TitleBar.BackRequested 事件

// Register
event_token BackRequested(TypedEventHandler<TitleBar, IInspectable const&> const& handler) const;

// Revoke with event_token
void BackRequested(event_token const* cookie) const;

// Revoke with event_revoker
TitleBar::BackRequested_revoker BackRequested(auto_revoke_t, TypedEventHandler<TitleBar, IInspectable const&> const& handler) const;

public event TypedEventHandler<TitleBar,object> BackRequested;

function onBackRequested(eventArgs) { /* Your code */ }
titleBar.addEventListener("backrequested", onBackRequested);
titleBar.removeEventListener("backrequested", onBackRequested);
- or -
titleBar.onbackrequested = onBackRequested;

Public Custom Event BackRequested As TypedEventHandler(Of TitleBar, Object) 

事件類型

範例

<!-- MainWindow.xaml -->

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>
    <TitleBar Title="My App"
              IsBackButtonVisible="True"
              IsBackButtonEnabled="{x:Bind RootFrame.CanGoBack, Mode=OneWay}"
              BackRequested="TitleBar_BackRequested">
    </TitleBar>

    <NavigationView x:Name="RootNavigationView" Grid.Row="1"
                    IsBackButtonVisible="Collapsed">
        <Frame x:Name="RootFrame" />
    </NavigationView>
</Grid>

// MainWindow.xaml.cs

private void TitleBar_BackRequested(TitleBar sender, object args)
{
    if (RootFrame.CanGoBack)
    {
        RootFrame.GoBack();
    }
}

備註

當你將 標題列 控制項搭配 導航檢視 控制時，應該將導航檢視的返回按鈕替換成標題列的返回按鈕。

我們建議您：

• 把返回鍵藏在控制鍵 NavigationView 裡。 <NavigationView IsBackButtonVisible="Collapsed">
• 在控制鍵裡顯示返回鍵 TitleBar 。 <TitleBar IsBackButtonVisible="True">
• 處理這個事件才能回頭。

另請參閱

• IsBackButtonVisible
• <xref:Microsoft.UI.Xaml.Controls.TitleBar.IsBackButtonEnabled+%5bNavigationView.IsBackButtonVisible%5d(%2fwindows%2fwindows-app-sdk%2fapi%2fwinrt%2fmicrosoft.ui.xaml.controls.navigationview.isbackbuttonvisible)>