Can't change UINavigationBar prompt color

Question

I am unable to change the prompt color on my navigation bar. I\'ve tried the code below in viewDidLoad, but nothing happens.

self.navigationCont         


        

Answer 1

More complicated version to support old and new iOS

    func updatePromptUI(for state: State) {
    if (state != .Online) {
        //workaround for SOFT-7019 (iOS 11 bug - Offline message has transparent background)
        if #available(iOS 11.0, *) {
            showPromptView()
        } else {
            showOldPromptView()
        }
    }
    else {
        self.navigationItem.prompt = nil
        if #available(iOS 11.0, *) {
            self.removePromptView()
        } else {
            self.navigationController?.navigationBar.titleTextAttributes = nil
            self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor:UIColor.lightGray]
        }
    }
}

private func showOldPromptView() {
    self.navigationItem.prompt = "Network Offline. Some actions may be unavailable."
    let navbarFont = UIFont.systemFont(ofSize: 16)
    self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.font: navbarFont, NSAttributedStringKey.foregroundColor:UIColor.white]
}

private func showPromptView() {
    self.navigationItem.prompt = String()
    self.removePromptView()

    let promptView = UIView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 18))
    promptView.backgroundColor = .red
    let promptLabel = UILabel(frame: CGRect(x: 0, y: 2, width: promptView.frame.width, height: 14))
    promptLabel.text = "Network Offline. Some actions may be unavailable."
    promptLabel.textColor = .white
    promptLabel.textAlignment = .center
    promptLabel.font = promptLabel.font.withSize(13)
    promptView.addSubview(promptLabel)
    self.navigationController?.navigationBar.addSubview(promptView)
}

private func removePromptView() {
    for view in self.navigationController?.navigationBar.subviews ?? [] {
        view.removeFromSuperview()
    }
}