ios光碟炫动

#pragma mark 动画转动
-(void)DHZD{
    CABasicAnimation* rotateAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
       rotateAnimation.fromValue = [NSNumber numberWithFloat:0.0];
    // 旋转一周
       rotateAnimation.toValue = [NSNumber numberWithFloat:M_PI * 2];
    // 旋转时间20秒
       rotateAnimation.duration = 20.0;
    // 重复次数，这里用最大次数
       rotateAnimation.repeatCount = MAXFLOAT;
       [self.MainImg.layer addAnimation:rotateAnimation forKey:nil];
    

   
}
#pragma mark 停止转动

-(void)TZZD{
    CFTimeInterval pausedTime = [_MainImg.layer convertTime:CACurrentMediaTime() fromLayer:nil];
            _MainImg.layer.speed = 0.0;                                          // 停止旋转
           _MainImg.layer.timeOffset = pausedTime;                              // 保存时间，恢复旋转需要用到
    
  
}

#pragma mark 恢复转动
-(void)HFZD{
    if  (_MainImg.layer.timeOffset == 0)  {
                [self DHZD];
                return;
    }
    CFTimeInterval pausedTime = _MainImg.layer.timeOffset;
    _MainImg.layer.speed = 1.0;                                         // 开始旋转
      _MainImg.layer.timeOffset = 0.0;
    _MainImg.layer.beginTime = 0.0;
    CFTimeInterval timeSincePause = [_MainImg.layer convertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime;                                             // 恢复时间
    _MainImg.layer.beginTime = timeSincePause;                          // 从暂停的时间点开始旋转
    
}