在Xamarin Forms Shell上设置默认选项卡 [英] Set default tab on Xamarin Forms Shell

问题描述

如何在Xamarin表单外壳的标签栏中设置默认的选定标签?

How to set the default selected Tab inside the tab bar on Xamarin forms shell?

<?xml version="1.0" encoding="UTF-8"?>
<Shell xmlns="http://xamarin.com/schemas/2014/forms" 
         xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" 
         x:Class="TestApp.NavigationShell"
         xmlns:pages="clr-namespace:TestApp.Pages"
         xmlns:pageModels="clr-namespace:TestApp.PageModels">
<TabBar Route="testapp">
    <Tab Title="Saved" Icon="tabDashboard" Route="dashboard"><ShellContent ContentTemplate="{DataTemplate pages:DashBoardPage}"/></Tab>
    <Tab Title="Calendar" Icon="tabCalendar" Route="calendar"><ShellContent ContentTemplate="{DataTemplate pages:CalendarPage}"/></Tab>
    <Tab Title="Search" Icon="tabSearch" Route="search"><ShellContent ContentTemplate="{DataTemplate pages:SearchPage}"/></Tab>
    <Tab Title="Support" Icon="tabSupport" Route="support"><ShellContent ContentTemplate="{DataTemplate pages:SupportPage}"/></Tab>
    <Tab Title="Profile" Icon="tabAccount" Route="account"><ShellContent ContentTemplate="{DataTemplate pages:AccountPage}"/></Tab>
</TabBar>

根据Xamarin Forms文档，第一个Shell内容将是屏幕上的默认内容.然而;我正在尝试将搜索"页面设置为默认选项卡，而不是已保存"页面.

According to the Xamarin Forms documentation, the first Shell Content will be the default content on the screen. However; I'm trying to set the "Search" page as the default tab rather than "Saved".

我试图设置Tab索引-不走运 我还尝试在Shell的onAppearing方法上调用路由，但似乎Shell的onappearing方法永远不会被触发.

I tried to set Tab Index - no luck I also tried to call routing on onAppearing method of Shell but seems like Shell's on appearing method never gets fired.

我也尝试导航到搜索

public partial class NavigationShell : Shell
{
    public NavigationShell()
    {
        InitializeComponent();
        //Shell.Current.TabIndex = 2;
    }

    protected override async void OnAppearing()
    {
        base.OnAppearing();
        //await Shell.Current.GoToAsync("testapp/search");
    }
}

打开应用时需要设置默认选项卡的最佳解决方案是什么?

What could be the best solution that when app opens need to set the default tab?

谢谢.

推荐答案

没关系，我想我找到了解决方案.

Nevermind, I think I found a solution.

public Page Init(Shell root)
{
    CurrentShell = root;
    root.CurrentItem.CurrentItem = root.CurrentItem.Items[2];
    return CurrentShell;
}

如果我的外壳只有一个根项目，即标签栏本身.我只是得到了搜索选项卡，并分配给了第一个孩子的当前项目，所以它起作用了.

Becase my shell have ONLY one root item which is tabbar itself. I just get the search tab and assigned to the first child's current item and it worked.

如果您发现其他方法，请发表您的答案. 谢谢.

Please post your answers if you found another way around. Thank you.

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