EventAggregator

SomarPage.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"
    x:Class="XamarinFormsEventAggregator.SomarPage">
    <ContentPage.Content>
        <StackLayout>
        <Frame BackgroundColor="#2196F3" Padding="24" CornerRadius="0">
            <Label Text="EventAggregator" HorizontalTextAlignment="Center" TextColor="White" FontSize="36"/>
        </Frame>
        <Label Text="A Soma das duas telas vai ser igual?" FontSize="Title" Padding="30,10,30,10"/>
        <Label Text="{Binding Texto}" FontSize="16" Padding="30,0,30,0"/>
        <Button Text="Somar mais 1" Command="{Binding SomarCommand}"></Button>
      
        </StackLayout>
    </ContentPage.Content>
</ContentPage>