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A PHP Error was encountered

Severity: Notice

Message: Undefined index: userid

Filename: views/question.php

Line Number: 191

Backtrace:

File: /home/prodcxja/public_html/questions/application/views/question.php
Line: 191
Function: _error_handler

File: /home/prodcxja/public_html/questions/application/controllers/Questions.php
Line: 433
Function: view

File: /home/prodcxja/public_html/questions/index.php
Line: 315
Function: require_once

name Punditsdkoslkdosdkoskdo

Xamarin fixed navigation bar

How can I have a fixed footer like Instagram through multiple pages in a xamarin forms app without determining it on every page?

I find out I can use a nuget package to make this like a tapped page but it makes me write all the codes in one page like this:

https://www.youtube.com/watch?v=Cp_2F621Az0

how can I implement this more efficiently