iOS 图片360度循环旋转

在开发时，有时候需要实现图片旋转功能，比如说音频播放器实现专辑图片的转动功能。可以用动画来实现：

初始化动画

-(void)initAnimationWithImageView:(UIImageView *)imageView onSpeed:(float)speed
{
    CABasicAnimation* rotationAnimation;
    rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * speed ];
    rotationAnimation.duration = 0.2;
    rotationAnimation.cumulative = YES;
    rotationAnimation.repeatCount = FLT_MAX;
    [imageView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
}

启动动画

-(void)startAnimationWithImageView:(UIImageView *)imageView
{
    CFTimeInterval pausedTime = [imageView.layer timeOffset];
    imageView.layer.speed = 1.0;
    imageView.layer.timeOffset = 0.0;
    imageView.layer.beginTime = 0.0;
    CFTimeInterval timeSincePause = [imageView.layer convertTime:CACurrentMediaTime()
                                                       fromLayer:nil] - pausedTime;
    imageView.layer.beginTime = timeSincePause;
}

暂停动画

-(void)pauseAnimationWithImageView:(UIImageView *)imageView
{
    CFTimeInterval pausedTime = [imageView.layer convertTime:CACurrentMediaTime() fromLayer:nil];
    imageView.layer.speed = 0.0;
    imageView.layer.timeOffset = pausedTime;
}

声明：此博文源自 http://blog.csdn.net/shenyuanluo/article/details/49096535

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