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Ios swift – How to change height of navigation bar and items size?

I want to create navigation controller and navigation bar programatically. I want to change height and items size and position. My navigation bar height = 74 and item size = 50×50. Also item top space = 12 and bottom = 12. I trying to do it with this code:

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    if let windowScene = (scene as? UIWindowScene) {
        let window = UIWindow(windowScene: windowScene)
        let navigationController = UINavigationController()
        let viewController = ViewController()
        navigationController.viewControllers = [viewController]
        window.rootViewController = navigationController
        self.window = window
        window.makeKeyAndVisible()
    }
}

ViewController

override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        self.navigationController?.navigationBar.backgroundColor = .gray
        self.navigationController?.navigationBar.frame.size.height = 74
        navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: nil, action: nil)
        
        let menuBtn = UIButton(type: .custom)
        menuBtn.frame = CGRect(x: 0.0, y: 12.0, width: 50, height: 50)
        menuBtn.setImage(UIImage(named:"mute"), for: .normal)

        let menuBarItem = UIBarButtonItem(customView: menuBtn)
        menuBarItem.customView?.widthAnchor.constraint(equalToConstant: 50).isActive = true
        menuBarItem.customView?.heightAnchor.constraint(equalToConstant: 50).isActive = true
        menuBarItem.setBackgroundVerticalPositionAdjustment(12.0, for: .default)
        self.navigationItem.rightBarButtonItem = menuBarItem
    }

But it doesn’t work. I don’t see the height of the navigation bar changed, nor the size and position of the navigation buttons. How to solve a problem?

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2

Answers


  1. 0

    Try this instead.
    You can just wrap your viewController in a UINavigationController when you’re setting the rootViewController.

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    if let windowScene = (scene as? UIWindowScene) {
        let window = UIWindow(windowScene: windowScene)
               self.window.rootViewController = UINavigationController(rootViewController: viewController())
        self.window = window
        window.makeKeyAndVisible()
    }
}
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  2. 0

    There is no way to increase navigation bar height. But instead, we can use private API, called "_UINavigationBarPalette", used in Apple apps, such as Calendar and Fitness.

    let contentView = UIView()
contentView.frame.size.height = 100.0

let _UINavigationBarPalette = NSClassFromString(["_", "UI", "Navigation", "Bar", "Palette"].joined()) as! UIView.Type
let palette = _UINavigationBarPalette.perform(NSSelectorFromString("alloc"))
    .takeUnretainedValue()
    .perform(NSSelectorFromString("initWithContentView:"), with: contentView)
    .takeUnretainedValue()
        
navigationItem.perform(NSSelectorFromString(["_", "set", "Bottom", "Palette", ":"].joined()), with: palette)

    Please note, that I split raw strings to bypass AppStore static analyser. Otherwise your app will be rejected due to private API usage.

    Source: https://x.com/search?q=_UINavigationBarPalette&src=typed_query

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