Xamarin在Xaml中形成OnPlatform [英] Xamarin Forms OnPlatform in Xaml

问题描述

我有以下C#代码:

var footer = new StackLayout()
            { BackgroundColor = Device.OnPlatform(Color.FromRgb(225, 240, 251), Color.FromRgb(225, 240, 251), Color.Black),
            };

如何将其转换为Xamarin Xaml，更重要的是，将其转换为FromRgb的设备平台规范?

How can I translate that into Xamarin Xaml, more importantly the Device Platform specifics for the FromRgb?

到目前为止，我有以下XAML ...再次，是FromRgb困扰了我.

I have the following XAML so far... again, it's the FromRgb that's stumping me.

<StackLayout.BackgroundColor>
    <Color>
        <OnPlatform x:TypeArguments="Color"></OnPlatform>
    </Color>
</StackLayout.BackgroundColor>

更新14/02/2015

UPDATE 14/02/2015

我刚刚尝试了以下答案，但有以下内容，但它没有更新iOS或Windows Phone的背景色.如果我将背景色添加到根StackLayout元素中，则可以使用...:

I've just tried the answer below and I have the following but it's not updating the background colour for either iOS or Windows Phone. If I add the Background Color to the root StackLayout element it works...:

<StackLayout HorizontalOptions="FillAndExpand">
    <StackLayout.BackgroundColor>
      <Color>
        <OnPlatform x:TypeArguments="Color">
          <OnPlatform.WinPhone>#51C0D4</OnPlatform.WinPhone>
          <OnPlatform.iOS>#51C0D4</OnPlatform.iOS>
        </OnPlatform>
      </Color>
    </StackLayout.BackgroundColor>
    <Label Text=""></Label>
    <StackLayout Orientation="Horizontal"  VerticalOptions="EndAndExpand" HorizontalOptions="FillAndExpand">
      <StackLayout Orientation="Horizontal" HorizontalOptions="CenterAndExpand">
      <Button Text="Login"></Button>
      <Button Text="Sign Up"></Button>
      </StackLayout>
    </StackLayout>
  </StackLayout>

推荐答案

您快到了.默认转换器负责将颜色从命名颜色(例如，白色，红色等)或十六进制颜色(例如:#FF0000)进行转换.

You're almost there. The default converter takes care of converting the color from either a named color (e.g. White, Red, etc.) or a hex color (e.g.: #FF0000).

<StackLayout.BackgroundColor>
    <OnPlatform x:TypeArguments="Color">
        <OnPlatform.iOS>#FF0000</OnPlatform.iOS>
        <OnPlatform.Android>#00FF00</OnPlatform.Android>
    </OnPlatform>
</StackLayout.BackgroundColor>

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