(NSString *)#>//结束动画

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