Changing the property of a tab item from AppShell in another page?

Question

Working on Xamarin.Forms app with a Tab at the bottom, defined in the AppShell.xaml file

I want to be able from other pages (page1.xaml, page2.xaml) to be able to enable/disable certain tab items.

For each of the tabs in AppShell I have x:Name="myTabPage1", x:Name="myTabPage2", and so on

I want to be able to do myTabPage1.IsEnabled=false from inside another page, eg page2.xaml.cs

But I can't work out how to reference something in the AppShell.

Any ideas?

Answer 1

Hello,

Welcome to our Microsoft Q&A platform!

If you want to change one ShellSection's IsEnable status, I suggest you can use MessageCenter to do this.

My ShellItems:

 <ShellItem>  
    <ShellSection  
        x:Name="itempage"  
        Title="Browse"  
        Icon="tab_feed.png">  
        <ShellContent>  
            <local:ItemsPage />  
        </ShellContent>  
    </ShellSection>  
    <ShellSection  
        x:Name="aboutpage"  
        Title="About"  
        Icon="tab_about.png"  
        IsEnabled="False">  
        <ShellContent>  
            <local:AboutPage />  
        </ShellContent>  
    </ShellSection>  
</ShellItem>  

And subscribe to a message in AppShell.cs:

 public AppShell()  
    {  
        InitializeComponent();  
  
        MessagingCenter.Subscribe<AppShell>(this, "Hi", (sender) =>  
        {  
            aboutpage.IsEnabled = true;  
        });  
    }  

Sending one message in HandlingPage Contentpage:

private void btn1_Clicked(object sender, EventArgs e)  
    {  
        MessagingCenter.Send<AppShell>(new AppShell(),"Hi");  
    }  

For more about MessageCenter, you can check : https://learn.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/messaging-center
Best Regards,

Jessie Zhang

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