Thanks to the incorporation of a native option to Screen Record ( iPhone, Pods and iPad), since iOS 11 it is no longer necessary to resort to an external application to record the iPhone screen; In addition, the process is quite simple. This is what you need to know.
This is how to record the screen of your iPhone or iPad, using the iOS screen recording function.
Record your screen
Go to Settings > Control Center, then tap the Add button next to Screen Recording.
From the top right, swipe down to open Control Center on your iPhone or iPod touch, or on your iPad.
Tap the gray record button, to start recording the screen.
To stop recording, tap the red record button, red record icon at the top left of your screen and select Stop.
Apple has made screen recording a really simple process. Just open Control Center and tap the Screen Record icon.