Question

在我的iPad应用程序中，我在弹出控制器中打开照片库。它在iOS 4中运行良好，但现在它还没有在iOS 5中开放。我正在使用以下代码打开照片库，

UIImagePickerController* picker = [[UIImagePickerController alloc] init]; 
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    picker.delegate = self;
    picker.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypePhotoLibrary];

    popOver = [[UIPopoverController alloc] initWithContentViewController:picker]; 
    popOver.delegate = self;

    int w = 320;

    CGRect pickerFrame = CGRectMake(0, 0, w, bImportPicker.frame.origin.y);
    [popOver setPopoverContentSize:pickerFrame.size animated:NO];   
    [popOver presentPopoverFromRect:pickerFrame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionDown animated:YES];
    [picker release];

Answer 1

在我的代码中，我有一个UIImageView，每当我点击它时，带有iPhone库中图像的UIPickerView就会在PopOverController中打开。

  UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];

   [myImageView addGestureRecognizer:singleTap];   // added action for SingleTap




  - (void)handleSingleTap:(UIGestureRecognizer *)gestureRecognizer {  
// single tap does nothing for now  

    if ([UIImagePickerController isSourceTypeAvailable: 
                UIImagePickerControllerSourceTypePhotoLibrary]) 
     { 
          UIImagePickerController  *imagePickerController = 
                     [[UIImagePickerController alloc] init];
          imagePickerController.delegate = self;
          imagePickerController.sourceType =
                     UIImagePickerControllerSourceTypePhotoLibrary;

          UIPopoverController  *popVC = [[UIPopoverController alloc] 
                                 initWithContentViewController: imagePickerController];
          popVC.delegate = self; 
         [popVC setPopoverContentSize:CGSizeMake(500, 500)];


         UIView *tempView = gestureRecognizer.view;        
         CGPoint point = CGPointMake(tempView.frame.size.width/2,
                               tempView.frame.size.height/2);
         CGSize size = CGSizeMake(100, 100);
         [popVC presentPopoverFromRect:
                           CGRectMake(point.x, point.y, size.width, size.height) 
                           inView:self.view 
                           permittedArrowDirections:UIPopoverArrowDirectionAny 
                           animated:YES];

       }
     else 
     {
         UIAlertView *alert = [[UIAlertView alloc] 
                             initWithTitle:@"Error accessing photo library"
                             message:@"Device does not support a photo library" 
                             delegate:nil cancelButtonTitle:@"Cancel" 
                             otherButtonTitles:nil]; 
         [alert show]; 
         [alert release];
      }

}

快乐的编码。

Answer 2

当我的可怜客户转移到iOS 5时，他们的UIPopoverController被从屏幕边缘拉出。这是因为iOS 5在解释presentPopoverFromRect的第一个参数时与iOS 4不同。当我确保提供的rect为显示器的rect和边缘之间的UIImagePickerController留出足够的空间时，问题就解决了。使用rect的整个显示将产生这种不正常行为，这类似于你所描述的。

UIPopOverController中的UIImagePickerController未在iOS 5中打开

2 个答案: