I am trying to pass parameters back to a view using GoBackAsync(). All my view modelas inherit a BaseViewModel which inherits INavigatedAware.
The navigation path to the last page where I go back is as follows:
NavigationPage/TabbedView -> ViewA -> ViewB -> ViewC
ViewC is a ListView and when I select an item from the view GoBackAsync() is called passing the item object back to the previous view.
Actual Behaviour:
When GoBackAsync() is called I am taken from ViewC to ViewB to ViewA.
Expected Behaviour:
When GoBackAsync() is called I land on View B from View C.
ViewAViewModel
private async void ViewAToViewB()
{
await _navigationService.NavigateAsync("ViewB", useModalNavigation:false);
}
ViewBViewModel
private async void ViewAToViewC()
{
await _navigationService.NavigateAsync("ViewC", useModalNavigation:false);
}
public override void OnNavigatedTo(INavigationParameters parameters)
{
if (parameters.Count > 0)
{
var myString = parameters.GetValue<string>("testParam");
}
}
ViewCViewModel
private async void NavigateBackToViewB()
{
var navigationParams = new NavigationParameters();
navigationParams.Add("testParam", "Adam Sandler");
await _navigationService.GoBackAsync(navigationParams, useModalNavigation:false);
}
Temporary fix
In ViewAViewModel.cs I have had to prefix ViewB with NavigationPage/ and then set ViewB.xaml and ViewC.xaml to have NavigationPage.HasNavigationBar = false to stop 2 navigations bars showing.
This is the only way my GoBackAsync() goes to ViewB from ViewC and not all the way back to ViewA.
