Dismiss UIImagePickerController when Enter Background modes

Question

I use UIImagePickerController for using Camera and Camera Roll in my project.

This is my example code

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

[self presentViewController:picker animated:YES completion:NULL];

It worked but if i want to dismiss it when i enter to background mode. how to fix it.

Thank you and sorry for my english.

Answer 1

You can listen to the UIApplicationDidEnterBackgroundNotification notification using the NSNotificationCenter.

With that, you can setup a method to be called whenever the app goes into the background where you can check if the picker is being displayed (perhaps store a reference to it whenever it is being displayed):

- (void)presentImagePicker
{
    if (self.displayedPicker) {
        return;
    }

    self.displayedPicker = [[UIImagePickerController alloc] init];
    self.displayedPicker.delegate = self;
    self.displayedPicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    [self presentViewController:self.displayedPicker animated:YES completion:nil];

    // Register for the method to be called every time the app enters the background
    [[NSNotificationCenter defaultCenter]
        addObserver:self
        selector:@selector(didEnterBackgroundNotification:)
        name:UIApplicationDidEnterBackgroundNotification
        object:nil
    ];
}

- (void)dismissImagePickerAnimated:(BOOL)animated
{
    if (self.displayedPicker) {
        [self.displayedPicker dismissViewControllerAnimated:animated];
        self.displayedPicker = nil;

        // Unregister from notification
        [[NSNotificationCenter defaultCenter]
            removeObserver:self
            name:UIApplicationDidEnterBackgroundNotification
            object:nil
        ];
    }
}

- (void)didEnterBackgroundNotification:(NSNotification *)notification
{
    [self dismissImagePickerAnimated:NO];
}

Answer 2

You have to make the UIImagePickerController a property in your class. In your AppDelegate Class you can implement the applicationDidEnterBackground: Method in wich you can put something like this:

[yourViewController.picker dismissModalViewControllerAnimated:YES];

This should dismiss the ImagePicker if your app enters the background. Hope this helps.. :)