How can i Change tab item Content on Xamarin forms shell

Question

I need to change one of my tabs' content depending on the condition of the user logged in or just a guest this is my 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"
       xmlns:pages="clr-namespace:E_commerce_App.Views.Pages"
       xmlns:views="clr-namespace:E_commerce_App.Views" x:DataType="views:TabContainer"
       x:Class="E_commerce_App.Views.TabContainer"
       TabBarBackgroundColor="#F7F7F7" BackgroundColor="red"
       TabBarTitleColor="red" TabBarUnselectedColor="Black"
       >

<TabBar>
    <Tab Title="Categories" Icon="menu.png">
        <ShellContent>
            <pages:Categories />
        </ShellContent>
    </Tab>
    <Tab Title="Cart" Icon="cart.png">
        <ShellContent >
            <pages:Cart />
        </ShellContent>
    </Tab>
    <Tab Title="Profile" Icon="user.png">
        <ShellContent
            ContentTemplate="{DataTemplate pages:Profile}" />
    </Tab>
    <Tab Title="Profile" Icon="user.png" x:Name="AccountDetailsPage" IsVisible="False" IsEnabled="True">
        <ShellContent Route="AccountDetails"
          ContentTemplate="{DataTemplate views:AccountDetails}">
        </ShellContent>
    </Tab>


</TabBar>

and I want to change the profile tab to account details if I logged in I tried to change app.current but it draw to screens overthem

Answer 1

There are many methods to achieve this.

1.You can save your user information first and access the information once page AccountDetails appears.

For example, you can use Xamarin.Essentials: Secure Storage to store user information.

To save a value for a given key in secure storage:

using Xamarin.Essentials; 

try
{
  await SecureStorage.SetAsync("usename", "user1");
}
catch (Exception ex)
{
  // Possible that device doesn't support secure storage on device.
}

To retrieve a value from secure storage once AccountDetails appears:

       protected override void OnAppearing()
    {
        base.OnAppearing();

        try
        {
            var username =  SecureStorage.GetAsync("usename");

            // display your code here
        }
        catch (Exception ex)
        {
            // Possible that device doesn't support secure storage on device.
        }
    }

2.Create a global varible in your app, them you can access this varible in your app.

For example:

create class MyVariables.csand add static variable for your model (e.g. MyViewModel ) :

public  class MyVariables
{
    public static MyViewModel myViewModel { get; set; } = new MyViewModel { Name = "test1" };
}

MyViewModel.cs

public class MyViewModel
{
    public string Name { get; set; }
}

You can modify or access your variable in your app:

 // modify the variable
 MyVariables.myViewModel.Name = "User01";

// access the variable
Debug.WriteLine("the user's name is: " + MyVariables.myViewModel.Name);