iOS7 hide status bar; "prefersStatusBarHidden" is callback (delegate) method

https://devforums.apple.com/message/888605#888605
by Tobias Arends

There are two different cases depending on the value of View controller-based status bar appearance in your info.plist. The default value is YES.

First Case:
Set View controller-based status bar appearance in your info.plist to NO.

You can use:

[[UIApplication sharedApplication] setStatusBarHidden:NO];

You would Implement the following to achieve the hidden statusBar:

-(void)takePhotoPressed{

    UIImagePickerController *picker = [[UIImagePickerController alloc] init];

    picker.delegate = self;

    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])

        return;

    picker.sourceType = UIImagePickerControllerSourceTypeCamera;

    [self presentViewController:picker animated:YES completion:^{

        [[UIApplication sharedApplication] setStatusBarHidden:YES];

    }];

}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{

    [self dismissViewControllerAnimated:YES completion:^{

           [[UIApplication sharedApplication] setStatusBarHidden:NO];

    }];
}

Second Case:
If you set View controller-based status bar appearance in your info.plist to YES. (Or you don't set it at all. It will default to YES)

This seems to be a very bad idea. But it does work.

Create a Category on UIViewController and override prefersStatusBarHidden to always return YES.
You can still override it to return NO in every ViewController in which you want to display the StatusBar.