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