Firstly, I must explain this, I know this green bar appears if your app has support for CallKit and user went to background state from app, And these all works perfectly from my VOIP app.
But I want to implement something like Whatsapp iOS App which user can go to back instant message screen from a voice call and even client is in the active state, a green bar appears.
I do not know how WhatsApp has implemented this feature. But I guess it can be custom view (green bar when the app is in an active state but not in call screen).
Do you guys have any idea how can I implement this feature? Or Do the CallKit has any methods or something else to force to show green bar if the call screen is not appearing but also app is not in background state??