方法1：兩個層，內層與外層用背景顏色差，padding設置邊框
<StackLayout BackgroundColor="White"> <StackLayout BackgroundColor="Black" Padding="1"> <Editor BackgroundColor="White" /> </StackLayout> ... </StackLayout>
方法2：Frame 可以套在外面設置邊框也可以設置圓邊
1 <Frame Grid.Row="1" MinimumHeightRequest="200" BorderColor="Black" CornerRadius="20" HasShadow="True" BackgroundColor="#cfe2f3"> 2 <StackLayout BackgroundColor="Transparent" VerticalOptions="FillAndExpand"> 3 <radialView:RadialProgressView VerticalOptions="FillAndExpand" BindingContext="{Binding radialProgressViewModel}" /> 4 <Label FontSize="Large" Text="實時數據" TextColor="#3399CC" VerticalOptions="End" HorizontalTextAlignment="Center"></Label> 5 </StackLayout> 6 </Frame>