UWP MVVM NavigationView BackButton -按下时检测

using Prism.Commands;
using Prism.Mvvm;

namespace YourNamespace
{
    public class MainViewModel : BindableBase
    {
        public DelegateCommand BackButtonCommand { get; }

        public MainViewModel()
        {
            BackButtonCommand = new DelegateCommand(OnBackButtonPressed);
        }

        private void OnBackButtonPressed()
        {
            // 处理BackButton按下事件的逻辑
            // 可以在这里执行返回上一个导航页面的操作
        }
    }
}

<Page
    ...
    xmlns:local="using:YourNamespace"
    xmlns:prismCommands="using:Prism.Commands"
    xmlns:prismInteractivity="using:Prism.Interactivity"
    xmlns:prismMvvm="using:Prism.Mvvm">

    <Page.DataContext>
        <local:MainViewModel />
    </Page.DataContext>

    <Grid>
        <NavigationView>
            <NavigationView.BackRequested>
                <prismInteractivity:EventToCommandBehavior Command="{Binding BackButtonCommand}" />
            </NavigationView.BackRequested>
        </NavigationView>
    </Grid>
</Page>