Native Protocol Binding

Project is used as workaround for solving the bug in Xamarin.iOS Bugzilla.Xamarin.

Application becomes freeze and unresponsive when NSUrlProtocol and UIWebView are used.

Build Dll

To build dll file run:

make -f Makefile

Deployment

Link dll to project

Add mobix.nativeprotocol.dll to References

Create class for proxying requests

MyInterceptorProtocol not intended to have state. It methods could be invoked from different threads.

//MyInterceptorProtocol.cs
using NativeProtocol;

public class MyInterceptorProtocol : NSURLProtocolProxy
{
    public override bool CanInitWithRequest(NSUrlRequest request)
    {
        // check request here
        return false;
    }

    public override void StartLoadingWithProtocol(NSUrlProtocol protocol)
    {
        // load data here
        NSData data = ....;
        
        if (loadedSuccessfull) {
            var headers = new NSMutableDictionary();
            var response = new NSHttpUrlResponse(protocol.Request.Url, (nint)200, "1.1", headers);
            protocol.Client.ReceivedResponse(protocol, response, NSUrlCacheStoragePolicy.NotAllowed);
            protocol.Client.DataLoaded(protocol, data);
            protocol.Client.FinishedLoading(protocol);
        } else {
            protocol.Client.FailedWithError(protocol, new NSError((NSString)protocol.Request.Url.AbsoluteString, (nint)((int)NSUrlError.Unknown)));
        }
    }
}

Register NativeRequestInterceptorProtocol and setup proxy object

//AppDelegate.cs
using NativeProtocol;

public partial class MainAppDelegate : UIApplicationDelegate
{
    private MyInterceptorProtocol proxyForNativeProtocol;
    public override bool FinishedLaunching (UIApplication application, NSDictionary launchOptions)
	{
        SetupUrlNSURLProtocol();
        //do other stuff
        return true;
    }

    private void SetupUrlNSURLProtocol() {
        NSUrlProtocol.RegisterClass(new ObjCRuntime.Class(typeof(NativeRequestInterceptorProtocol)));
        proxyForNativeProtocol = new RequestInterceptorProtocol();
        NativeRequestInterceptorProtocol.SetProxyProxy(proxyForNativeProtocol);
    }
}

License

This project is licensed under the MIT License - see the LICENSE.md file for details