How to toggle status bar with a fade effect in iOS7 (like Photos app)?

Question

I want to toggle the visibility of the status bar on tap, just like it does in the Photos app.

Prior to iOS 7, this code worked well:

-(void)setStatusBarIsHidden:(BOOL)statusBarIsHidden {

    _statusBarIsHidden = statusBarIsHidden;

    if (statusBarIsHidden == YES) {

        [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];


    }else{

        [[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationFade];

    }

}

But I can't get it to work in iOS 7. All the answers that I found only offer suggestions for permanently hiding the bar but not toggling.

Yet, there must be a way since Photos does it.

Answer 1

By default on iOS 7 or above, to hide the status bar for a specific view controller, do the following:

1. if the view controller you want to hide the status bar with is being presented modally and the modalPresentationStyle is not UIModalPresentationFullScreen, manually set modalPresentationCapturesStatusBarAppearance to YES on the presented controller before it is presented (e.g. in -presentViewController:animated:completion or -prepareForSegue: if you're using storyboards)
2. override -prefersStatusBarHidden in the presented controller and return an appropriate value
3. call setNeedsStatusBarAppearanceUpdate on the presented controller

If you want to animate it's appearance or disappearance, do step three within an animation block:

[UIView animateWithDuration:0.33 animations:^{
    [self setNeedsStatusBarAppearanceUpdate];
}];

You can also set the style of animation by returning an appropriate UIStatusBarAnimation value from -preferredStatusBarUpdateAnimation in the presented controller.

Answer 2

First set View controller-based status bar appearance in Info.plist to YES

This Swift Example shows how to toggle the StatusBar with an Animation, after pressing a Button.

import UIKit

class ToggleStatusBarViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func prefersStatusBarHidden() -> Bool {
        return !UIApplication.sharedApplication().statusBarHidden
    }

    override func preferredStatusBarUpdateAnimation() -> UIStatusBarAnimation {
        return UIStatusBarAnimation.Slide
    }

    @IBAction func toggleStatusBar(sender: UIButton) {
        UIView.animateWithDuration(0.5,
            animations: {
                self.setNeedsStatusBarAppearanceUpdate()
        })
    }
}