我正在尝试制作一个使用
NavigationView
的UWP应用程序。我的问题是如何找到一种方法来使当前显示页面的Header
发生变化。我的应用程序基于微软UWP示例"AppUIBasics"。在示例中,NavigationView
的Header
始终显示为“欢迎”,因为它被硬编码了,但我希望它根据所选页面而改变。
MainPage.xaml: <NavigationView x:Name="NavView"
ItemInvoked="NavView_ItemInvoked"
SelectionChanged="NavView_SelectionChanged"
Loaded="NavView_Loaded"
Canvas.ZIndex="0">
<NavigationView.HeaderTemplate>
<DataTemplate>
<Grid Margin="24,10,0,0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<TextBlock x:Name="appTitle" Style="{StaticResource TitleTextBlockStyle}"
FontSize="28"
VerticalAlignment="Center"
Text="Welcome"/>
<CommandBar Grid.Column="1"
HorizontalAlignment="Right"
VerticalAlignment="Top"
DefaultLabelPosition="Right"
Background="{ThemeResource SystemControlBackgroundAltHighBrush}">
<AppBarButton Label="Refresh" Icon="Refresh"/>
<AppBarButton Label="Import" Icon="Import"/>
</CommandBar>
</Grid>
</DataTemplate>
</NavigationView.HeaderTemplate>
<NavigationView.MenuItems>
<NavigationViewItem x:Uid="HomeNavItem" Content="" Tag="home">
<NavigationViewItem.Icon>
<FontIcon Glyph=""/>
</NavigationViewItem.Icon>
</NavigationViewItem>
<NavigationViewItemSeparator/>
<NavigationViewItem x:Uid="ConnectionNavItem" Icon="world" Content="" Tag="connection"/>
<NavigationViewItem x:Uid="CameraNavItem" Icon="video" Content="" Tag="camera"/>
</NavigationView.MenuItems>
<Frame x:Name="rootFrame" Margin="24">
<Frame.ContentTransitions>
<TransitionCollection>
<NavigationThemeTransition/>
</TransitionCollection>
</Frame.ContentTransitions>
</Frame>
</NavigationView>
MainPage.xaml.cs:
public sealed partial class MainPage : Page {
public static MainPage Current;
public static Frame RootFrame = null;
//private RootFrameNavigationHelper _navHelper;
private ResourceLoader _resourceLoader = Windows.ApplicationModel.Resources.ResourceLoader.GetForCurrentView();
public MainPage() {
this.InitializeComponent();
this.Loaded += (sender, args) => {
Current = this;
var titleBar = Windows.ApplicationModel.Core.CoreApplication.GetCurrentView().TitleBar;
};
}
public Frame AppFrame { get { return this.rootFrame; } }
private void NavView_Loaded(object sender, RoutedEventArgs e) {
// set the initial SelectedItem
foreach (NavigationViewItemBase item in NavView.MenuItems) {
if (item is NavigationViewItem && item.Tag.ToString() == "home") {
NavView.SelectedItem = item;
break;
}
}
}
private void NavView_ItemInvoked(NavigationView sender, NavigationViewItemInvokedEventArgs args) {
if (args.IsSettingsInvoked) {
rootFrame.Navigate(typeof(SettingsPage));
} else {
// find NavigationViewItem with Content that equals InvokedItem
var item = sender.MenuItems.OfType<NavigationViewItem>().First(x => (string)x.Content == (string)args.InvokedItem);
NavView_Navigate(item as NavigationViewItem);
}
}
private void NavView_SelectionChanged(NavigationView sender, NavigationViewSelectionChangedEventArgs args) {
if (args.IsSettingsSelected) {
rootFrame.Navigate(typeof(SettingsPage));
} else {
NavigationViewItem item = args.SelectedItem as NavigationViewItem;
NavView_Navigate(item);
}
}
private void NavView_Navigate(NavigationViewItem item) {
switch (item.Tag) {
case "home":
rootFrame.Navigate(typeof(HomePage)); break;
case "connection":
rootFrame.Navigate(typeof(ConnectionPage)); break;
case "camera":
rootFrame.Navigate(typeof(CameraPage)); break;
}
}
}