XF 进度条和指示器

<?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:App23"

             x:Class="App23.MainPage">

<StackLayout VerticalOptions="Center">

        <ProgressBar x:Name="pb" Progress="0.1"></ProgressBar>

        <ActivityIndicator x:Name="ai"></ActivityIndicator>

        <Button Text="start" Clicked="Button_Clicked"></Button>

    </StackLayout>

</ContentPage>

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using Xamarin.Forms;

namespace App23

{

    public partial class MainPage : ContentPage

    {

        public MainPage()

        {

            InitializeComponent();

        }

private void Button_Clicked(object sender, EventArgs e)

        {

            pb.ProgressTo(1, 1000, Easing.Linear);

            ai.IsRunning = !ai.IsRunning;

        }

    }

}