Should ViewModel handle navigation?

Should ViewModel handle navigation?

3 Answers. Navigation should always be handled in the ViewModel. You’re on the right track with thinking that the perfect implementation of the MVVM design pattern would mean you could run your application entirely without Views, and you can’t do that if your Views control your Navigation.

How do you navigate in MVVM?

Navigating between views in WPF / MVVM

1. Step 1: Create a new WPF application.
2. Step 2: Add classes for event handling, RelayCommand etc.
3. Step 3: Create a common ViewModel interface.
4. Step 4: Create the Views.
5. Step 5: Create the ViewModel classes.

Is there a controller in MVVM?

Instead of the controller of the MVC pattern, or the presenter of the MVP pattern, MVVM has a binder, which automates communication between the view and its bound properties in the view model. The view model has been described as a state of the data in the model.

How do I use navigation in my ViewModel?

1. Create project in android studio.
2. Add dependencies for navigation components.
3. Create Navigation graph:
4. Add NavHostFragment to activity.
5. Add resources into project.
6. Organize classes with packages.
7. Create destination fragments and layouts.
8. Create model , adapter and ViewModel class.

How do I save my ViewModel data?

To efficiently save and restore UI state, use a combination of persistence, onSaveInstanceState() and ViewModels. Complex data is saved in local persistence and onSaveInstanceState() is used to store unique identifiers to that complex data. ViewModels store the complex data in memory after it is loaded.

How to create a navigation button in MVVM?

The main window layout has navigation buttons on the left handle side and a ContentControl on the right hand side to display the corresponding UserControl. Solution: In MVVM navigation can be achieve by hooking together DataTemplate with UserControl, ContentControl and corresponding ViewModel.

What should view be responsible for in MVVM?

Ideally, in View there shouldn’t be any code. In addition, as View does not have any logic in it VM would initially need to check if creating new view is needed, and – when it is – bouncing this responsibility back to View, leading to code bloat.

Can a view be a usercontrol in MVVM?

The easiest way to implement the backing property is to make it a UserControl, though some would argue that doing so violates MVVM (since the ViewModel is now dependent on a “View” class). You could make it an object, but you lose some type safety. Each view would be a UserControl in this case.

Which is the best MVVM framework for navigation?

IMHO the best choose for you is to use MVVM framework (PRISM, MMVM Light, Chinch, etc) because navigation is already implemented. If you want to create your own navigation – try DataTemplate. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question.