.net maui and swift

Question

hi guys,

I'm trying to build a .NET Maui class library which exposes some interface that can be used by a macOS swift application.  I'm using .NET Maui 8.0 and Xcode 15.4

can someone guide me to how it can be done?

here is the example of the interface I want to expose:

namespace BridgesServices

{

public delegate void doAction(string action);

public interface IBridgesServices

{

    bool Init(doAction doAction);

    void SendRequest(string action);

}

}

Answer 1

you can build a native library (iOS/mac support is experimental). you need to define the all the entry points as static [UnmanagedCallersOnly] methods . this limits the type of parameters, for example strings are not supported.

https://learn.microsoft.com/en-us/dotnet/core/deploying/native-aot/interop

for c# to call the native library, you will need to use [DllImport] for the entry points. you could build an additional .net dll to expose c# callable methods.

for swift to call the library, you would need to create a c/c++ header file.

https://developer.apple.com/documentation/swift/using-imported-c-functions-in-swift

you can also create a swift package to wrap the library.

https://www.swift.org/documentation/articles/wrapping-c-cpp-library-in-swift.html

Answer 2

Hello,

I need a dual communication between swift native app and a .net Maui class library using this interface. While the native swift app initiates the communication.

You cannot use the MAUI class library in a swift project, it's not supported. The iOS library can be used in Maui, but not vice versa.

See What is .NET MAUI? - .NET MAUI | Microsoft Learn

Best Regards,

Wenyan Zhang

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