How to prevent gap between uinavigationbar and view in iOS 13?

Question

We are currently having an issue with navigation bar sizing when using modal presentation in iOS 13.

In most cases this works fine as can be seen in this screenshot:

Answer 1

override func viewWillAppear(_ animated: Bool) {  
    super.viewWillAppear(animated)  
    if #available(iOS 13.0, *) {  
        navigationController?.navigationBar.setNeedsLayout()  
    }
}  

We found this work around here and it worked for us.

Answer 2

Like Rod's answer, but I found it only works if I put setNeetsLayout() in next main thread runLoop:

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    // Workaround for iOS 13 modal gap below navigationbar
    if #available(iOS 13.0, *) {
        DispatchQueue.main.async {
            self.navigationController?.navigationBar.setNeedsLayout()
        }
    }
}