Create an ICommand Bindable property on Xamarin Forms

Question

I have a custom checkbox control that I created with an ICommand property and the corresponding bindable property (my checkbox is a Xamarin.Forms XAML Page), the code is:

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Answer 1

Since the original answer is now obsolete, here is the new method:

using System.Windows.Input;

public partial class MyControlExample : ContentView
{
    // BindableProperty implementation
    public static readonly BindableProperty CommandProperty = 
        BindableProperty.Create(nameof(Command), typeof(ICommand), typeof(MyControlExample), null);

    public ICommand Command
    {
        get { return (ICommand)GetValue(CommandProperty); }
        set { SetValue(CommandProperty, value); }
    }

    // Helper method for invoking commands safely
    public static void Execute(ICommand command)
    {
        if (command == null) return;
        if (command.CanExecute(null))
        {
            command.Execute(null);
        }
    }

    public MyControlExample()
    {
        InitializeComponent();
    }

    // this is the command that gets bound by the control in the view
    // (ie. a Button, TapRecognizer, or MR.Gestures)
    public Command OnTap => new Command(() => Execute(Command));
}

Answer 2

Something like that (pseudocode):

public class YourClassName : View
{
    public YourClassName()
    {
        var gestureRecognizer = new TapGestureRecognizer();

        gestureRecognizer.Tapped += (s, e) => {
            if (Command != null && Command.CanExecute(null)) {
                Command.Execute(null);
            }
        };

        var label = new Label();
        label.GestureRecognizers.Add(gestureRecognizer);
    }

    public static readonly BindableProperty CommandProperty =
    BindableProperty.Create<YourClassName, ICommand>(x => x.Command, null);

    public ICommand Command
    {
        get { return (ICommand)GetValue(CommandProperty); }
        set { SetValue(CommandProperty, value); }
    }
}