Question - how can add frameListener on ios?

Hi team, I found addFrameListener in m75 webrtc android source here

so I can add event listener in WebRTCView.java
surfaceViewRenderer.addFrameListener(new FrameListener(){...})

Is the way to add FrameListener on ios too? (I am not familiar with objectC)

I could get buffer from startCaptureWithHandler and convert it to image