IOS Accessibility Feature - Switch Control

I have a question regarding app support for iOS Switch Control Accessibility. I tried looking for programming guides or APIs to find out how to make an app usable using Switch Control, but I couldn't, so I ask the community.

Anyway, I have an application, but it cannot be used by the Control Control, which will only determine the screen borders and the scrollbar. UI and text cannot be detected with the switch. I am trying to make an application available to users who are using Switch Control. Appreciate if I can get advice on how to make it available.