如何在xamarin表单中上下滑动时逐条显示列表中的每条记录

// 数据模型类
public class Record
{
    public string Title { get; set; }
    public string Content { get; set; }
}

// 页面的ViewModel
public class MainPageViewModel : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    public ObservableCollection<Record> Records { get; set; }

    public MainPageViewModel()
    {
        Records = new ObservableCollection<Record>();

        // 添加示例数据
        Records.Add(new Record { Title = "Record 1", Content = "Content 1" });
        Records.Add(new Record { Title = "Record 2", Content = "Content 2" });
        Records.Add(new Record { Title = "Record 3", Content = "Content 3" });
    }
}

// 页面的XAML
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:YourNamespace"
             x:Class="YourNamespace.MainPage">
    <ContentPage.BindingContext>
        <local:MainPageViewModel />
    </ContentPage.BindingContext>
    
    <ListView ItemsSource="{Binding Records}">
        <ListView.ItemTemplate>
            <DataTemplate>
                <ViewCell>
                    <StackLayout>
                        <Label Text="{Binding Title}" />
                        <Label Text="{Binding Content}" />
                    </StackLayout>
                </ViewCell>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>
</ContentPage>

// 页面的代码
public partial class MainPage : ContentPage
{
    private double startY;
    private double endY;
    private int currentIndex = 0;

    public MainPage()
    {
        InitializeComponent();

        // 监听滑动事件
        var panGesture = new PanGestureRecognizer();
        panGesture.PanUpdated += OnPanUpdated;
        ContentPage.GestureRecognizers.Add(panGesture);
    }

    private void OnPanUpdated(object sender, PanUpdatedEventArgs e)
    {
        switch (e.StatusType)
        {
            case GestureStatus.Started:
                startY = e.TotalY;
                break;
            case GestureStatus.Completed:
                endY = e.TotalY;
                var distance = startY - endY;

                // 根据滑动距离和方向计算当前应该显示的记录索引
                if (distance > 0 && currentIndex < Records.Count - 1)
                {
                    currentIndex++;
                }
                else if (distance < 0 && currentIndex > 0)
                {
                    currentIndex--;
                }

                // 更新ListView的SelectedItem属性
                RecordsListView.SelectedItem = Records[currentIndex];
                break;
        }
    }
}