Decrypt UIViewController property warning

Question

I cannot understand what the warning is that I get on Xcode. Searching it on Google did not help. If anyone had met this warning before, it would be great if I could understand how I could get rid of it.

Screenshot (updated):

http://imagebin.antiyes.com/images/0116033001255720169_90.png

Thanks again.

EDIT: Warning Messages for Future Search
warning: property 'title' 'copy' attribute does not match super class 'UIViewController' property
warning: property 'title' type does not match super class 'UIViewController' property type

Answer 1

"title" PageViewController, title, UIViewController. , , UIViewController. , , .

, . - vs. keep vs. assign ( " ", ). title - , UIViewController, .