Xamarin如何实现iOS <TableSection>，以及如何找到标题和颜色的确切大小？

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:YourNamespace"
             x:Class="YourNamespace.YourPage">
    <ContentPage.Content>
        <TableView>
            <TableRoot>
                <TableSection Title="Section 1" >
                    <TextCell Text="Cell 1" />
                    <TextCell Text="Cell 2" />
                </TableSection>
                <TableSection Title="Section 2">
                    <TextCell Text="Cell 3" />
                    <TextCell Text="Cell 4" />
                </TableSection>
            </TableRoot>
        </TableView>
    </ContentPage.Content>
</ContentPage>

using CoreGraphics;
using UIKit;

// 获取标题的确切大小
string title = "Section 1";
UIFont font = UIFont.SystemFontOfSize(17); // 设置标题的字体大小
CGSize size = new NSString(title).GetSizeUsingAttributes(new UIStringAttributes { Font = font });
double width = size.Width;
double height = size.Height;