Record iOs screen on OS X

1. Plug your iPhone to your computer with an official Apple cable.
2. Open QuickTime Player.
3. Click on File then New Movie Recording.
4. Near the red recording button, click the small white arrow:
5. Select iPhone for both "Camera" and "Microphone".
6. Turn the volume up. You should now hear the sound that was originally from your iPhone playing on your computer's speakers.
7. Open what you want to record on your iPhone and once you're ready, click the red recording button.
8. Once you're done, click the button again to stop.
9. If you need to trim the beginning or end of your video, you can do so by typing Command + T or click Edit then Trim....
10. Then just type Command + S or click File then Save... to save your video.