How do I change the size of an image for a ToolbarItem

BillGreer

I have tried changing the actual image size of every SendMessage.png in my Xamarin Forms drawable folders yet the image renders the same. Can I programmatically change the icon in my xaml code below?

<ContentPage.ToolbarItems>
    <ToolbarItem
        Icon="SendMessage.png" 
        Text="Contact Us"
        Clicked="SendMessageClicked" />
    </ContentPage.ToolbarItems>

LandLu

You have to implement it on each platform.
The renderer on iOS:

[assembly: ExportRenderer(typeof(MainPage), typeof(CustomPageRenderer))]
namespace App.iOS
{
    public class CustomPageRenderer : PageRenderer
    {
        protected override void OnElementChanged(VisualElementChangedEventArgs e)
        {
            base.OnElementChanged(e);
        }

        public override void ViewWillAppear(bool animated)
        {
            base.ViewWillAppear(animated);

            UIViewController vc = NavigationController.TopViewController;

            List<UIBarButtonItem> items = new List<UIBarButtonItem>();
            int i = ((ContentPage)Element).ToolbarItems.Count - 1;
            foreach (UIBarButtonItem item in vc.NavigationItem.RightBarButtonItems)
            {
                ToolbarItem toolBarItem = ((ContentPage)Element).ToolbarItems[i];

                UIButton btn = new UIButton(UIButtonType.Custom);
                btn.SetImage(item.Image, UIControlState.Normal);
                btn.Frame = new CGRect(0, 0, 10, 10);
                btn.TouchUpInside += (sender, args) => 
                {
                    item.Target.PerformSelector(item.Action, null, 0.0);
                };

                UIBarButtonItem customItem = new UIBarButtonItem(btn);
                customItem.CustomView.WidthAnchor.ConstraintEqualTo(10).Active = true;
                customItem.CustomView.HeightAnchor.ConstraintEqualTo(10).Active = true;
                items.Add(customItem);

                i--;
            }

            vc.NavigationItem.RightBarButtonItems = items.ToArray();
        }
    }
}

On Android, you need to add this values in the styles.xml:

<style name="MainTheme.Base" parent="Theme.AppCompat.Light.DarkActionBar">
  <!--...-->  

  <item name="android:actionButtonStyle">@style/myActionButtonStyle</item>
  <item name="actionButtonStyle">@style/myActionButtonStyle</item>
</style> 

<style name="myActionButtonStyle" parent="Widget.AppCompat.ActionButton">
  <item name="android:minWidth">10dp</item>
  <item name="android:maxWidth">10dp</item>
  <item name="android:width">10dp</item>
</style>