图层旋转

    CABasicAnimation* rotationAnimation;

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

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

    rotationAnimation.duration = 1.0f;

    rotationAnimation.cumulative = YES;

    rotationAnimation.repeatCount = 100000;

    

    [_finishIconImage.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];