Why My iPhone 5 Camera Purple Lines Interference ?

Basic troubleshooting steps right from the User Guide are restart, reset, restore from backup, restore as new. If you've tried ALL these steps and your problem(s) persist, then you'll need to bring your phone to Apple for evaluation. The iPhone 5 is still under warranty, so if a hardware issue is found, your phone will be replaced free of charge provided there's no user damage.

my phone is not working after the the purple thing start showing up on the screen>now its completely black