如何使用C＃代码和XAML在xamarin.forms中使用成语

Question

How to use idiom to set Grid (height, width) padding, margin and to set label font size in xamarin forms using C# and XAML code.

I have an example of use Rectangle with StackLayout. But i am not aware of using it with other controls.

<StackLayout Spacing="10" AbsoluteLayout.LayoutFlags="All" BackgroundColor="#0E517B" Padding="0,30,0,0">
<StackLayout.AbsoluteLayout.LayoutBounds>
    <OnIdiom x:TypeArguments="Rectangle" Phone="0.5,1,1,0.80" Tablet="1,0,0.5,1" />
</StackLayout.AbsoluteLayout.LayoutBounds></StackLayout>

Answer 1

You can use it with virtually any property of any type of object you use in XAML.

Just use the right property and get the correct type of the argument it needs.

For instance, if you want to set the Spacing in a Grid , just do this:

<Grid VerticalOptions="FillAndExpand">
  <Grid.ColumnSpacing>
    <OnIdiom x:TypeArguments="x:Double"
             Phone="20"
             Tablet="40"/>
 </Grid.ColumnSpacing>
  <Grid.RowSpacing>
    <OnIdiom x:TypeArguments="x:Double"
             Phone="10"
             Tablet="20"/>
  </Grid.RowSpacing>
  <Grid.Padding>
    <OnIdiom x:TypeArguments="Thickness"
             Phone="10, 10, 10, 0"
             Tablet="20, 20, 20, 0"/>
  </Grid.Padding>
  <!-- Grid Content -->
</Grid>

The things to note here is that we set the ColumnSpacing by adding a child node to the Grid and as a child of that we use the OnIdiom . If you would want to do something different for a platform there is also the OnPlatform .

The only thing you need to figure out is what the x:TypeArguments has to be. This is the type of object that you are trying to assign as a value. In the case above, you would have to check what the type of Grid.ColumnSpacing is, which is a Double .

For more on this check this blog post by James Montemagno.