Friday, September 10, 2010

UIImagePickerController strange behavior

Here is a piece of UIImagePickerController source code. The source code is really straight forward. Say, we have a ViewController and in the .m file, we declare the following information:LoadCamera is a function that open the initiates the UIImagePickerController and adds it to the delegate's window. What's wrong with the code? 

-(IBAction)loadCamera:(UIButton *)sender{
     PagingScrollViewAppDelegate *appDelegate = (PagingScrollViewAppDelegate *)[[UIApplication sharedApplication] delegate];

     imagePickerController = [[UIImagePickerController alloc] init];
     imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
     imagePickerController.delegate = self;
     [appDelegate.window addSubview:imagePickerController.view];
The strange thing occurs when I select an image inside the UIImagePickerController, instead of calling the
- (void)imagePickerController:(UIImagePickerController *)picker 
          didFinishPickingImage:(UIImage *)image
                      editingInfo:(NSDictionary *)editingInfo
it calls the

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
Basically, it is due to the fact that we are adding the UIImagePickerController's view as a subview of the main view.
UIImagePickerController should be presented modally. Else, it gives strange behavior! 

Hope that helps!

UIViewController *viewController = [[[UIViewController alloc] initWithNibName:nil bundle:nil] autorelease];
self.navController = [[[UINavigationController alloc]           
                           initWithRootViewController:viewController] autorelease ];
[appDelegate.window addSubview: [navController view]];
[navController presentModalViewController:myImagePicker animated: YES];

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