iOS开发-CoreMotion框架(加速计和陀螺仪)

http://www.cnblogs.com/xiaofeixiang/p/4317151.html
例子：实现大图屏幕显示不完的情况下，左右偏移显示
原理：使用陀螺仪监听y轴的偏移变化

-(void)startAnimate
{
    //剩余部分滑动速度
    float scrollSpeed = (_myImageView.frame.size.width - self.frame.size.width)/2/SPEED;
    [WJGravity sharedGravity].timeInterval = 0.05;
    
    [[WJGravity sharedGravity]startDeviceMotionUpdatesBlock:^(float x, float y, float z) {
        NSLog(@"%f,%f,%f",x,y,z);
        [UIView animateKeyframesWithDuration:0.3 delay:0 options:UIViewKeyframeAnimationOptionCalculationModeDiscrete animations:^{
            
            //范围最左边到最右边
            if (_myImageView.frame.origin.x <=0 && _myImageView.frame.origin.x >= self.frame.size.width - _myImageView.frame.size.width)
            {
                float invertedYRotationRate = y * -1.0;
                
                //左右晃动y变化最大
                
                //_myImageView现在中心点坐标＋偏移的距离
                float interpretedXOffset = _myImageView.center.x + invertedYRotationRate * (_myImageView.frame.size.width/[UIScreen mainScreen].bounds.size.width) * scrollSpeed;
                
                //改变中心点位置
                _myImageView.center = CGPointMake(interpretedXOffset, _myImageView.center.y);
            }
            
            //如果超出最右边，固定位置不变
            if (_myImageView.frame.origin.x >0)
            {
                _myImageView.frame = CGRectMake(0, _myImageView.frame.origin.y, _myImageView.frame.size.width, _myImageView.frame.size.height);
            }
            //如果超出最左边，固定位置不变
            if (_myImageView.frame.origin.x < self.frame.size.width - _myImageView.frame.size.width)
            {
                _myImageView.frame = CGRectMake(self.frame.size.width - _myImageView.frame.size.width, _myImageView.frame.origin.y, _myImageView.frame.size.width, _myImageView.frame.size.height);
            }
        } completion:nil];
        
        
    }];
}

demo连接:https://github.com/WuJiForFantasy/WJGravity