public override UIViewController GetPreviousViewController(UIKit.UIPageViewController pageViewController, UIViewController referenceViewController)
{
CurrentPage = referenceViewController as UIPageViewControllerItem;
if (CurrentPage != null) {
if (OldPage != null)
OldPage.IsActive = false;
CurrentPage.IsActive = true;
OldPage = CurrentPage;
if (CurrentPage.ListIndex == 0) {
return null;
} else {
return _pages [CurrentPage.ListIndex - 1];
}
} else
return null;
}
public override UIViewController GetNextViewController(UIKit.UIPageViewController pageViewController, UIViewController referenceViewController)
{
CurrentPage = referenceViewController as UIPageViewControllerItem;
if (CurrentPage != null) {
if (CurrentPage.ListIndex != 0) {
if (OldPage != null)
OldPage.IsActive = false;
CurrentPage.IsActive = true;
OldPage = CurrentPage;
}
if (CurrentPage.ListIndex == _pages.Count - 1) {
return null;
}
return _pages [(CurrentPage.ListIndex + 1)];
} else
return null;
}