protected override void OnElementChanged(ElementChangedEventArgs <PageViewContainer> e)
{
base.OnElementChanged(e);
var pageViewContainer = e.NewElement as PageViewContainer;
if (_viewControllerContainer != null)
{
_viewControllerContainer.ViewController = null;
_viewControllerContainer = null;
}
if (e.NewElement != null)
{
_viewControllerContainer = new ViewControllerContainer(Bounds);
SetNativeControl(_viewControllerContainer);
}
}
void ChangePage(Page page)
{
if (_currentPage == page)
{
return;
}
//TODO call page dissapaering/appearing methods
if (page != null)
{
var pageRenderer = page.GetRenderer();
UIViewController viewController = null;
if (pageRenderer?.ViewController != null)
{
viewController = pageRenderer.ViewController;
}
else
{
viewController = page.CreateViewController();
}
var parentPage = Element.GetParentPage();
var renderer = parentPage.GetRenderer();
if (_viewControllerContainer == null)
{
_viewControllerContainer = new ViewControllerContainer(Bounds);
SetNativeControl(_viewControllerContainer);
}
_viewControllerContainer.ParentViewController = renderer.ViewController;
_viewControllerContainer.ViewController = viewController;
_currentPage = page;
FixPageLayouts();
SetNeedsLayout();
}
else
{
_viewControllerContainer = null;
}
}