Change status bar color dynamically in Swift 4

Question

I would like to change the status bar color between .lightContent and .default dynamically (since my background can change in the same ViewController).

I have tried to make a function for this that looks like this:

func changeStatusBar(useDefault: Bool) {
    if useDefault {
        var preferredStatusBarStyle: UIStatusBarStyle {
            return .default
        }
    } else {
        var preferredStatusBarStyle: UIStatusBarStyle {
            return .lightContent
        }
    }
    setNeedsStatusBarAppearanceUpdate()
}

But no luck. Every guide i found online (or here on Stackoverflow) only shows how to change the statusBar once, and not on and off through a function.

I have also set View controller-based status bar appearance to NO in the info.plist file.

The line i used to use is UIApplication.shared.statusBarStyle = .lightContent - but since this is deprecated since iOS9, i can't use it anymore.

Anyone has some idea how I can change this dynamically?

Answer 1

Create a property with type UIStatusBarStyle and return the value in preferredStatusBarStyle

And you can change its value whenever you need and call setNeedsStatusBarAppearanceUpdate()

class ViewController: UIViewController {

    override var preferredStatusBarStyle: UIStatusBarStyle {
        return self.style
    }
    var style:UIStatusBarStyle = .default

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

    @IBAction func changeStyle(_ sender: UIButton) {
        if self.style == .lightContent {
            self.style = .default
        } else {
            self.style = .lightContent
        }
        setNeedsStatusBarAppearanceUpdate()
    }
}

override var preferredStatusBarStyle: UIStatusBarStyle { return self.style }

wont be called if you have embedded your view controller in a navigation controller You should change bar style of your navigation controller

self.navigationController?.navigationBar.barStyle = //newStyle