Xamarin如何加边框

方法1：两个层，内层与外层用背景颜色差，padding设置边框

<StackLayout BackgroundColor="White">
<StackLayout BackgroundColor="Black" Padding="1">
<Editor BackgroundColor="White" />
</StackLayout>
...
</StackLayout>

方法2：Frame 可以套在外面设置边框也可以设置圆边

<Frame Grid.Row="1" MinimumHeightRequest="200" BorderColor="Black" CornerRadius="20" HasShadow="True" BackgroundColor="#cfe2f3">
<StackLayout BackgroundColor="Transparent" VerticalOptions="FillAndExpand">
<radialView:RadialProgressView VerticalOptions="FillAndExpand" BindingContext="{Binding radialProgressViewModel}" />
<Label FontSize="Large" Text="实时数据" TextColor="#3399CC" VerticalOptions="End" HorizontalTextAlignment="Center"></Label>
</StackLayout>
</Frame>