private async System.Threading.Tasks.Task UpdateToolbarItems()
{
await System.Threading.Tasks.Task.Delay(20);
var contentPage = this.Element as ContentPage;
if (contentPage == null || NavigationController == null)
{
return;
}
var itemsInfo = contentPage.ToolbarItems;
var navigationItem = this.NavigationController.TopViewController.NavigationItem;
var newLeftButtons = new UIBarButtonItem[] { }.ToList();
var newRightButtons = new UIBarButtonItem[] { }.ToList();
foreach (var item in itemsInfo)
{
if (item.Priority == 0)
{
newLeftButtons.Add(item.ToUIBarButtonItem());
}
else
{
newRightButtons.Add(item.ToUIBarButtonItem());
}
}
navigationItem.RightBarButtonItems = newRightButtons.ToArray();
navigationItem.LeftBarButtonItems = newLeftButtons.ToArray();
}
public override void ViewWillAppear(bool animated)
{
base.ViewWillAppear(animated);
var contentPage = this.Element as ContentPage;
if (contentPage == null || NavigationController == null)
{
return;
}
var itemsInfo = contentPage.ToolbarItems;
var navigationItem = this.NavigationController.TopViewController.NavigationItem;
var leftNativeButtons = (navigationItem.LeftBarButtonItems ?? new UIBarButtonItem[] { }).ToList();
var rightNativeButtons = (navigationItem.RightBarButtonItems ?? new UIBarButtonItem[] { }).ToList();
var newLeftButtons = new UIBarButtonItem[] { }.ToList();
var newRightButtons = new UIBarButtonItem[] { }.ToList();
rightNativeButtons.ForEach(nativeItem =>
{
// [Hack] Get Xamarin private field "item"
var field = nativeItem.GetType().GetField("_item", BindingFlags.NonPublic | BindingFlags.Instance);
if (field == null)
{
return;
}
var info = field.GetValue(nativeItem) as ToolbarItem;
if (info == null)
{
return;
}
if (info.Priority == 0)
{
newLeftButtons.Add(nativeItem);
}
else
{
newRightButtons.Add(nativeItem);
}
});
leftNativeButtons.ForEach(nativeItem =>
{
newLeftButtons.Add(nativeItem);
});
navigationItem.RightBarButtonItems = newRightButtons.ToArray();
navigationItem.LeftBarButtonItems = newLeftButtons.ToArray();
}