单击同一选项卡 text/icon 两次时如何使选项卡式页面导航？

Question

所以我有一个标签页，并且有几个标签与之关联

在第一个选项卡上我有一个列表，如果我在其中单击一个图块，比如说图块 1，然后我会打开另一个页面，保持选项卡完好无损，但我想要的是当我再次单击选项卡选项 1 时，那么它应该进入主列表，这不会发生任何见解都会非常有帮助点击 "tile1"，我做

await Navigation.PushAsync(new SubCategoryView());

我认为这是正确的方法，具有讽刺意味的是，预期行为在 iOS 中有效，但在 Android

中无效

Answer 1

如果你想return到根页面时select相同的标签页，你可以使用Custom Renderer

在Android


using Android.Content;

using Android.Support.Design.Widget;
using xxx;
using xxx.Droid;

using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;
using Xamarin.Forms.Platform.Android.AppCompat;

[assembly: ExportRenderer(typeof(TabbedPage), typeof(MyTabbedRenderer))]
namespace xxx.Droid
{
    public class MyTabbedRenderer : TabbedPageRenderer, TabLayout.IOnTabSelectedListener
    {

        public MyTabbedRenderer(Context context) : base(context)
        {

        }

        private TabbedPage tabbed;
        protected override void OnElementChanged(ElementChangedEventArgs<TabbedPage> e)
        {
            base.OnElementChanged(e);

            if (e.NewElement != null)
            {
                tabbed = (TabbedPage)e.NewElement;
            }
            else
            {
                tabbed = (TabbedPage)e.OldElement;
            }

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

    }

   
}

在iOS

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

[assembly: ExportRenderer(typeof(TabbedPage), typeof(MyTabbedRenderer))]
namespace xxx.iOS
{
    public class MyTabbedRenderer : TabbedRenderer
    {
        private TabbedPage tabbed;
        protected override void OnElementChanged(VisualElementChangedEventArgs e)
        {
            base.OnElementChanged(e);

            if (e.NewElement != null)
            {
                tabbed = (TabbedPage)e.NewElement;
            }
            else
            {
                tabbed = (TabbedPage)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 (tabbed?.CurrentPage?.Navigation != null && tabbed.CurrentPage.Navigation.NavigationStack.Count > 0)
            {
                await tabbed.CurrentPage.Navigation.PopToRootAsync();
            }

        }
    }
}

单击同一选项卡 text/icon 两次时如何使选项卡式页面导航？

how to make the tabbed page navigate when clicked on the same tab text/icon twice?

android

xamarin.android

xamarin

xamarin.forms

tabbedpage

在Android

在iOS