protected virtual void OnRemoveRequested(NavigationRequestedEventArgs e)
{
var page = e.Page;
var renderer = Platform.GetRenderer(page);
var viewController = renderer?.ViewController;
if (viewController == null && _trackers.ContainsKey(page))
{
viewController = _trackers[page].ViewController;
}
if (viewController != null)
{
if (viewController == TopViewController)
{
e.Animated = false;
OnPopRequested(e);
}
if (ViewControllers.Contains(viewController))
{
ViewControllers = ViewControllers.Remove(viewController);
}
DisposePage(page);
}
}
void DisposePage(IPage page, bool calledFromDispose = false)
{
if (_trackers.TryGetValue(page, out var tracker))
{
if (!calledFromDispose && tracker.ViewController != null && ViewControllers.Contains(tracker.ViewController))
{
ViewControllers = ViewControllers.Remove(_trackers[page].ViewController);
}
_trackers.Remove(page);
}
}
public nfloat OffsetForChildViewController(UIViewController viewController)
{
if (!ViewControllers.Contains(viewController))
{
//Throw exception view controller not contained in tab strip
throw new ViewControllerNotFoundException("The view controller is not contained in the tab strip");
}
else
{
int index = Array.IndexOf(ViewControllers, viewController);
return(OffsetForChildIndex((uint)index));
}
}
public override UIViewController[] PopToViewController(UIViewController viewController, bool animated)
{
if (VisibleViewController != viewController)
{
regularPop = TopViewController != viewController;
if (ViewControllers.Contains(viewController))
{
return(base.PopToViewController(viewController, animated));
}
else
{
return(PopToRootViewController(animated));
}
}
return(null);
}
void DisposePage(Page page, bool calledFromDispose = false)
{
if (_trackers.TryGetValue(page, out var tracker))
{
if (!calledFromDispose && tracker.ViewController != null && ViewControllers.Contains(tracker.ViewController))
{
ViewControllers = ViewControllers.Remove(_trackers[page].ViewController);
}
tracker.Dispose();
_trackers.Remove(page);
}
var renderer = Platform.GetRenderer(page);
if (renderer != null)
{
renderer.Dispose();
page.ClearValue(Platform.RendererProperty);
}
}