UIImagePickerController not presenting in iOS 8

Question

Is anyone else having an issue with UIImagePickerController in iOS 8? The method below works perfectly well in iOS 7 on an iPad, but I get the following error

Answer 1

UIImagePickerController *imagePickerController= [[UIImagePickerController alloc] init];
[imagePickerController setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];

// image picker needs a delegate so we can respond to its messages
[imagePickerController setDelegate:self];
self.shouldCallViewWillAppear = NO;

if(IS_IOS8)
{
    [[NSOperationQueue mainQueue] addOperationWithBlock:^{
        // Place image picker on the screen
        [self presentViewController:imagePickerController animated:YES completion:nil];
    }];
}
else
{
    [self presentViewController:imagePickerController animated:YES completion:nil];
}

Answer 2

I was facing the same problem in iOS 8. Then I saw the change log of the latest update to iOS i.e. 8.0.2 on the device.

It is mentioned in this update that_

"Fixes an issue that prevented some apps from accessing photos from Photo Library"

So test your app using XCode 6 on device with iOS 8.0.2 version it will work fine Don't test it on iOS 8.0 simulator.

This helped me, hope the same for you.

Answer 3

All you need to do is dismiss already presented ViewController:

if (self.presentedViewController) {
    [self.presentedViewController dismissViewControllerAnimated:YES completion:nil];
}

[self openPhotoPicker:sourceType];

If it still produces error, put openPhotoPicker: to completion handler

Answer 4

I think this is because in iOS 8, alert views and action sheets are actually presented view controllers (UIAlertController). So, if you're presenting a new view controller in response to an action from the UIAlertView, it's being presented while the UIAlertController is being dismissed. I worked around this by delaying the presentation of the UIImagePickerController until the next iteration of the runloop, by doing this:

[[NSOperationQueue mainQueue] addOperationWithBlock:^{
    [self openPhotoPicker:sourceType];
}];

However, the proper way to fix this is to use the new UIAlertController API on iOS 8 (i.e. use if ([UIAlertController class]) ... to test for it). This is just a workaround if you can't use the new API yet.

Answer 5

I simply did this:

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND,
                                         (unsigned long)NULL), ^(void) {

    [self retractActivePopover];

    dispatch_async(dispatch_get_main_queue(), ^ {

        _activePopover=imagePickerPopover;

        UIBarButtonItem *callingButton = (UIBarButtonItem*) sender;

        [imagePickerPopover presentPopoverFromBarButtonItem:callingButton permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];

    });

});

Answer 6

I agree with Ben Lings issue detection. I would suggest a simpler solution in case when using UIActionSheet. I simply moved my code that reacts on Action Sheet selection from:

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex;
{
// my code
}

into:

- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex;  // after animation
{
// my code
}

This way app is guarantied that code will be executed AFTER UIActionSheet animation finishes.

Since UIAlertView has similar delegate method:

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex;  // after animation
{
// my code
}

I suppose that similar solution may apply.