Move toolbar items with priority = 0 to LeftBarButtonItems on iOS with Xamarin Forms. Originally written by Murally at http://forums.xamarin.com/discussion/21004/navigation-bar-left-toolbar-button

ExtendedPageRenderer.cs

[assembly: ExportRenderer(typeof(ContentPage), typeof(ExtendedPageRenderer))]

public class ExtendedPageRenderer : PageRenderer
{
    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();

        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 && info.Priority != 0)
            {
                return;
            }

            rightNativeButtons.Remove(nativeItem);
            leftNativeButtons.Add(nativeItem);
        });

        navigationItem.RightBarButtonItems = rightNativeButtons.ToArray();
        navigationItem.LeftBarButtonItems = leftNativeButtons.ToArray();
    }

}

How about this such as render for Android ? is possible to Arranged toolbar item to Left even order as secondary ?

@vahidkadivar +1