gistfile1.cs

public override bool FinishedLaunching (UIApplication app, NSDictionary options)
{
    JsBridge.EnableJsBridge();

	window = new UIWindow (UIScreen.MainScreen.Bounds);
	
	// get useragent
	UIWebView agentWebView = new UIWebView ();
	var userAgent = agentWebView.EvaluateJavascript ("navigator.userAgent");
	agentWebView = null;
	userAgent += " XamarinBarcodeSampleApp";
	
	// set default useragent
	NSDictionary dictionary = NSDictionary.FromObjectAndKey(NSObject.FromObject(userAgent), NSObject.FromObject("UserAgent"));
	NSUserDefaults.StandardUserDefaults.RegisterDefaults(dictionary);
	
	viewController = new Xamarin_iOS_BarcodeSampleViewController ();
	window.RootViewController = viewController;
	window.MakeKeyAndVisible ();
	
	viewController.MainWebView.LoadRequest(new NSUrlRequest(new NSUrl("http://xamarinbarcodesample.apphb.com/")));
	
	// listen for the event triggered by the browser.
	viewController.MainWebView.AddEventListener( "scanBarcode", delegate(FireEventData arg) {
	
		// show a native action sheet
		BeginInvokeOnMainThread (delegate { 
			//NOTE: On Android you MUST pass a Context into the Constructor!
			var scanningOptions = new ZXing.Mobile.MobileBarcodeScanningOptions();
			scanningOptions.PossibleFormats = new List<ZXing.BarcodeFormat>() { 
				ZXing.BarcodeFormat.All_1D
			};
			scanningOptions.TryInverted = true;
			scanningOptions.TryHarder = true;
			scanningOptions.AutoRotate = false;
			var scanner = new ZXing.Mobile.MobileBarcodeScanner();
			scanner.TopText = "Hold camera up to barcode to scan";
			scanner.BottomText = "Barcode will automatically scan";
			scanner.Scan(scanningOptions).ContinueWith(t => {   
				if (t.Result != null) {
					//Console.WriteLine("Scanned Barcode: " + t.Result.Text);
	
					// pass barcode back to browser.
					viewController.MainWebView.FireEvent( "scanComplete", new {
						code = t.Result.Text
					});
				}
			});
		});
	
	});
	
	return true;
}