CMDeviceMotion使用

manager = [[CMMotionManager alloc] init];

ViewController *__weak weakSelf=self;

// 1

if(manager.deviceMotionAvailable){

    manager.deviceMotionUpdateInterval=0.01f;

    [manager startDeviceMotionUpdatesToQueue:[NSOperationQueue mainQueue]

         withHandler:^(CMDeviceMotion*data,NSError*error){

             double rotation=atan2(data.gravity.x,data.gravity.y)-M_PI;

             weakSelf.imageView.transform=CGAffineTransformMakeRotation(rotation);

             }];

}

// 2

NSOperationQueue *queue = [[NSOperationQueue alloc] init];[manager startDeviceMotionUpdatesToQueue:queue

   withHandler:^(CMDeviceMotion *data, NSError *error) {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{

           double rotation=atan2(data.gravity.x,data.gravity.y)-M_PI;

           weakSelf.imageView.transform=CGAffineTransformMakeRotation(rotation);

       }];

   }];