Hide/Show status bar iOS Swift

Appearance.swift

// The methods of Appearance.StatusBar can be used to hide and show the status bar on iOS.
// As mention in other places, this is more like hack than a solution. I personally don't like it.
// However if on your application you are making use of navigationBar or similar components,
// hidding the statusBar on the right way (overriding `prefersStatusBarHidden`) will mess with your constraints.
// For more details please refer to this answer and its comments: https://stackoverflow.com/a/44066303/8483739

struct Appearance {
    private init() {}
}

extension Appearance {
    struct StatusBar {
        
        private static weak var application: UIApplication!
        
        private init() {}
        
        static func setup(_ application: UIApplication) {
            self.application = application
        }
        
        static func hide() {
            application.keyWindow?.windowLevel = UIWindowLevelStatusBar
        }
        
        static func show() {
            application.keyWindow?.windowLevel = UIWindowLevelNormal
        }
    }
}

// MARK: - To set it up

class AppDelegate: UIResponder, UIApplicationDelegate {
    //....
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        //....
        setGlobalAppearance(application)
        //....
    }
}

extension AppDelegate {
    private func setGlobalAppearance(_ application: UIApplication) {
        Appearance.StatusBar.setup(application)
        //....
    }
}

// MARK: - To use it

Appearance.StatusBar.hide()
Appearance.StatusBar.show()