如何将手势识别器添加到viewModel C# [英] How can I add a gesture recognizer to a viewModel C#

问题描述

我有一个这样的标签:

<Label Grid.Row="1" Grid.Column="0" x:Name="faveLabel" Style="{StaticResource smallIcon}" FontFamily="FontAwesome" VerticalOptions="FillAndExpand" VerticalTextAlignment="Center" />

在后面的C#中，我有:

and in the C# behind I have:

faveLabel.GestureRecognizers.Add(
            new TapGestureRecognizer()
            {
                Command = new Command(() =>
                {
                    App.phrase.Favorite = !App.phrase.Favorite;
                    faveLabel.TextColor = App.phrase.Favorite == true ? Color.Red : Color.Gray;
                    App.DB.UpdateFavorite(App.phrase.Favorite, App.phrase.PhraseId);
                })
            });

当我将ViewModel绑定到此框架时，如何将其移入此viewModel代码中?

As I am binding a ViewModel to this frame then how can I move this into this viewModel code?

public class PhrasesFrameViewModel : ObservableProperty
{
    public PhrasesFrameViewModel()
    {

        var aButtonClickedCommand = new Command(() =>
        {
            App.DB.IncrementScore(App.cfs, App.phrase, (int)App.aBtn);
            App.correctButtonPressed = (int)App.aBtn;
            ResetTimer2();
        });

请注意，我真的想避免将手势识别器添加到XAML中，因为XAML已经很大.

Note that I would really like to avoid adding the gesture recognizer into the XAML as the XAML is already rather large.

推荐答案

您可以绑定到最新版本的Xamarin.Forms中的命令，因此可以执行以下操作:

You can bind to a command in the latest versions of Xamarin.Forms, so you can do something like so:

您的视图模型:

public class PhrasesFrameViewModel : ObservableProperty
{
    public PhrasesFrameViewModel()
    {

        var aButtonClickedCommand = new Command(() =>
        {
            App.DB.IncrementScore(App.cfs, App.phrase, (int)App.aBtn);
            App.correctButtonPressed = (int)App.aBtn;
            ResetTimer2();
        });

您的xaml:

<Label.GestureRecognizers>
    <TapGestureRecognizer Command="{Binding aButtonClickedCommand}"/>
</Label.GestureRecognizers>

这应该将视图模型中的命令绑定到标签.

That should bind the command in your viewmodel to your label.

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