ZoomVideo Screen Share SDK in iOS

I have Implement the Zoom Video SDK in our app and we have successfully create the session and manage the call from one device to another, Now we are going to add the Share Screen Feature in our app using ZoomShareScreen SDK.
We have implment but not able to share the screen we are not able to call this method
onUserShareStatusChanged
Please let me know how we can add the screen share feature in our app.