能否使用.NET 6开发移动应用并保留平台专属UI实现（不采用MAUI跨平台UI方案）？

Absolutely! You can absolutely build mobile apps with .NET 6 while keeping fully platform-specific UI implementations (UIViewControllers on iOS, Activities on Android) without relying on MAUI's cross-platform UI stack. Here's a breakdown of how to make this work, along with practical examples:

This approach leverages the official .NET platform-specific mobile SDKs (formerly Xamarin Native) that are fully integrated with .NET 6. They let you write 100% native UI code in C# while sharing business logic, data access, or other cross-cutting code via shared .NET libraries.

Step 1: Set Up Your Solution Structure #

Start by creating a multi-project solution with three components:

• A .NET Class Library (net6.0) for shared code: This is where you'll put logic that doesn't depend on platform-specific APIs (e.g., data models, API clients, business rules).
• An iOS App (net6.0-ios) project: This will contain all your UIViewControllers, storyboards/XIBs, and iOS-specific logic.
• An Android App (net6.0-android) project: This will hold your Activities, XML layouts, and Android-specific code.

Step 2: Implement Platform-Specific UI #

For iOS (Using UIKit & UIViewControllers) #

You can build UI either visually via Xcode's Interface Builder (storyboards/XIBs) or programmatically with C#—just like native iOS development, but with C# syntax.

Example of a programmatic UIViewController:

using UIKit;
using CoreGraphics;

namespace MyiOSApp
{
    public class HomeViewController : UIViewController
    {
        public override void ViewDidLoad()
        {
            base.ViewDidLoad();
            View.BackgroundColor = UIColor.SystemBackground;

            // Add a welcome label programmatically
            var welcomeLabel = new UILabel
            {
                Text = "Hello from .NET 6 + UIKit!",
                Frame = new CGRect(20, 120, View.Bounds.Width - 40, 32),
                TextAlignment = UITextAlignment.Center,
                Font = UIFont.SystemFontOfSize(20, UIFontWeight.Semibold)
            };
            View.AddSubview(welcomeLabel);
        }
    }
}

For Android (Using Activities & XML Layouts) #

Similarly, you'll create Activities and XML layouts exactly as you would in native Android development, but with C# for the logic layer.

Example of an Activity with a linked XML layout:

using Android.App;
using Android.OS;
using Android.Widget;

namespace MyAndroidApp
{
    [Activity(Label = "@string/app_name", MainLauncher = true)]
    public class MainActivity : Activity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.activity_main);

            // Update text from the layout
            var welcomeText = FindViewById<TextView>(Resource.Id.welcome_text);
            welcomeText.Text = "Hello from .NET 6 + Android Activities!";
        }
    }
}

Corresponding Resources/layout/activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">

    <TextView
        android:id="@+id/welcome_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:textStyle="bold"/>
</LinearLayout>

Step 3: Share Logic Across Platforms #

Reference your shared .NET 6 class library from both the iOS and Android projects, then call its methods directly from your platform-specific UI code.

Example shared service:

// In MySharedLibrary project
namespace MySharedLibrary
{
    public class AppDataService
    {
        public string GetSharedGreeting()
        {
            return "This message comes from shared .NET 6 code!";
        }
    }
}

Use it in iOS:

var dataService = new MySharedLibrary.AppDataService();
welcomeLabel.Text = dataService.GetSharedGreeting();

Use it in Android:

var dataService = new MySharedLibrary.AppDataService();
welcomeText.Text = dataService.GetSharedGreeting();

Key Things to Know #

• Tooling Support: You can use Visual Studio 2022 (Windows or Mac) to build these projects—full support for Xcode's Interface Builder on Mac and Android's Layout Editor on both platforms.
• No MAUI Dependencies: You won't need to add any MAUI NuGet packages or use MAUI's cross-platform controls. Your UI is 100% native, just written in C#.
• Platform APIs: You have full access to all native iOS/Android APIs via C# bindings, so you can implement any platform-specific feature you need (e.g., Core Location on iOS, LocationManager on Android).

内容的提问来源于stack exchange，提问作者MobileDev