Xamarin Forms Switch's Toggled event not being triggered when using custom renderer

Issue

I have a Xamarin.Forms app and I have created a custom Switch as below:

public class ExtSwitch : Switch
{
   public static readonly BindableProperty SwitchOnColorProperty =
          BindableProperty.Create(nameof(SwitchOnColor),
                                  typeof(Color), typeof(ExtSwitch), Color.Default);

   public Color SwitchOnColor
   {
      get { return (Color)GetValue(SwitchOnColorProperty); }
      set { SetValue(SwitchOnColorProperty, value); }
   }

   // More codes here //
}

In My XAML I used it like:

<local:ExtSwitch Grid.Column = "2"
       IsToggled="{Binding IsToggled}" 
       Toggled="Handle_Toggled"
       SwitchThumbColor="White" 
       SwitchOnColor="Red" 
       SwitchOffColor="Gray"
       HorizontalOptions="End" 
       VerticalOptions="Center" />

In My C# code I have a Handle_Toggled method that handles what happened when the Swich is toggled. But somehow the Toggled event is not being triggered when used inside my custom switch but works perfectly when used in a normal switch.

Can someone point to me what am I missing here or what am I doing wrong?

Edit:

Custom renderer in iOS:

class ExtSwitchRenderer : SwitchRenderer
{
   protected override void OnElementChanged(ElementChangedEventArgs<Switch> e)
   {
       base.OnElementChanged(e);

       if (e.OldElement != null || e.NewElement == null) return;

       ExtSwitch s = Element as ExtSwitch;

       UISwitch sw = new UISwitch();
       sw.ThumbTintColor = s.SwitchThumbColor.ToUIColor();
       sw.OnTintColor = s.SwitchOnColor.ToUIColor();

       SetNativeControl(sw);
    }
}

Using the above code:

Using the code suggested below:

Custom renderer in Android:

public class ExtSwitchRenderer : SwitchRenderer
    {
        public ExtSwitchRenderer(Context context) : base(context) { }
        ExtSwitch s;

       protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Switch> e)
      {
        base.OnElementChanged(e);
        if (e.OldElement != null || e.NewElement == null)
            return;

        s = Element as ExtSwitch;
        if (this.Control != null)
        {
            if (this.Control.Checked)
            {
                this.Control.TrackDrawable.SetColorFilter(s.SwitchOnColor.ToAndroid(), PorterDuff.Mode.SrcAtop);
            }
            else
            {
                this.Control.TrackDrawable.SetColorFilter(s.SwitchOffColor.ToAndroid(), PorterDuff.Mode.SrcAtop);
            }
            this.Control.CheckedChange += this.OnCheckedChange;
        }
        Control.Toggle();
    }

    void OnCheckedChange(object sender, CompoundButton.CheckedChangeEventArgs e)
    {
        if (this.Control.Checked)
        {
            this.Control.ThumbDrawable.SetColorFilter(s.SwitchOnColor.ToAndroid(), PorterDuff.Mode.Multiply);
            this.Control.TrackDrawable.SetColorFilter(s.SwitchOnColor.ToAndroid(), PorterDuff.Mode.SrcAtop);
        }
        else
        {
            this.Control.ThumbDrawable.SetColorFilter(s.SwitchOffColor.ToAndroid(), PorterDuff.Mode.Multiply);
            this.Control.TrackDrawable.SetColorFilter(s.SwitchOffColor.ToAndroid(), PorterDuff.Mode.SrcAtop);
        }
    }
}

Solution

Don't set the native control, instead just update the current Control, like this:

this.Control.ThumbTintColor = s.SwitchThumbColor.ToUIColor();
this.Control.OnTintColor = s.SwitchOnColor.ToUIColor();

And theres no need to call SetNativeControl

Answered By - sme