On iOS how do I migrate my custom PageRenderer to a PageHandler

[PureWeen]

#7174

I want to provide my own ViewController

internal class WorkaroundPageHandler : PageHandler
	{
		class MyPageViewController : PageViewController
		{
			public MyPageViewController(IView page, IMauiContext mauiContext) : base(page, mauiContext)
			{
			}
		}

		protected override Microsoft.Maui.Platform.ContentView CreatePlatformView()
		{
			_ = VirtualView ?? throw new InvalidOperationException($"{nameof(VirtualView)} must be set to create a LayoutView");
			_ = MauiContext ?? throw new InvalidOperationException($"{nameof(MauiContext)} cannot be null");

			if (ViewController == null)
				ViewController = new MyPageViewController(VirtualView, MauiContext);

			if (ViewController is PageViewController pc && pc.CurrentPlatformView is Microsoft.Maui.Platform.ContentView pv)
				return pv;

			if (ViewController.View is Microsoft.Maui.Platform.ContentView cv)
				return cv;

			throw new InvalidOperationException($"PageViewController.View must be a {nameof(Microsoft.Maui.Platform.ContentView)}");
		}
	}

I want to be able to access the ViewController

public partial class MainPage : ContentPage
{
    public MainPage()
    {
        InitializeComponent();
        this.Loaded += MainPage_Loaded;
    }

    private void MainPage_Loaded(object sender, EventArgs e)
    {
#if IOS
        if (Handler is IPlatformViewHandler platformViewHandler)
        {
            var cv = platformViewHandler.ViewController;
            var navItem = cv.NavigationItem;
            System.Diagnostics.Debug.WriteLine($"{navItem}");
        }
#endif
    }
}

[espritm]

Hello @PureWeen
I have binded a iOS library to use it into my Maui application. This provide an instance of a UITableViewController, and I try to display it using a handler, but I can't find how... Could you help please

I tried this :

internal class WorkaroundPageHandler : PageHandler
    {
        UITableViewController NativeUITableViewController;

        public void SetNativeSignatureSettingsUITableViewController(UITableViewController controller)
        {
            this.NativeUITableViewController = controller;
        }

        protected override Microsoft.Maui.Platform.ContentView CreatePlatformView()
        {
            _ = VirtualView ?? throw new InvalidOperationException($"{nameof(VirtualView)} must be set to create a LayoutView");
            _ = MauiContext ?? throw new InvalidOperationException($"{nameof(MauiContext)} cannot be null");

            if (ViewController == null)
                ViewController = this.NativeUITableViewController;

            if (ViewController is PageViewController pc && pc.CurrentPlatformView is Microsoft.Maui.Platform.ContentView pv)
                return pv;

            if (ViewController.View is Microsoft.Maui.Platform.ContentView cv)
                return cv;

            throw new InvalidOperationException($"NativeSignatureSettingsUITableViewController.View must be a {nameof(Microsoft.Maui.Platform.ContentView)}");
        }
    }
}

But it goes into the throw line throw new InvalidOperationException($"NativeSignatureSettingsUITableViewController.View must be a {nameof(Microsoft.Maui.Platform.ContentView)}".

I cannot find a way to create the Microsoft.Maui.Platform.ContentView from a native Viewcontroller.

I tried to have a look there but I can't use this code, the "CrossPlatformLayout" is unknown by my compiler..

Note that I have been able to display the viewcontroller with this native code in maui, but I lost all navigation events :

public partial class MyPage : ContentPage
{
    public MyPage()
    {
        try
        {
            InitializeComponent();

            //.... some code to retrieve the native instance of the native view controller

            UIKit.UITableViewController nativeViewController = myWorkaroundPageHandler.NativeUITableViewController;

            if (Handler is IPlatformViewHandler platformViewHandler)
              platformViewHandler.ViewController.NavigationController.PushViewController(nativeViewController, true);
    }
}

[durandt]

I think ContentView.CrossPlatformLayout was introduced with .NET 8