PRISM Xamarin - Working with tabbed pages (IActiveAware) - xaml

Question

I have tab pages implementing different views, but I cannot initialize each of the tabs when navigating.
<TabbedPage.Children>
<tabPages:Page1/>
<tabPages:Page2/>
<tabPages:Page3/>
</TabbedPage.Children>
So what I did was to use IActiveAware as prism documentation suggested to know which tab page is currently active. So I have this class:
public abstract class TabbedChildViewModelBase : BaseViewModel, IActiveAware, INavigationAware, IDestructible
protected bool IsInitalized { get; set; }
private bool _IsActive;
public bool IsActive
{
get
{
return _IsActive;
}
set
{
SetProperty(ref _IsActive, value, RaiseIsActiveChanged);
}
}
public event EventHandler IsActiveChanged;
public virtual void OnNavigatingTo(NavigationParameters parameters)
{
}
protected virtual void RaiseIsActiveChanged()
{
IsActiveChanged?.Invoke(this, EventArgs.Empty);
}
public virtual void Destroy()
{
}
}
So each child view models inherits the child view model base:
public class Page1 : TabbedChildViewModelBase
{
public CurrentSeaServiceViewModel()
{
IsActiveChanged += HandleIsActiveTrue;
IsActiveChanged += HandleIsActiveFalse;
}
private void HandleIsActiveTrue(object sender, EventArgs args)
{
if (IsActive == false)
{
TestLabelOnly = "Test";
}
// Handle Logic Here
}
private void HandleIsActiveFalse(object sender, EventArgs args)
{
if (IsActive == true) return;
// Handle Logic Here
}
public override void Destroy()
{
IsActiveChanged -= HandleIsActiveTrue;
IsActiveChanged -= HandleIsActiveFalse;
}
}
The problem is, the child vm isn't initializing. Is there something needed in order to implement IActiveAware properly nor launching the IsActive property

Answer 1

I still used IActiveAware unfortunately, to make the childtabbedviewmodel work you need to bind the page to its own view model.
So here's what I did:
<TabbedPage.Children>
<views:ChildPage1>
<views:ChildPage1.BindingContext>
<viewModels:ChildPage1ViewModel/>
</views:ChildPage1.BindingContext>
</views:ChildPage1>
<views:ChildPage2>
<views:ChildPage2.BindingContext>
<viewModels:ChildPage2ViewModel/>
</views:ChildPage2.BindingContext>
</views:ChildPage2>
</TabbedPage.Children>
I used the property BindingContext of my views and
using IActiveAware I would also know what tab is currently active. Hope anyone helps this who finds trouble binding the child pages of a tab.