page redirect is not working for ios

Question

I have 4 ContentPage in my application portable class PageA PageB PageC PageD

Page a to page b come with

Navigation.InsertPageBefore(new PageB(),this); 
await Navigation.PopAsync();

From Page b to Page c redirect from code

Navigation.InsertPageBefore(new PageC(),this); 
await Navigation.PopAsync();

From Page C to Page D redirect from code

Navigation.InsertPageBefore(new PageD(),this); 
await Navigation.PopAsync();

Now I want to redirect the user from PageD To PageB

Navigation.InsertPageBefore(new PageB(),this); 
await Navigation.PopAsync();

I can come from PageA to PageD very smoothly. But trying to return from PageD to PageB I am getting an exception

Error before must be in the pushed stack of the current context

Stack track

at Xamarin.Forms.Internals.NavigationProxy.OnInsertPageBefore (Xamarin.Forms.Page page, Xamarin.Forms.Page before) [0x00020] in D:\\agent_work\\1\\s\\Xamarin.Forms.Core\\NavigationProxy.cs:150 at Xamarin.Forms.Internals.NavigationProxy.InsertPageBefore (Xamarin.Forms.Page page, Xamarin.Forms.Page before) [0x00000] in D:\\agent_work\\1\\s\\Xamarin.Forms.Core\\NavigationProxy.cs:59 at Test.PageD+d__9.MoveNext () [0x0007a] in E:\\Projects\\xamrine\\Source\\TestiOS\\PictureAfterSignature.xaml.cs:433

How can I resolve this issue?

Answer 1

I would recommend you to navigate this way :

Navigation.PushAsync(new PageA());

// In Page A
Navigation.PushAsync(new PageB());
Navigation.RemovePage(this);

// In Page B
Navigation.PushAsync(new PageC());

// In Page C
Navigation.PushAsync(new PageD());
Navigation.RemovePage(this);

Now if you see, PageB and PageD are only Pages in the Navigation stack.

In PageD, when you want to navigate to B, just call :

Navigation.PopAsync();

// PopAsync - removes the most recent page in stack.

Hope this helps!!