这是我最终解决问题的方法.我的 TabbedPage 由每个选项卡的 NavigationPage 组成，因此如果您不使用导航页面，则您的代码将不得不稍作更改，但只是稍微更改.你可以把你的刷新"逻辑放在 OnTabbarControllerItemSelected(iOS)和 OnTabbarControllerItemSelected(Android)中.查看下面的代码.

Here is how I ended up solving the issue. My TabbedPage consisted of a NavigationPage for each tab, so if you are not using navigation pages your code will have to change a little bit but only slightly. You can put your "refresh" logic inside of OnTabbarControllerItemSelected for iOS and OnTabbarControllerItemSelected for Android. Check out the code below.

Android 渲染器(由 Mike Ma 提供)

Android Renderer (courtesy of Mike Ma)

using Android.Support.Design.Widget;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;
using Xamarin.Forms.Platform.Android.AppCompat;
[assembly: ExportRenderer(typeof(MainTabbedPage), typeof(MainPageRenderer))]
namespace YourNameSpace
{
    public class MainPageRenderer : TabbedPageRenderer, TabLayout.IOnTabSelectedListener
    {
        private MainTabbedPage _page;
        protected override void OnElementChanged(ElementChangedEventArgs<TabbedPage> e)
        {
            base.OnElementChanged(e);
            if (e.NewElement != null)
            {
                _page = (MainTabbedPage)e.NewElement;
            }
            else
            {
                _page = (MainTabbedPage)e.OldElement;
            }

        }
        async void TabLayout.IOnTabSelectedListener.OnTabReselected(TabLayout.Tab tab)
        {
            await _page.CurrentPage.Navigation.PopToRootAsync();
        }
    }
}

iOS 渲染器:

using UIKit;
using System;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;

[assembly: ExportRenderer(typeof(MainTabbedPage), typeof(MainPageRenderer))]
namespace YourNameSpace
{
    public class MainPageRenderer : TabbedRenderer
    {
        private MainTabbedPage _page;
        protected override void OnElementChanged(VisualElementChangedEventArgs e)
        {
            base.OnElementChanged(e);

            if (e.NewElement != null)
            {
                _page = (MainTabbedPage)e.NewElement;
            }
            else
            {
                _page = (MainTabbedPage)e.OldElement;
            }

            try
            {
                var tabbarController = (UITabBarController)this.ViewController;
                if (null != tabbarController)
                {
                    tabbarController.ViewControllerSelected += OnTabbarControllerItemSelected;
                }
            }
            catch (Exception exception)
            {
                Console.WriteLine(exception);
            }
        }

        private async void OnTabbarControllerItemSelected(object sender, UITabBarSelectionEventArgs eventArgs)
        {
            if (_page?.CurrentPage?.Navigation != null && _page.CurrentPage.Navigation.NavigationStack.Count > 0)
            {
                await _page.CurrentPage.Navigation.PopToRootAsync();
            }

        }
    }
}