Is there a simple way to run code in the ViewModel after the view has been made visible?
The N=42 video - http://slodge.blogspot.co.uk/2013/11/n42-is-my-viewmodel-visible-can-i-kill.html - introduces an IVisible
interface that you can add to your ViewModel
- it's your job to call this from your View
- but this is easy to do on each platform. For example,, on iOS it is done using ViewDidAppear
/ViewDidDisappear
in https://github.com/MvvmCross/NPlus1DaysOfMvvmCross/blob/master/N-42-Lifecycles/Lifecycle.Touch/Views/FirstView.cs
protected IVisible VisibleViewModel
{
get { return base.ViewModel as IVisible; }
}
public override void ViewDidAppear(bool animated)
{
base.ViewDidAppear(animated);
VisibleViewModel.IsVisible(true);
}
public override void ViewDidDisappear(bool animated)
{
base.ViewDidDisappear(animated);
VisibleViewModel.IsVisible(false);
}