How to hide navigation Toolbar icon in xamarin?

Question

I want to hide navigation bar button in xamarin. how can i do that using binding. Toolbar item doesn't have "IsVisible" property.

Following is my xaml code

please help me to sort out this issue.

Answer 1

I would suggest to build a bindable ToolBoxItem. That way you can control the visibility through a view model property.

An implementation could look like that:

public class BindableToolbarItem : ToolbarItem
{
    public static readonly BindableProperty IsVisibleProperty = BindableProperty.Create(nameof(IsVisible), typeof(bool), typeof(BindableToolbarItem), true, BindingMode.TwoWay, propertyChanged: OnIsVisibleChanged);

    public bool IsVisible
    {
        get => (bool)GetValue(IsVisibleProperty);
        set => SetValue(IsVisibleProperty, value);
    }

    private static void OnIsVisibleChanged(BindableObject bindable, object oldvalue, object newvalue)
    {
        var item = bindable as BindableToolbarItem;

        if (item == null || item.Parent == null)
            return;

        var toolbarItems = ((ContentPage)item.Parent).ToolbarItems;

        if ((bool)newvalue && !toolbarItems.Contains(item))
        {
            Device.BeginInvokeOnMainThread(() => { toolbarItems.Add(item); });
        }
        else if (!(bool)newvalue && toolbarItems.Contains(item))
        {
            Device.BeginInvokeOnMainThread(() => { toolbarItems.Remove(item); });
        }
    }
}