当allowEditing = NO时，UIImagePickerController返回图像nil;并在iPad上运行2倍

Question

- (IBAction) buttonAction:(id) sender {
 if (self.picker == nil) {   
        self.picker = [[UIImagePickerController alloc] init];
        self.picker.delegate = self;
        self.picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        self.picker.allowsEditing = NO;     }  [self.navigationController presentModalViewController:_picker
    animated:YES];     

}

• （void）imagePickerController：（UIImagePickerController *）picker didFinishPickingMediaWithInfo：（NSDictionary *）info {

  [self dismissModalViewControllerAnimated:YES];
  
  UIImage *myImage = (UIImage *) [info
  objectForKey:UIImagePickerControllerOriginalImage]; 
  
   if (myImage == nil) NSLog(@"Image nil");
  
  }
  

它在iPhone设备上运行良好，但在iPhone 2x模式下无法在iPad上运行 错误？ 或者我错了？