FreshMVVM Navigation throws an exception from a Modal Page

Dan_deWaal · January 2020

I am using a LocalNotification plugin(nuget) to generate a Phone Notification upon an event, which works fine.
If the user navigates to a page which lists the notifications and selects one, it goes to the NotificationPageModel.cs page.
From there they press a button which navigates them away, which works as long as it is manually navigated to.

If the user clicks on the phone's notification (app.xaml.cs:OnLocalNotificationTapped) then when trying to navigate away,
it generates a FreshTinyIoC.TinyIoCResolutionException.

How can I navigate away from the page when the user has clicked the notification (masterDetailNav.Navigation.PushModalAsync(npage);) ?

Relevant versions:
Xamarin.Forms v3.6.0.264807
FreshMvvm v3.0.0
Plugin.LocalNotification by Thudugala v4.0.5

App.xaml.cs:
        void OnLocalNotificationTapped(NotificationTappedEventArgs e)
        {
            var _logger = FreshMvvm.FreshIOC.Container.Resolve<ILoggingService>();
            _logger.Info("Pressed notification: {0}", e.Data);
            Notification notification = new Notification();
            if (string.IsNullOrWhiteSpace(e.Data))
            {
                return;
            }
            else
            {
                notification = JsonConvert.DeserializeObject<Notification>(e.Data);
            }

            //CoreMethods.PushPageModel<NotificationPageModel>(notification); //cant find coremethods
            var npage = FreshPageModelResolver.ResolvePageModel<NotificationPageModel>(notification);
            masterDetailNav.Navigation.PushModalAsync(npage);
        }

NotificationPageModel.cs:
        public async void Cancel()
        {
            _logger.Info("Notification {0} Cancel: {1}", Notification.Gateway, Notification.TimeStamp);

            //Navigate away from page
            //await CoreMethods.PopPageModel(); //this only works if manually navigated to
            //attempt #1
            await CoreMethods.PushPageModel<HomePageModel>();
        }

        public async void Remove()
        {
            _logger.Info("Notification {0} Remove: {1}", Notification.Gateway, Notification.TimeStamp);

            //Remove notification
            try
            {
                _user.Notifications.Remove(Notification);
            }
            catch (Exception ex)
            {
                _logger.Warn("Remove Notification: {0}", ex.Message);
            }

            //Navigate away from page
            //await CoreMethods.PopPageModel(); //this only works if manually navigated to
            //attempt #2
            var hpage = FreshPageModelResolver.ResolvePageModel<HomePageModel>();
            await CoreMethods.PushPageModelWithNewNavigation<HomePageModel>(hpage);
        }

FreshTinyIoC.TinyIoCResolutionException
Message=Resolve failed: IFreshNavigationService
Source=mscorlib
StackTrace:
at FreshTinyIoC.FreshTinyIoCContainer.ResolveInternal (FreshTinyIoC.FreshTinyIoCContainer+TypeRegistration registration, FreshTinyIoC.NamedParameterOverloads parameters, FreshTinyIoC.ResolveOptions options) [0x000f7] in C:\Projects\FreshMvvm\src\FreshIOC\FreshTinyIOC.cs:3142
at FreshTinyIoC.FreshTinyIoCContainer.Resolve (System.Type resolveType, System.String name) [0x00000] in C:\Projects\FreshMvvm\src\FreshIOC\FreshTinyIOC.cs:1211
at FreshTinyIoC.FreshTinyIoCContainer.Resolve[ResolveType] (System.String name) [0x00000] in C:\Projects\FreshMvvm\src\FreshIOC\FreshTinyIOC.cs:1332
at FreshMvvm.FreshTinyIOCBuiltIn.Resolve[ResolveType] (System.String name) [0x00000] in C:\Projects\FreshMvvm\src\FreshMvvm\FreshTinyIOCBuiltIn.cs:31
at FreshMvvm.PageModelCoreMethods.PushNewNavigationServiceModal (FreshMvvm.IFreshNavigationService newNavigationService, FreshMvvm.FreshBasePageModel[] basePageModels, System.Boolean animate) [0x00073] in C:\Projects\FreshMvvm\src\FreshMvvm\PageModelCoreMethods.cs:178
at FreshMvvm.PageModelCoreMethods.PushPageModelWithNewNavigation[T] (System.Object data, System.Boolean animate) [0x00060] in C:\Projects\FreshMvvm\src\FreshMvvm\PageModelCoreMethods.cs:235
at cdaxrobot.PageModels.NotificationPageModel.Go () [0x00225] in C:\Work\RobotApp\App\cdaxrobot\cdaxrobot\cdaxrobot\PageModels\NotificationPageModel.cs:113
at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.b__7_0 (System.Object state) [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2019-08/android/release/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1021
at Android.App.SyncContext+<>c__DisplayClass2_0.b__0 () [0x00000] in <11f101b564894ca7af6c482ddc51c698>:0
at Java.Lang.Thread+RunnableImplementor.Run () [0x00008] in <11f101b564894ca7af6c482ddc51c698>:0
at Java.Lang.IRunnableInvoker.n_Run (System.IntPtr jnienv, System.IntPtr native__this) [0x00009] in <11f101b564894ca7af6c482ddc51c698>:0
at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.41(intptr,intptr)

Dan_deWaal · January 2020

Thank you for the response.
I managed to fix it by creating a new NavigationContainer:

notificationPage = FreshMvvm.FreshPageModelResolver.ResolvePageModel<NotificationPageModel>(true);
notificationContainer = new FreshNavigationContainer(notificationPage, Models.Constants.NotificationContainer);

void OnLocalNotificationTapped(NotificationTappedEventArgs e)
{
    MainPage = notificationContainer;
}

and then in the page I do this:

if (CameFromNotification == true)
{
    _logger.Debug("Navigating back to MainContainer");
    CoreMethods.SwitchOutRootNavigation(Models.Constants.MainContainer);
}
else
{
    _logger.Debug("Navigating by popping the stack");
    await CoreMethods.PopPageModel();
}

Yelinzh · January 2020

How can I navigate away from the page when the user has clicked the notification

Using Navigation.PushModalAsync (page) method could navigate to a modal page. FreshMvvm provides an interface named IFreshNavigationService which may help to implement the navigation.

Check the link:
https://michaelridland.com/xamarin/implementing-freshmvvm-mvvm-xamarin-forms/

Dan_deWaal · January 2020

Thank you for the response.
I managed to fix it by creating a new NavigationContainer:

notificationPage = FreshMvvm.FreshPageModelResolver.ResolvePageModel<NotificationPageModel>(true);
notificationContainer = new FreshNavigationContainer(notificationPage, Models.Constants.NotificationContainer);

void OnLocalNotificationTapped(NotificationTappedEventArgs e)
{
    MainPage = notificationContainer;
}

and then in the page I do this:

if (CameFromNotification == true)
{
    _logger.Debug("Navigating back to MainContainer");
    CoreMethods.SwitchOutRootNavigation(Models.Constants.MainContainer);
}
else
{
    _logger.Debug("Navigating by popping the stack");
    await CoreMethods.PopPageModel();
}

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