If you try to live stream screen to facebook or YouTube, you can use Omlet Arcade. Here is the tutorial from Official video, but if you only need to record the screen, maybe “screen mirroring” is enough.
【Before Starting the Stream】
Step 1: Swipe open the Control Center to make sure recording button is present. If not, follow the next steps to enable it.
Step 2: Open Settings and go to the Control Center.
Step 3: Open Customize Controls and add Screen Recording to the include list.
【Start Live Streaming】
Step 4: Log in to Omlet Arcade and choose a platform to stream.
Step 5: Swipe open the Control Center and long press the screen recording button.
Step 6: Choose Omlet Arcade and press Start Broadcast to start streaming.
Step 7: Check your live message while streaming from Omlet
【Stop Live Streaming】
Step 8: Open Omlet Arcade to stop streaming.