UIImagePickerController in iOS 6 doesn't work properly

问题

I'm having a very strange behavior:

in iOS 5 I present UIImagePickerController in this way:

imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera; imagePicker.modalPresentationStyle = UIModalPresentationFullScreen; imagePicker.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

[self presentModalViewController:imagePicker animated:YES];

now in iOS 6 this produce a crash. I resolved the crash by writing a category on UIImagePickerController:

@implementation UIImagePickerController (NonRotating)

- (BOOL)shouldAutorotate
{
    return NO;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return UIInterfaceOrientationMaskPortrait;
}

- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskAll;
}

@end

The problem is that now the UIImagePickerController doesn't rotate and it's shown up-side. Moreover, when I press the "cancel" button and the picker is dismissed, the app crash again.

If I use the UIImagePickerController inside a UIPopoverController, all works fine (belonging to the fact that the popover doesn't rotate) but when I dismiss the popover ALL view controller in my app stop responding to rotation events and this cause that all app is blocked in this orientation. To restore the correct behavior I need to quit the app from the background and open again.

This is the code I'm using to display popover

_cameraPopoverController = [[UIPopoverController alloc] initWithContentViewController:imagePicker];
[_cameraPopoverController presentPopoverFromRect:_takeFromCamera.frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

This problem drive me crazy !

回答1:

What is your picker source type? Photo library/album or camera roll?

Assuming that you are using Photo Library / Album source, on iPad, you MUST use a popover:

http://developer.apple.com/library/ios/#documentation/uikit/reference/UIImagePickerController_Class/UIImagePickerController/UIImagePickerController.html (look in the overview, point 4)

presenting it fullscreen is not supported.

About the other issue (after dismissing the popOver, the other VC's stops rotating) check that you have a STRONG reference to your popover (strong property). Paste the code you are using to present the popover.

回答2:

While I don't recommend using the category to override the image picker's default behavior, there is a bug in the implementation that causes the crash mentioned:

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return UIInterfaceOrientationMaskPortrait;
                                 ~~~~
}

The return value shouldn't be an orientation mask, it should be an orientation, e.g. UIInterfaceOrientationPortrait.

来源：https://stackoverflow.com/questions/14382954/uiimagepickercontroller-in-ios-6-doesnt-work-properly

标签

ios

ipad

ios6

uiimagepickercontroller