CODEWITHSUNDEEP
c#xamarintaskmvvmcross
eL-Prova
eL-Prova

Reputation: 1094

MvvmCross show view before going further

I have an application where I can use popup views over the normal windows. For getting the data the user needs to login so I have a token. Has anyone experience with the way if there is no token, show first a view, then go further where you was heading to?

To make it more clear:

public void Init()
{
    if (!CheckToken())
    {
       Task.Run(() => ShowViewModel<InsertPasswordViewModel>())
                    .ContinueWith(t => GetData());
    }
    else
    {
        //Do your thing
        GetData();
    }
 }

The problem now is that the task is run so view is shown and immediately starts GetData but he has no token and crashes.

Any ideas or fixes are welcome

Upvotes: 0

Views: 165

Answers (1)

Cheesebaron
Cheesebaron

Reputation: 24460

You shouldn't do navigation in Init. You are essentially navigating away from a page you are in the middle of navigating to. The navigation isn't finished executing when Init is called.

You are not getting a result from ShowViewModel either, so you can't rely on that returning anything when you are done with everything in InsertPasswordViewModel.

What you are probably looking for is navigating to your ViewModel with some kind of parameter telling where you came from. Then let InsertPasswordViewModel use that parameter to navigate back once password is OK. You probably want to modify the View hierarchy too, which you can do through a custom presenter and a set of presentation hints.

Upvotes: 1

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