prefersStatusBarHidden not called

Question

I have a UITabViewController -> UINavigationController -> UIViewController and want to hide and unhide the statusBar. when I call setNeedsStatusBarAppearanceUpdate() the method prefersStatusBarHidden is not called.

func fadeOutStatusBar (notification: NSNotification) {
    statusBarHidden = true
    self.setNeedsStatusBarAppearanceUpdate()
}

func fadeInStatusBar (notification: NSNotification) {
    statusBarHidden = false
    self.setNeedsStatusBarAppearanceUpdate()
}

override func prefersStatusBarHidden() -> Bool {
    return statusBarHidden
}

Answer 1

Maybe not a solution to the OP problem, but what could also be the cause for prefersStatusBarHidden not being called is if you have used a second window in your app delegate, eg for displaying a splash screen, and you did not hide it after the splash was shown - then that window gets the events that lead to calling these functions.

Answer 2

Firstly, View controller-based status bar appearance in the .plist file must be set to YES.

• If you want status bar to be hidden in the whole app:

For Objective-C:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    [application setStatusBarHidden:YES];

    return YES;
}

For Swift:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject:AnyObject]?) -> Bool {
    application.statusBarHidden = true

    return true
}

• If you want status bar is disappeared in Specify View Controller, in .m file, just implement:

For Objective-C:

- (BOOL)prefersStatusBarHidden {
    return YES;
}

For Swift:

override func prefersStatusBarHidden() -> Bool {
    return true
}

Answer 3

If you have other window not hidden, the method not be called. Just hide other window, it will work as you wish

Answer 4

When we nested the UINavigationController, our AppDelegate. Window. RootViewController Usually we create navigationController when first will call in the navigationController childViewControllerForStatusBarHidden function, because the default returns nil, then is called navigationController prefersStatusBarHidden function itself, So the status bar that we set in viewController through the prefersStatusBarHidden function will not be called, so it won't work. So we're going to create our own one that inherits from the NavigationController,in this subclass ChildViewControllerForStatusBarHidden function.

Answer 5

For swift 3, first, make sure that View controller-based status bar appearance is set to YES in your Info plist file

And then just add this to your view controller:

override var prefersStatusBarHidden: Bool {
    get {
        return true
    }
}

I hope this helps people in the future.

Answer 6

Figured it out. in info.plist file: view controller-status bar appearance should be set to YES