PushAsync is not supported globally on iOS, please use a NavigationPage

Question

Everything is working fine when I am handling the Tap event of a ListView item, but when I use this in a TabbedPage it shows the exception please p

Answer 1

You probably have some code somewhere similar to this in your App.xaml.cs:

public App()
{
    InitializeComponent();

    var tabs = new TabbedPage();    
    tabs.Children.Add(new NavTestPage() { Title = "Tab title" });
    MainPage = tabs;
}

Which you should change to:

public App()
{
    InitializeComponent();

    var tabs = new TabbedPage();
    var page = new NavTestPage() { Title = "Page title" };    
    tabs.Children.Add(new NavigationPage(page) { Title = "Tab title" });

    MainPage = tabs;
}

By wrapping in a NavigationPage you get the option to push pages onto the navigation stack. A TabbedPage on itself is just tabs with only 1 page per tab. This should give you a structure like this:

TabbedPage
    NavigationPage
        ContentPage
    NavigationPage
        ContentPage
    NavigationPage
        ContentPage

Update: I guess what you're doing is simply changing ContentPage to TabbedPage in your XAML. That's not how TabbedPage works. You should probably read up on how TabbedPage actually works in the first place.

https://developer.xamarin.com/guides/xamarin-forms/application-fundamentals/navigation/tabbed-page/

In your case you should probably create a new page which has XAML like this:

Set this as the MainPage in App.xaml.cs:

public App()
{
    InitializeComponent();
    MainPage = new MyTabbedPage();
}