public static void ConfigureBackButton(this UIViewController controller, Link backLink, Pane outputPane)
{
var backButton = new UIBarButtonItem(string.IsNullOrEmpty(controller.NavigationItem.Title) ?
TouchFactory.Instance.GetResourceString("Back") : controller.NavigationItem.Title, UIBarButtonItemStyle.Plain, null);
controller.NavigationItem.BackBarButtonItem = backButton;
controller.NavigationItem.LeftBarButtonItem = null;
var stack = controller.NavigationController as IHistoryStack ?? PaneManager.Instance.FromNavContext(outputPane, PaneManager.Instance.CurrentTab);
if (stack != null && !stack.CanGoBack())
{
controller.NavigationItem.SetHidesBackButton(true, false);
}
else if (backLink == null && controller.NavigationItem.HidesBackButton)
{
controller.NavigationItem.HidesBackButton = false;
}
if (backLink != null)
{
var weak = new WeakReference(controller);
backButton = controller.CreateButton(backLink);
backButton.Clicked += delegate(object sender, EventArgs e)
{
var historyStack = (weak.Target as UIViewController)?.NavigationController as IHistoryStack;
if (historyStack != null)
{
historyStack.HandleBackLink(backLink, outputPane);
}
};
controller.NavigationItem.SetHidesBackButton(true, false);
controller.NavigationItem.SetLeftBarButtonItem(backButton, false);
}
var popover = controller.NavigationController as PopoverNavigationController;
if (popover != null)
{
popover.SetCloseButton(controller);
}
}