Question

我对c＃和Xamarin很新，我刚遇到一个问题。我似乎无法在导航页面上设置后退按钮标题。香港专业教育学院尝试使用静态SetBackButtonTitle方法，但似乎没有将后退按钮设置为我想要的标题，这是 '测试'，但它给了我'默认'标题，即“返回”。

        // The root page of your application
        var content = new ContentPage();


        var CompanyName = new Label();
        CompanyName.HorizontalTextAlignment = TextAlignment.Center;
        CompanyName.Text = "Test";

        var NextPage = new Button();
        NextPage.Text = "Next Page";
        NextPage.Font = Font.SystemFontOfSize(NamedSize.Large);
        NextPage.BorderWidth = 1;
        NextPage.HorizontalOptions = LayoutOptions.Center;
        NextPage.VerticalOptions = LayoutOptions.CenterAndExpand;

        var layout = new StackLayout();
        layout.VerticalOptions = LayoutOptions.CenterAndExpand;
        layout.Children.Add(CompanyName);
        layout.Children.Add(NextPage);

        content.Content = layout;

        var content2 = new ContentPage();

        var navigation = new NavigationPage(content);
        NavigationPage.SetHasBackButton(navigation,true);
        NavigationPage.SetBackButtonTitle(navigation,"Test");

        NextPage.Clicked += NextPageClicked;
        async  void NextPageClicked(object sender, EventArgs e)
        {
            await navigation.PushAsync(content2);
        }

        MainPage = navigation;



    }

Answer 1

如果要在第二页中更改后退按钮的标题（位于导航栏左侧），则应以第一页作为参数调用方法SetBackButtonTitle。因此，请将NavigationPage.SetBackButtonTitle(navigation,"Test");修改为NavigationPage.SetBackButtonTitle(content,"Test");

Answer 2

对于使用Xamarin.Forms WPF的用户，如果要更改后退按钮标题，可以执行以下操作：

final IFrameElement _iframeElement = IFrameElement();
_iframeElement.src = "https://index.hu/";
_iframeElement.style.border = 'none';
// ignore: undefined_prefixed_name
ui.platformViewRegistry.registerViewFactory(
  'iframeElement',
  (int viewId) => _iframeElement,
);
Widget _iframeWidget;
_iframeWidget = HtmlElementView(
  key: UniqueKey(),
  viewType: 'iframeElement',
);
return Stack(
  children: <Widget>[
    IgnorePointer(
      ignoring: true,
      child: Center(
        child: _iframeWidget,
      ),
    ),
    Container(
      color: Colors.transparent,
    ),
  ],
);

在Xamarin Forms C＃上设置后退按钮标题

2 个答案: