Example how to implement a token generator in Xamarin.Forms Applications. - http://julianocustodio.com/token

MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:DemoToken"
             x:Class="DemoToken.MainPage">

    <StackLayout Padding="10">
        <Label Text="{Binding Codigo}" 
               FontSize="64" TextColor="Blue" 
               HorizontalTextAlignment="Center" 
               HorizontalOptions="CenterAndExpand"/>

        <Label Text="{Binding Segundos}" 
               FontSize="11" TextColor="Black" 
               HorizontalTextAlignment="Center"  
               HorizontalOptions="CenterAndExpand"/>

    </StackLayout>

</ContentPage>