How to add a Behaviour to a Control in my Xaml but only for a specific platform?-CodePudding

I have created a behaviour for my Xamarin application but I only want this behaviour to be used when running on UWP. How can I do this in XAML?

I know about using OnPlatform, But I am not sure how to use something like that for Behaviours and Effects. (Or generally anything that is a list in XAML).

Any help on this would be much appreciated.

CodePudding user response：

You just could check in your OnAttachedOn method of your behaviour which device it is like so:

if(Device.RuntimePlatform == Device.UWP)
{
    //then do something
}

This is a good example how behaviours work: https://github.com/codemillmatt/xamarin-show-demos/blob/master/Behaviors/Behaviors/Behaviors/EntryPressCommandBehavior.cs

CodePudding user response：

I think this is what you can use.Made 3 different Entry's A,B and C . You can use them platform-specific In App.xaml

  <Style x:Key="AEntry" TargetType="Entry">
        <Setter Property="TextColor" Value="#A7ADB1" />
        <Setter Property="BackgroundColor" Value="#25333E" />
        <Setter Property="WidthRequest" Value="80" />
        <Setter Property="HeightRequest" Value="10" />
        <Setter Property="IsReadOnly" Value="True" />
        <Setter Property="Opacity" Value="0.8" />
        <Setter Property="HorizontalTextAlignment" Value="Center" />
    </Style>
    <Style x:Key="CEntry" TargetType="Entry">
        <Setter Property="TextColor" Value="#A7ADB1" />
        <Setter Property="BackgroundColor" Value="#25333E" />
        <Setter Property="WidthRequest" Value="80" />
        <Setter Property="HeightRequest" Value="10" />
        <Setter Property="IsReadOnly" Value="False" />
        <Setter Property="Opacity" Value="0.8" />
        <Setter Property="Keyboard" Value="Numeric" />
        <Setter Property="HorizontalTextAlignment" Value="Center" />
    </Style>
    <Style x:Key="BEntry" TargetType="Entry">
        <Setter Property="TextColor" Value="#A7ADB1" />
        <Setter Property="BackgroundColor" Value="#25333E" />
        <Setter Property="FontSize" Value="Medium" />
        <Setter Property="IsReadOnly" Value="True" />
        <Setter Property="HorizontalTextAlignment" Value="Center" />
    </Style>

Use in MainPage.xaml

  <Entry
                        x:Name="Totaaltanks"
                        Grid.Row="12"
                        Grid.Column="4"
                        Grid.ColumnSpan="2"
                        Style="{x:OnPlatform Android={StaticResource BEntry},
                                             UWP={StaticResource CEntry},
                                             iOS={StaticResource AEntry}}" />

Alternatively, you can set platform-specific style attributes in the same style.

<Style x:Key="AEntry" TargetType="Entry">
<Setter Property="FontSize" Value="{x:OnPlatform UWP='', iOS='22', Android='20'}" />
...