Can an iOS XCode application reference MonoTouch assemblies?

I'm considering how to best divide the effort between the teams for a new proj开发者_如何学Cect. We've a Windows C# application services team and a smaller iOS Objective-C team. It's also likely sooner or later an Android application will be required.

A domain layer/api assembly on the device that calls our services and handles synchronising with a local data store is a logical component to write in C# and compile with MonoTouch. Then the Objective-C team references this component. Is that possible? I've read plenty on MonoTouch referencing C assemblies, but can it work the other way around?

It'd be fantastic to hear of any experiences trying this approach out if it is possible!

Thanks Aaron

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Although technically possible, there is no easy way of doing so today.

The best you can do for now is to launch the application from C#, and then, if you want, transfer control to your Objective-C code. During the C# launch, you can register methods to be called back by the Objective-C code using P/Invoke to call something like:

delegate void some_callback_t (int parameter1, int parameter2);

[DllImport ("__Internal")]
void SetCallback (some_callback_t callback);

static void mycallback (int parameter1, int parameter2)
{
    // Here goes your C# logic to be called by C
}

Then you call:

SetCallback (mycallback);

Notice that the mycallback has to be a static method (a limitation of static compilation). Then your Objective-C code can consume services by implementing something like:

 typedef (*callback_t) (int p1, int p2);
 callback_t callback;
 void SetCallback (callback_t cb)
 {
     callback = cb;
 }

 void InvokeCSharp ()
 {
     callback (1, 2);
 }