MvvmCross CloseTo ViewModel

1
votes

In MvvmCross is there a way to ask the navigation service to close to a specific viewModel?

For example let's say I have 3 view models

A B C

I have navigated from A to B to C.

A -> B -> C

In the C view I press a Done button and would like to go back to view A.

Is there a way to do something like this in the C viewModel?

_navigationService.Close<A>(this);

1
xamarinmvvmcross
The IMvxNavigationService Close would close the specific viewmodel. Please check the link below. github.com/MvvmCross/MvvmCross/pull/3063 - Wendy Zang - MSFT
@WendyZang-MSFT Are you suggesting I simply call close for all the viewModels I wish to close in ViewModel C? - Hackmodford

1 Answers

0
votes

if you are on Xamarin.Forms (if not let me know and I'll update the answer because it's not that simple), in the IMvxNavigationService you have the ChangePresentation(...) method which uses a hint object to tell the framework what you want to do.

 Task<bool> ChangePresentation(MvxPresentationHint hint, CancellationToken cancellationToken = default(CancellationToken));

Here you have the different out-of-the-box hints that the framework provides.

To address your issue you can just use MvxPopPresentationHint:

_navigationService.ChangePresentation(new MvxPopPresentationHint(typeof(A)));

or if A is your root ViewModel, you can just use MvxPopToRootPresentationHint:

_navigationService.ChangePresentation(new MvxPopToRootPresentationHint());

HIH