绑定命令根本不响应

Question

我已经使用了TapGestureRecognizer并将它们绑定到某个命令，该命令工作正常......

这是一个例子：

IrrigNetPage.xaml（查看）

<StackLayout.GestureRecognizers>
    <TapGestureRecognizer Command="{Binding TabTappedCommand}" CommandParameter="map"/>
</StackLayout.GestureRecognizers>

<Grid IsVisible="{Binding IsGridHeaderVisible}">
    <Grid.GestureRecognizers>
        <TapGestureRecognizer Command="{Binding HideListOnTapCommand}"/>
    </Grid.GestureRecognizers>
</Grid>

IrrigNetPage.xaml.cs

public partial class IrrigNetPage : ContentPage
{
    public IrrigNetPage ()
    {
        InitializeComponent ();
        BindingContext = new IrrigNetViewModel();
    }
}

IrrigNetViewModel.cs

[AddINotifyPropertyChangedInterface]
public class IrrigNetViewModel : PopupPage
{
    public ICommand TabTappedCommand { get; }
    public ICommand HideListOnTapCommand { get; }
    public ICommand ShowIrrigNetDetailPageCommand { get; }

    public IrrigNetViewModel()
    {
        TabTappedCommand = new Command((tabName) => OnTapClicked(tabName.ToString()));
        HideListOnTapCommand = new Command(HideListOnTap);
        ShowIrrigNetDetailPageCommand = new Command(ShowDetailPage);

    private void ShowDetailPage()
    {
        Navigation.PushPopupAsync(new IrrigNetDetailsPage());
    }

    private void HideListOnTap()
    {
        IsListVisible = !IsListVisible;
    }

    private void OnTapClicked(string tabName)
    {

        if (tabName == "location")
        {
....

所以我对TabTappedCommand和HideListOnTapCommand采用与ShowIrrigNetDetailPageCommand相同的方式，但由于某种原因，当我点击TapGestureRecognizer时没有任何反应。我试图调试，但我没有得到任何异常或错误...只是没有发生...

我安装了Rg.Plugins.Popup，因为IrrigNetDetailsPage.xaml是qazxsw poi

IrrigNetDetailsPage.xaml.cs

<pages:PopupPage mlns:pages="clr-namespace:Rg.Plugins.Popup.Pages;assembly=Rg.Plugins.Popup">
...

IrrigNetPage.xaml绑定（不起作用）

public partial class IrrigNetDetailsPage : PopupPage
{
    public IrrigNetDetailsPage ()
    {
        InitializeComponent ();
        BindingContext = new IrrigNetDetailsViewModel();
    }
}

所以，我以与

<Frame.GestureRecognizers>
    <TapGestureRecognizer Command="{Binding ShowIrrigNetDetailPageCommand}"/>
</Frame.GestureRecognizers>

和TabTappedCommand相同的方式完成了所有事情，但很明显我错过了一些东西......

Answer 1

当您在方法中导航时，它需要是异步的。所以你的方法看起来像这样：

HideListOnTapCommand