How to hide the title bar on the Mac Catalyst version of my MAUI program?

Question

I am just getting into .NET and MAUI, and I wanted to remove the titlebar on this test app. I am not talking about the toolbar created by MAUI (in light grey), but rather the window title bar set my UIKit. This Apple Developers page shows what I want to do.

I have tried changing the title bar visibility in the program.cs inside the MacCatalyst folder (as was suggested here for a slightly unrelated problem), and I do have access to the UIKit.UITitleBar class (and can access its visibility state with the UIKit.UITitlebarTitleVisibility enum), but I have not found a way to turn to change this property.

Answer 1

You need to override the CreateWindow method in your App class to create a Window, I created a new project to test on Mac, you can refer to the following code:

using UIKit;

namespace MauiAppDemo;

public partial class App : Application

{    
  public App()    
  {        
    InitializeComponent();        
    //MainPage = new AppShell();             
  }

  protected override Window CreateWindow(IActivationState activationState)    
  {
    var window = new Window();        
    window.HandlerChanged += windowHandlerChanged;        
    var rootPage = new MainPage();        
    window.Page = rootPage;        
    return window;    
  }

  private void windowHandlerChanged(object sender, EventArgs e)    
  {        
    var win = sender as Microsoft.Maui.Controls.Window;        
    var uiWin = win.Handler.PlatformView as UIWindow;        
    if (uiWin != null)        
    {            
        uiWin.WindowScene.Titlebar.TitleVisibility = UITitlebarTitleVisibility.Hidden;        
    }   
  }
}

Hope it helps.