How do I clear the Navigation stack?

问题:

I have problem for Navigation in my app. I use xamarin.forms how can clean my navigation stack. No use Pop and push. Can I see my full navigation stack ?

回答1:

In the latest version of Xamarin.Forms you can see your navigation stack using

Navigation.NavigationStack

therefore you could use a

var existingPages = Navigation.NavigationStack.ToList();
foreach(var page in existingPages)
{
    Navigation.RemovePage(page);
}

This code would have to go into your code behind of a Navigation Page or something that implements INavigation.

More information Xamarin.Forms.INavigation Members

回答2:

This is a function I made to empty the stack and navigate to a specified page. (The use case was the app was de-activated during use and I need to kick the user out)

    public async Task PopAllTo(ViewModel vm)
    {
        if (vm == null) return;
        Page page = PreparePage(vm); //replace 'page' with the page you want to reset to
        if (page == null) return;
        _navigation.InsertPageBefore(page, _navigation.NavigationStack.First());
        await _navigation.PopToRootAsync();
    }

回答3:

You can try this...

    public void ResetNavigationStack()
    {
        if (_navigation != null && _navigation.NavigationStack.Count() > 0)
        {
            var existingPages = _navigation.NavigationStack.ToList();
            foreach (var page in existingPages)
            {
                _navigation.RemovePage(page);
            }
        }
    }

and BOOOM!!! that nav stack is cleared brotha!

Or if you wanna reset the modal stack

    public async Task<Page> PopAllModals()
    {
        Page root = null;

        if (_navigation.ModalStack.Count() == 0)
            return null;

        for (var i = 0; i <= _navigation.ModalStack.Count(); i++)
        {
            root = await _navigation.PopModalAsync(false);
        }
        return root;
    }

And BOOOM! those modals are gone!

回答4:

You can access the navigation stack of your application by calling: Navigation.NavigationStack.

In my opinion the best approach is to parse the navigation stack to a list and clear it:

Navigation.NavigationStack.ToList().Clear();