Microsoft.Maui.Platforms.MacOS.Essentials

.NET MAUI for macOS (AppKit)

A native .NET MAUI backend for macOS using AppKit — not Mac Catalyst.

This backend lets MAUI applications run as true native macOS apps that use AppKit controls (NSWindow, NSButton, NSScrollView, etc.) and follow standard macOS UI conventions (menu bar, toolbar, sidebar flyout, native dialogs, etc.).

Inspiration: Originally based on the shinyorg/mauiplatforms project. The Xamarin.Forms Xamarin.Forms.Platform.MacOS backend is also a useful historical reference for AppKit control mappings, although this project uses MAUI's modern handler architecture rather than the legacy renderer model.

Packages

Prerequisites

• .NET 10 SDK
• macOS 14 (Sonoma) or later
• Xcode command line tools (for sips / iconutil — used by the icon build target)

Quick start

1. Project file

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net10.0-macos</TargetFramework>
    <OutputType>Exe</OutputType>
    <UseMaui>true</UseMaui>
    <SingleProject>true</SingleProject>
    <SupportedOSPlatformVersion>14.0</SupportedOSPlatformVersion>

    <ApplicationTitle>My macOS App</ApplicationTitle>
    <ApplicationId>com.example.myapp</ApplicationId>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" />
    <PackageReference Include="Microsoft.Maui.Platforms.MacOS" Version="*" />
    <PackageReference Include="Microsoft.Maui.Platforms.MacOS.Essentials" Version="*" />
  </ItemGroup>

  <ItemGroup>
    <MauiIcon Include="Resources\AppIcon\appicon.png" />
  </ItemGroup>
</Project>

2. Main.cs

using AppKit;

public class MainClass
{
    static void Main(string[] args)
    {
        NSApplication.Init();
        NSApplication.SharedApplication.Delegate = new MauiMacOSApp();
        NSApplication.Main(args);
    }
}

3. MauiMacOSApp.cs

using Foundation;
using Microsoft.Maui.Platforms.MacOS;

[Register("MauiMacOSApp")]
public class MauiMacOSApp : MacOSMauiApplication
{
    protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
}

4. MauiProgram.cs

using Microsoft.Maui.Platforms.MacOS.Hosting;

public static class MauiProgram
{
    public static MauiApp CreateMauiApp()
    {
        var builder = MauiApp.CreateBuilder();
        builder
            .UseMauiAppMacOS<App>()
            .AddMacOSEssentials()
            .ConfigureFonts(fonts =>
            {
                fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
            });

        return builder.Build();
    }
}

5. App.cs

public class App : Application
{
    protected override Window CreateWindow(IActivationState? activationState)
        => new Window(new MainPage());
}

Building / running the sample

dotnet build platforms/MacOS/MacOS.slnx
dotnet run --project platforms/MacOS/samples/MacOS.Sample/

MAUI DevFlow integration

The sample app supports the optional in-process MAUI DevFlow agent:

dotnet run --project platforms/MacOS/samples/MacOS.Sample/ -p:EnableMauiDevFlow=true

This exposes a local HTTP API and MCP server for inspecting the running app's visual tree, capturing screenshots, automating interactions, and more. See src/DevFlow/ and the maui-platform-backend skill's devflow-integration.md reference for details.

License

MIT — see LICENSE.