Daniel Hindrikes

The label control in Xamarin.Forms does not have a FontColor property. But the control is easy to extend.

First create a new class that inherits from Label.
Create a FontColor property of type string. The value of the FontColor will in this example be an RGBA string.

public class CustomLabel : Label
    {
       
         public static readonly BindableProperty FontColorProperty = 
             BindableProperty.Create( 
                 p => p.FontColor, ""); 
 
 
         public string FontColor
         { 
             get 
             { 
                 return (string)GetValue(FontColorProperty); 
             } 
             set 
             { 
                 SetValue(FontColorProperty, value); 
             } 
         } 

    }

Next step is to write a custom renderer for each platform.

iOS

[assembly: ExportRenderer(typeof(CustomLabel), typeof(CustomLabelRenderer))]
namespace MyApp.iOS.Renderers
{
    public class CustomLabelRenderer : LabelRenderer
    {

        protected override void OnElementPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            base.OnElementPropertyChanged(sender, e);

            if(e.PropertyName == "FontColor")
            {
                var view = (CustomLabel)Element;

                var values = view.FontColor.Split(',');

                Control.TextColor = UIColor.FromRGBA(int.Parse(values[0]), int.Parse(values[1]), int.Parse(values[2]), int.Parse(values[3]));
            }
        }
    }
}

Android

[assembly: ExportRenderer(typeof(CustomLabel), typeof(CustomLabelRenderer))]
namespace MyApp.Android.Renderers
{
    public class CustomLabelRenderer : LabelRenderer
    {

        protected override void OnElementPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            base.OnElementPropertyChanged(sender, e);

            if(e.PropertyName == "FontColor")
            {
                var view = (CustomLabel)Element;

                var values = view.FontColor.Split(',');

                var color = Color.Argb(int.Parse(values[3]),int.Parse(values[0]), int.Parse(values[1]), int.Parse(values[2]));
            
                Control.SetTextColor(color);            
            }
        }
    }
}

Windows Phone

[assembly: ExportRenderer(typeof(CustomLabel), typeof(CustomLabelRenderer))]
namespace MyApp.WinPhone.Renderers
{
    public class CustomLabelRenderer : LabelRenderer
    {

        protected override void OnElementPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            base.OnElementPropertyChanged(sender, e);

            if(e.PropertyName == "FontColor")
            {
                var view = (CustomLabel)Element;

                var values = view.FontColor.Split(',');
                Control.Foreground = new SolidColorBrush(System.Windows.Media.Color.FromArgb(byte.Parse(values[0]), byte.Parse(values[1]), byte.Parse(values[2]), byte.Parse(values[3])));
            }
        }
    }
}

To use the custom label in XAML you need to declare the namespace.

Then you can use the control i XAML like this: