Question

嘿大家好日子我在xaml中创建了tabbed，我更喜欢xaml，因为我登录了xaml代码。我的代码

Tab.xaml

<TabbedPage 
        xmlns="http://xamarin.com/schemas/2014/forms"
        xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
        xmlns:local="clr-namespace:FormsSample.Views;assembly=FormsSample"
        x:Class="FormsSample.Views.LoginPage"
        x:Name="TbPage">
     <TabbedPage.Children>
        <ContentPage x:Name="TbLog" Title="Login">
        </ContentPage>
        <ContentPage x:Name="TbSch" Title="Schedule">
        </ContentPage>
        <ContentPage x:Name="TbLis" Title="Customers">
        </ContentPage>
        </TabbedPage.Children>   
</TabbedPage>

Tab.xaml.cs

   namespace FormsSample.Views
   {
    public partial class LoginPage : TabbedPage 
    {

       private readonly TabbedPage _tbPage;
       private readonly ContentPage _tbList;
       private readonly ContentPage _tbLogn; 


       public LoginPage()
       {
        InitializeComponent ();
        _tbPage = this.FindByName<TabbedPage>("TbPage");
        _tbList = this.FindByName<ContentPage>("TbLis");
        _tbLogn = this.FindByName<ContentPage>("TbLog");
        RunTime();
        }

        private void RunTime()
        {
               _tbPage.CurrentPage = _tbLogn; 
           if (_tbPage.SelectedItem == _tbPage.Children[2])
           {
              DisplayAlert("Tab", "Hello World", "OK");
           }
         }

       }

     }

更改为

  _tbPage.SelectedItem == _tbList

它的类似没有任何反应，如何解决这个问题？非常感谢。

Answer 1

这可能不太花哨但对我有用：D

        this.CurrentPageChanged += (o, e) => 
        {
           var i = this.Children.indexOf(this.CurrentPage); 
            if(i == 1 && UsrType == 2)
            {
                 DisplayAlert("Admin", "Administrator Privilege required!", "OK");
                 this.CurrentPage = _tbLog;
            }
        };

Answer 2

在将SelectedItem设置为要显示的页面之前，我先将null设置为public function dtrdata(){ $totalnumdays = 31; //31 $firstdaynum = 4; //6 max // convert day to num $reset = 0; $weekdays = array('Mon','Tue','Wed','Thu','Fri','Sat','Sun'); for($i=1;$i<=$totalnumdays;$i++){ for($x=0; $x<count($weekdays); $x++){ $index = $firstdaynum+$reset; //fri start; index in array if($index == 6){ $reset = $firstdaynum * -1; }else{ $reset++; } break; } } return view('pages/admin', compact('i')); } //Views <tr> <td>{{ i}}</td> </tr>。

TabbedPage.xaml中的SelectedItem不起作用Xamarin.Form

2 个答案: