使用 XAML 的 NavigationPage 流程

App.xaml.cs 檔案（App.xaml 檔案是預設的，所以跳過）

using Xamrin.Forms

namespace NavigationApp
{
    public partial class App : Application
    {
        public static INavigation GlobalNavigation { get; private set; }

        public App()
        {
            InitializeComponent();
            var rootPage = new NavigationPage(new FirstPage());

            GlobalNavigation = rootPage.Navigation;

            MainPage = rootPage;
        }
    }
}

FirstPage.xaml 檔案

<?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="NavigationApp.FirstPage"
    Title="First page">
    <ContentPage.Content>
        <StackLayout>
            <Label
                Text="This is the first page" />
            <Button
                Text="Click to navigate to a new page" 
                Clicked="GoToSecondPageButtonClicked"/>
            <Button
                Text="Click to open the new page as modal" 
                Clicked="OpenGlobalModalPageButtonClicked"/>
        </StackLayout>
    </ContentPage.Content>
</ContentPage>

在某些情況下，你需要開啟不在當前導航中但在全域性導航中的新頁面。例如，如果當前頁面包含底部選單，則在當前導航中按下新頁面時將顯示該選單。如果你需要在隱藏底部選單和其他當前頁面內容的整個可見內容上開啟頁面，則需要將新頁面作為模式推送到全域性導航中。請參閱 App.GlobalNavigation 屬性和以下示例。

FirstPage.xaml.cs 檔案

using System;
using Xamarin.Forms;

namespace NavigationApp
{
    public partial class FirstPage : ContentPage
    {
        public FirstPage()
        {
            InitializeComponent();
        }

        async void GoToSecondPageButtonClicked(object sender, EventArgs e)
        {
            await Navigation.PushAsync(new SecondPage(), true);
        }

        async void OpenGlobalModalPageButtonClicked(object sender, EventArgs e)
        {
            await App.GlobalNavigation.PushModalAsync(new SecondPage(), true);
        }
    }
}

SecondPage.xaml 檔案（xaml.cs 檔案是預設的，所以跳過）

<?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="NavigationApp.SecondPage"
    Title="Second page">
    <ContentPage.Content>
        <Label
            Text="This is the second page" />
    </ContentPage.Content>
</ContentPage>