Help with my First Foreign Code Module

I’m using the InterApp methods to open waze or google maps from my app, but, i need to check if that ap exists before calling it, so thats the reason of this module.

when I try to preview, i got the message: checkUrl is not on this scope, do you forgot to require a module?

that’s my code:

using Fuse;
using Fuse.Scripting;
using Fuse.Reactive;
using Uno.UX;
using Uno.Compiler.ExportTargetInterop;

public class UrlModule : NativeModule
    static readonly UrlModule _instance;

    public UrlModule()
        // Make sure we're only initializing the module once
        if(_instance != null) return;

        _instance = this;
        Resource.SetGlobalKey(_instance, "UrlModule");
        AddMember(new NativeFunction("canOpenUrl", (NativeCallback)canOpenUrl));

    public static extern(iOS) bool checkUrl(string url)
        NSString* appURL = [NSString stringWithFormat:@"%@", url];
        BOOL canOpenURL = [[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:appUrl]];
        return canOpenURL;

    static object canOpenUrl(Context c, object[] args)
        return checkUrl("maps://");


thanks in advance.

for working in Preview you should implement this:

public static extern(!(iOS || Android)) bool checkUrl(string url) {
    return /some code on Uno's Runtime/

ok, i’ll test it.