Passing arguments by value or by reference in objective C

Question

I\'m kind of new with objective c and I\'m trying to pass an argument by reference but is behaving like it were a value. Do you know why this doesn\'t work?

This is

Answer 1

Did you edit out code between this line

UILabel *startHourLabel;

and this line?

[self checkRedColorText:startHourLabel];

If not, the problem is that you're re-declaring your startHourLabel variable, so you're losing any sort of initialization that was there previously. You should be getting a compiler error here.