用于选项卡式页面的Xamarin Forms iOS自定义呈现器

public class CustomTabbedPage : TabbedPage
{
    public CustomTabbedPage()
    {
        Children.Add(new ContentPage { Title = "Tab 1" });
        Children.Add(new ContentPage { Title = "Tab 2" });
    }
}

using Xamarin.Forms.Platform.iOS;

[assembly: ExportRenderer(typeof(CustomTabbedPage), typeof(CustomTabbedPageRenderer))]

namespace YourNamespace.iOS
{
    public class CustomTabbedPageRenderer : TabbedRenderer
    {
        public CustomTabbedPageRenderer(TabbedPage view) : base(view)
        {
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();

            // 自定义选项卡样式
            var tabBarController = (UITabBarController)ViewController;
            foreach (var tabBarItem in tabBarController.TabBar.Items)
            {
                tabBarItem.ImageInsets = new UIEdgeInsets(0, -10, 0, 0);
            }
        }
    }
}