Xamarin.Forms Custom Label

Today, I am creating another new post in which I am going to tell you how to customize the button in Xamarin.Forms. So, let's start.

We will first create a class with a name as "CustomLabel" and then, we will write a code in C #.

public class CustomLabel : Label
  {
      public static readonly BindableProperty CurvedCornerRadiusProperty =
            BindableProperty.Create(
                nameof(CurvedCornerRadius),
                typeof(double),
                typeof(CustomLabel),
                12.0);

      public double CurvedCornerRadius
      {
          get { return (double)GetValue(CurvedCornerRadiusProperty); }
          set { SetValue(CurvedCornerRadiusProperty, value); }
      }

      public static readonly BindableProperty CurvedBackgroundColorProperty =
          BindableProperty.Create(
              nameof(CurvedCornerRadius),
              typeof(Color),
              typeof(CustomLabel),
              Color.Default);

      public Color CurvedBackgroundColor
      {
          get { return (Color)GetValue(CurvedBackgroundColorProperty); }
          set { SetValue(CurvedBackgroundColorProperty, value); }
      }
  }

Now, we can write some code in Android project for setting the radius and background color.

[assembly: ExportRenderer(typeof(CustomLabel), typeof(CurvedLabelRenderer))]
namespace XYZApp.Droid
{
    public class CurvedLabelRenderer : LabelRenderer
    {
        private GradientDrawable _gradientBackground;
        protected override void OnElementChanged(ElementChangedEventArgs<Label> e)
        {
            base.OnElementChanged(e);
            var view = (CustomLabel)Element;
            if (view == null) return;
            // creating gradient drawable for the curved background
            _gradientBackground = new GradientDrawable();
            _gradientBackground.SetShape(ShapeType.Rectangle);
            _gradientBackground.SetColor(view.CurvedBackgroundColor.ToAndroid());

            // Thickness of the stroke line
            _gradientBackground.SetStroke(4, view.CurvedBackgroundColor.ToAndroid());

            // Radius for the curves
            _gradientBackground.SetCornerRadius(DpToPixels(this.Context,
                Convert.ToSingle(view.CurvedCornerRadius)));

            // set the background of the label
            Control.SetBackground(_gradientBackground);
        }
        //Px to Dp Conver
        public static float DpToPixels(Context context, float valueInDp)
        {
            DisplayMetrics metrics = context.Resources.DisplayMetrics;
            return TypedValue.ApplyDimension(ComplexUnitType.Dip, valueInDp, metrics);
        }
    }
}

Then, we will create the same in iOS project also.

[assembly: ExportRenderer(typeof(CustomLabel), typeof(CurvedLabelRenderer))]
namespace XYZApp.iOS
{
    public class CurvedLabelRenderer : LabelRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<Label> e)
        {
            base.OnElementChanged(e);
            if (e.NewElement != null)
            {
                var _xfViewReference = (CustomLabel)Element;
                this.Layer.CornerRadius = (float)_xfViewReference.CurvedCornerRadius;
                this.Layer.BackgroundColor = _xfViewReference.CurvedBackgroundColor.ToCGColor();
            }
        }
    }
}

Now, again, please make sure to add a view reference.....

xmlns:local="clr-namespace:CustomLabelApp"

Then, write the XAML code in main page.

<StackLayout Padding="20">
            <control:CustomLabel FontSize="14.5"
                                      CurvedBackgroundColor="#6DB040"
                                      TextColor="White"
                                      Text="Custom Label"
                                      HorizontalOptions="FillAndExpand"
                                      CurvedCornerRadius="16"
                                      HeightRequest="40"
                                      VerticalTextAlignment="Center"
                                      HorizontalTextAlignment="Center"/>
            <Label Text="Simple Label"
               HeightRequest="40"
               VerticalTextAlignment="Center"
               BackgroundColor="Gray"
               HorizontalTextAlignment="Center"/>
        </StackLayout>

You should have your Custom Label working!!

Features of CustomLabel controls

1. Custom Curved Background Color Property=(CurvedBackgroundColor="#24C4FF")
2. Custom Curved Corner Radius Property=(CurvedCornerRadius="4")

For complete source code, click here.