AppDelegate.cs

public override bool FinishedLaunching(UIApplication app, NSDictionary options)
{
    #if ENABLE_TEST_CLOUD
    Xamarin.Calabash.Start();
    #endif

    Forms.Init();

    Forms.ViewInitialized += (object sender, ViewInitializedEventArgs e) => {
        // http://developer.xamarin.com/recipes/testcloud/set-accessibilityidentifier-ios/
        if (null != e.View.AutomationId)
        {
            e.NativeView.AccessibilityIdentifier = e.View.AutomationId;
        }
    };

    LoadApplication(new App());

    return base.FinishedLaunching(app, options);
}