It’s surprisingly easy to record your iPhone, iPad, or iPod touch’s screen with this little known method that’s built into Apple’s software.
This screen recording technique is so pure, in fact, that Apple recommends using it on its developer website to create app previews, those short videos that some apps have to showcase what they can do. So, to record your iOS device’s screen in the way that Apple intends you to, your going to need a Lightning to USB cable (the charging cable that comes with newer iOS devices), a Mac, and, of course, an iOS device with a Lightning port. Anyways, your iPhone, iPad, or iPod touch (whichever one’s screen your recording) needs to be running iOS 8 or later and your Mac needs to be running OS X Yosemite or later.
Now that you’ve got all of your necessary gadgets and your cable together, grab your Lightning to USB cable and plug it into your iOS device and your Mac. Then, simply unlock your iOS device and tap the “Trust” button in the pop-up box that should appear, asking you if your device can trust the computer that it’s plugged into. Next, go on your Mac and open up QuickTime Player, which comes preinstalled on Macs. In QuickTime Player, go up to the menu bar and select “File” then “New Movie Recording.” In the new window that appears, move your mouse to the dropdown arrow next to the record button and select your iOS device’s name from the list of input devices. From there, your iOS device’s screen should appear on your Mac, and you can start recording it whenever you're ready by clicking the record button on your Mac.