How to change the container according to the index of a bottom navigation bar in flutter?

Question

I have this curved navigation bar but I don't know how to change the content of the container according to the index of the page. enter link description here

Answer 1

I found a solution: 1- Make ANY NUMBER of different screens and make Them a stateless widget for example. 2- import them to your Navigation bar screen. 3- Make a Widget and call it container Widget container; 4- Add SetState the container widget according to the index of the page to the onTap property and setState the Container Widget to The screen You want to show. 5- call your Widget container to child of another container() . And That's it