Reusing view in UIPickerView with iOS 7

Question

EDIT 12-14-2015 : This problem is again frequently reported on iOS 7, iOS 8, iOS 9.... I think Apple want not of this control anymore, and should just forbi

Answer 1

I have reported my problem to Apple Technical Support. They confirm the bug :

There does indeed seem to be a difference between the behavior in iOS 6 and 7.

They ask me to report a bug on the bugreport tool. Now, just wait for the fix :)