Screen Orientation in .NET Maui Application

Question

I am looking to force a certain page to be displayed in landscape mode only. Is there a way to do this in shared code (I am only producing for iOS and Android, no Windows or MacCatalyst needed).

Answer 1

Hello,

You can do this by invoke native platform code in shared code part.

Firstly, you can use Conditional compilation to wrap the native platform code for different platform.

For example, If I have contentpage, I want to set the landscape mode when the page appearing.

For Android, you can set Platform.CurrentActivity.RequestedOrientation = ScreenOrientation.Landscape; directly.

For iOS, you need to get the RootViewController then set UIInterfaceOrientationMask.LandscapeLeft.

You can refer to the following code.

#if ANDROID
using Android.Content.PM;
#elif IOS
using Microsoft.Maui.Devices;
using UIKit;
#endif

namespace MauiAppTestInstallPackage;

public partial class NewPage1 : ContentPage
{
    public NewPage1()
    {
        InitializeComponent();
    }

   protected override void OnAppearing()
    {
        base.OnAppearing();
      
#if ANDROID

       Platform.CurrentActivity.RequestedOrientation = ScreenOrientation.Landscape;

#elif IOS
   
            if (UIDevice.CurrentDevice.CheckSystemVersion(16, 0))
            {


               var scene = (UIApplication.SharedApplication.ConnectedScenes.ToArray()[0] as UIWindowScene);
                if (scene != null)
                {
                    var uiAppplication = UIApplication.SharedApplication;
                    var test = UIApplication.SharedApplication.KeyWindow?.RootViewController;
                    if (test != null)
                    {
                        UIInterfaceOrientationMask NewOrientation;
                        
                        NewOrientation = UIInterfaceOrientationMask.LandscapeLeft;
                        
                        scene.RequestGeometryUpdate(
                            new UIWindowSceneGeometryPreferencesIOS(NewOrientation), error => { System.Diagnostics.Debug.WriteLine(error.ToString()); });
                        test.SetNeedsUpdateOfSupportedInterfaceOrientations();
                        test.NavigationController?.SetNeedsUpdateOfSupportedInterfaceOrientations();
                    }
                }
            }
        
#endif
    }
}

For the iOS, please do not forget to add GetSupportedInterfaceOrientations method in AppDelegate.cs like following code.

  [Register("AppDelegate")]
    public class AppDelegate : MauiUIApplicationDelegate
    {
        protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();


       [Export("application:supportedInterfaceOrientationsForWindow:")]
        public UIInterfaceOrientationMask GetSupportedInterfaceOrientations(UIApplication application, UIWindow forWindow)
        {
            if (forWindow.WindowScene != null && forWindow.WindowScene.Title == "PerformOrientation")
            {
                return UIInterfaceOrientationMask.All;
            }
            else
            {
                return application.SupportedInterfaceOrientationsForWindow(forWindow);
            }
        }


   }

Best Regards,

Leon Lu

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