Swift file not attaching itself to TabBar

Hi so I have a problem with my TabBar and that is that the TabBar isn't connected to my assigned swift file, I've connected the collection view cell to the tab1 (name of the class) but it's not working? What have I missed? I'll send a link to the whole code itself for a better understanding.

https://github.com/Gharfield/Tabbar.git

Thanks for any help!

Swift file not attaching itself to TabBar
 
 
Q