[英]how to make the tabbed page navigate when clicked on the same tab text/icon twice?
如果想在 select 同分页时返回根页面,可以使用Custom Renderer
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();
}
}
}
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();
}
}
}
}
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