How do I scan a QR code with my camera roll?

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Tags

1. #camera
2. #import
3. #image
4. #album
5. #iphone
6. #reader
7. #scanning
8. #buttons
9. #start
10. #screen
11. #button
12. #corner
13. #browse
14. #bottom
15. #select
16. #photo
17. #right
18. #choose
19. #recognizer