ios - Equivalent of viewDidAppear in RCTViewManager -

i've created custom view react-native app, c++ dsp application , runs on timer. view initialised on startup using it's init method. in order save cpu cycles need know when view visible or not.

if using ios uiviewcontroller employ viewdidappear or viewwillappear send message c++ code start timer, , viewdiddisappear tell stop.

i'm looking clean way same within rctviewmanager.