CODEWITHSUNDEEP
c#xamarin.forms
Arvind Chourasiya
Arvind Chourasiya

Reputation: 17422

Detecting tab changed event

I am working on xamarin.forms. I need to detect the event of tab being changed either by swapping left or right or by clicking without using custom renderer

I tried below event but it is firing in both cases when child page being pushed or tab being changed. how can i get isolated event of tab being changed

public class MyTabbedPage : TabbedPage
{
   public MyTabbedPage()
   {
      this.CurrentPageChanged += CurrentPageHasChanged;
   }
   protected void CurrentPageHasChanged(object sender,EventArgs e)
   {
       var pages= Navigation.NavigationStack;
       if (pages.Count > 0)
       {
           this.Title = pages[pages.Count - 1].Title;
       }
       else
       this.Title = this.CurrentPage.Title;
   }
}

This issue I am facing is: In below screenshot part1 is Homepage(title="Diary") & part2 is Childpage(title="Homework") when I change tab & again come to first tab than navigationbar title getting changed "Homework" to "Diary"(Screeshot2)

enter image description here

enter image description here

Upvotes: 5

Views: 7654

Answers (2)

Carodice
Carodice

Reputation: 266

As you are on your tabbed page already you can literally just do the following 

public partial class MyTabbedPage : TabbedPage
{
    public MyTabbedPage()
    {
        InitializeComponent();          
        CurrentPageChanged += CurrentPageHasChanged;
    }

    private void CurrentPageHasChanged(object sender, EventArgs e) => Title = CurrentPage.Title;
}

if you want to use the sender you can do the following

public partial class MyTabbedPage : TabbedPage
{
    public MyTabbedPage()
    {
        InitializeComponent();          
        CurrentPageChanged += CurrentPageHasChanged;
    }

    private void CurrentPageHasChanged(object sender, EventArgs e) 
    { 
        var tabbedPage = (TabbedPage) sender;
        Title = tabbedPage.CurrentPage.Title;
    }
}

Or if you can elaborate on what you are trying to do exactly I can give a better answer as I do not know what it is that you are trying to do exactly

Upvotes: 11

Gerald Versluis
Gerald Versluis

Reputation: 34013

I don't think you can achieve what you want to do, at least not like this. The event behaves the way it does and as described: it is fired whenever the current page changes, also for children.

That being said, I think you should focus on implementing the functionality you want with the tools we have. I can't really deduce from your code what you are trying to do, but it looks like you want to change the title? When a tab is changed? Why not just make some kind of condition to only do it for certain pages? For example when the page is contained in the Children collection?

Upvotes: 1

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