xamarin.forms - 在特定平台上添加 TapGestureRecognizer

Question

TapGestureRecognizer是否可以仅在 UWP 上添加一个？像这样的东西

<OnPlatform x:TypeArguments="GestureRecognizers">
    <OnPlatform.Platforms>
        <On Platform="UWP">
            <TapGestureRecognizer Command="{Binding MyUWPCommand}"/>
        </On>
    </OnPlatform.Platforms>
</OnPlatform>

Answer 1

在 XAML 中：

<OnPlatform x:TypeArguments="Label">
    <On Platform="UWP">
        <Label Text="TapGestureRecognizer for UWP">
            <Label.GestureRecognizers>
                <TapGestureRecognizer Command="{Binding MyUWPCommand}" />
            </Label.GestureRecognizers>
        </Label>
    </On>
    <On Platform="Android, iOS">
        <Label Text="No GestureRecognizers for Android, iOS" />
    </On>
</OnPlatform>

Answer 2

为什么不在MyUWPCommand检查当前平台是否为 UWP 的代码中？如果是，则执行代码，如果不是，则不执行任何操作。

Answer 3

只需将每个 GestureRecognizer 包装在 OnPlatform 中

<ContentView.GestureRecognizers>
  <OnPlatform x:TypeArguments="GestureRecognizer">
    <OnPlatform.Platforms>
        <On Platform="UWP">
            <TapGestureRecognizer Command="{Binding MyUWPCommand}"/>
        </On>
    </OnPlatform.Platforms>
  </OnPlatform>
</ContentView.GestureRecognizers>