ios - 陀螺仪滚动图像有问题

Question

我的 iPad Air 有一个奇怪的问题!!! ，我的代码在 iPad 3、iPad 4、iPhone 5S、iPod 5th Gen 上运行良好，但在 iPad air 上，我的图像会自动滚动而无需用户旋转设备，这是我的代码:

 @property (strong, nonatomic) CMMotionManager *motionManager;


    self.mainScrollView.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);

    self.mainScrollView.bounces = NO;


    self.mainScrollView.userInteractionEnabled = NO;

    //set up the image view
    UIImage *image= [UIImage imageNamed:@"YOUR_IMAGE_NAME"];
    UIImageView *movingImageView = [[UIImageView alloc]initWithImage:image];
    [self.mainScrollView addSubview:movingImageView];

    self.mainScrollView.contentSize = CGSizeMake(movingImageView.frame.size.width, self.mainScrollView.frame.size.height);


    self.mainScrollView.contentOffset = CGPointMake((self.mainScrollView.contentSize.width - self.view.frame.size.width) / 2, 0);

    //inital the motionManager and detec the Gyroscrope for every 1/60 second
    //the interval may not need to be that fast
    self.motionManager = [[CMMotionManager alloc] init];
    self.motionManager.gyroUpdateInterval = 1/60;

    //this is how fast the image should move when rotate the device, the larger the number, the less the roation required.
    CGFloat motionMovingRate = 4;

    //get the max and min offset x value
    int maxXOffset = self.mainScrollView.contentSize.width - self.mainScrollView.frame.size.width;
    int minXOffset = 0;

    [self.motionManager startGyroUpdatesToQueue:[NSOperationQueue currentQueue]
                                withHandler:^(CMGyroData *gyroData, NSError *error) {

         if (fabs(gyroData.rotationRate.y) >= 0.1) {
            CGFloat targetX = self.mainScrollView.contentOffset.x - gyroData.rotationRate.y * motionMovingRate;

             if(targetX > maxXOffset)
                   targetX = maxXOffset;
             else if (targetX < minXOffset)
                   targetX = minXOffset;


             self.mainScrollView.contentOffset = CGPointMake(targetX, 0);
          }
   }];

这是一种动画!!!此代码在其他设备上工作正常!有帮助吗？谢谢

Answer 1

您可以尝试以下操作吗:这会将错误处理添加到您的代码中，因为陀螺仪可能会返回错误，这可能会返回一个 >0.09 的值；在测试时更频繁地使用 NSLOG 来分离代码并查看返回的值。

@property (strong, nonatomic) CMMotionManager *motionManager;


self.mainScrollView.frame = CGRectMake(0, 0, self.view.frame.size.width,       self.view.frame.size.height);

self.mainScrollView.bounces = NO;


self.mainScrollView.userInteractionEnabled = NO;

//set up the image view
UIImage *image= [UIImage imageNamed:@"YOUR_IMAGE_NAME"];
UIImageView *movingImageView = [[UIImageView alloc]initWithImage:image];
[self.mainScrollView addSubview:movingImageView];

self.mainScrollView.contentSize = CGSizeMake(movingImageView.frame.size.width, self.mainScrollView.frame.size.height);


self.mainScrollView.contentOffset = CGPointMake((self.mainScrollView.contentSize.width - self.view.frame.size.width) / 2, 0);

//inital the motionManager and detec the Gyroscrope for every 1/60 second
//the interval may not need to be that fast
self.motionManager = [[CMMotionManager alloc] init];
self.motionManager.gyroUpdateInterval = 1/60;

//this is how fast the image should move when rotate the device, the larger the number, the less the roation required.
CGFloat motionMovingRate = 4;

//get the max and min offset x value
int maxXOffset = self.mainScrollView.contentSize.width - self.mainScrollView.frame.size.width;
int minXOffset = 0;

[self.motionManager startGyroUpdatesToQueue:[NSOperationQueue currentQueue]
                            withHandler:^(CMGyroData *gyroData, NSError *error) {
// IF NO ERROR ---
if(!error){
NSLog(@"No error from Gyroscope %f",gyroData.rotationRate.y);
     if (fabs(gyroData.rotationRate.y) >= 0.1) {
NSLog(@"Moving image");
        CGFloat targetX = self.mainScrollView.contentOffset.x - gyroData.rotationRate.y * motionMovingRate;

         if(targetX > maxXOffset)
               targetX = maxXOffset;
         else if (targetX < minXOffset)
               targetX = minXOffset;


         self.mainScrollView.contentOffset = CGPointMake(targetX, 0);
      }
}
// ERROR returned from GYRO
else NSLog(@"error recieved %@",error);
}];