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UWP/C#:如果在Web视图中打开了某个html文件,则显示后退按钮

windows-10-universal windows-10 uwp visual-studio c#

Ivan S. · 技术社区 · 7 年前

我正在从通用Windows平台的Cordova应用程序进行移植。此时,我基本上创建了一个容器,其中显示本地html文件(它们也是从Cordova应用程序移植的)。现在,我想在窗口的左上角添加一个后退按钮,就像任何UWP应用程序一样。为此,我使用以下说明:

SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Visible;

它工作得很好,但我希望只有当某个html文件显示在webview中时,此按钮才会出现。应该是这样的逻辑:

1) If certain_file.html is loaded
1.1) Show the back button
2) Else
2.1) Hide the back button

我正在使用Visual Studio和Visual C#。你知道我该怎么做吗?

谢谢

3 回复 | 直到 7 年前

Xie Steven 7 年前

您可以使用 DOMContentLoaded 事件来决定是否显示“后退”按钮。

例如:

<WebView DOMContentLoaded="WebView_DOMContentLoaded" Source="ms-appx-web:///HTMLPage1.html"></WebView>

private void WebView_DOMContentLoaded(WebView sender, WebViewDOMContentLoadedEventArgs args)
{
    if (args.Uri.LocalPath == "/HTMLPage1.html")
    {
            SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Visible;
    }
    else
    {
            SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Collapsed;
    }
}

Ivan S. 7 年前

@谢泽维尔-MSFT这是主页。xaml

<Page
x:Class="Project_Onome.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Project_Onome"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

<Grid>
    <WebView x:Name="OnomeWebContainer"/>
    <WebView HorizontalAlignment="Center" VerticalAlignment="Center"/>
    <WebView Source="ms-appx-web:///www/index.html"/>
    <WebView DOMContentLoaded="OnomeWebContainer_DOMContentLoaded"/>
</Grid>

这是主页。xaml。cs公司

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Core;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

namespace Project_Onome
{
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
            WebView OnomeWebContainer = new WebView();
            OnomeWebContainer.DOMContentLoaded += OnomeWebContainer_DOMContentLoaded;
        }
    private void OnomeWebContainer_DOMContentLoaded(WebView sender, WebViewDOMContentLoadedEventArgs args)
    {
        if (args.Uri.LocalPath == "/security_auth.html")
        {
            SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Visible;
        }
        else
        {
            SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Collapsed;
        }
    }
}

}

Ivan S. 7 年前

更新的代码,现在一切正常!

1) 主页面。xaml

<WebView Name="OnomeWebContainer" Source="ms-appx-web:///www/index.html" DOMContentLoaded="OnomeWebContainer_DOMContentLoaded"></WebView>

2) 主页面。xaml。cs公司

private void OnomeWebContainer_DOMContentLoaded(WebView sender, WebViewDOMContentLoadedEventArgs args)
    {
        if (args.Uri.LocalPath == "/www/security_auth.html")
        {
            SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Visible;
        }
        else
        {
            SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Collapsed;
        }
    }

感谢谢泽维尔的帮助!:)