Question

我有以下页面：

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:Taps"
             x:Class="Taps.MainPage">
    <ContentPage.Resources>
        <ResourceDictionary>
            <local:AboutViewModel x:Key="AboutViewModel" />
        </ResourceDictionary>
    </ContentPage.Resources>

    <StackLayout BindingContext="{StaticResource AboutViewModel}">
        <StackLayout.GestureRecognizers>
            <TapGestureRecognizer Command="{Binding ShowHiddenTextCommand}" NumberOfTapsRequired="5" />
        </StackLayout.GestureRecognizers>

        <StackLayout Orientation="Horizontal" VerticalOptions="Center" HorizontalOptions="Center">
            <Image HeightRequest="77" WidthRequest="115" />
            <Label Text="MyApp" FontSize="48" HorizontalTextAlignment="Center" VerticalTextAlignment="Center" />
        </StackLayout>

        <Label Text="My name" />
        <Label Text="1.0.00" />
        <Label Text="Platform" />
        <Label TextColor="Blue" Text="Open Stackoverflow">
            <Label.GestureRecognizers>
                <TapGestureRecognizer Command="{Binding OpenStackOverflowCommand}" />
            </Label.GestureRecognizers>
        </Label>

        <Editor IsEnabled="False" Text="{Binding HiddenText}" IsVisible="{Binding ShowHiddenText}" />
    </StackLayout>
</ContentPage>

查看模型：

using System;
using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.Command;
using Xamarin.Forms;

namespace Taps {
  public sealed class AboutViewModel : ViewModelBase {
    public string HiddenText { get; } = "Some text";

    private bool showHiddenText;
    public bool ShowHiddenText {
      get => showHiddenText;
      private set => Set(() => ShowHiddenText, ref showHiddenText, value);
    }

    private RelayCommand showhiddenTextCommand;
    public RelayCommand ShowHiddenTextCommand => showhiddenTextCommand ?? (showhiddenTextCommand = new RelayCommand(() => ShowHiddenText = true));

    private RelayCommand openStackOverflowCommand;
    public RelayCommand OpenStackOverflowCommand => openStackOverflowCommand ?? (openStackOverflowCommand = new RelayCommand(() => Device.OpenUri(new Uri("http://stackoverflow.com"))));
  }
}

当点击堆栈面板所需的次数时，这似乎没有显示隐藏的编辑器。它似乎适用于运行Android 5.1的Moto G，但不适用于iPod Touch而不适用于UWP。

标签点击似乎在所有平台上都能正常工作，所以我不确定发生了什么。如何在指定的点击次数后触发ShowHiddenTextCommand？

我正在使用最新的Xamarin.Forms和MvvmLight库。

水龙头手势不起作用？

0 个答案: