Can not change UILabel text color

by

UIColor’s RGB components are scaled between 0 and 1, not up to 255.

Try 

categoryTitle.textColor = [UIColor colorWithRed:(188/255.f) green:... blue:... alpha:1.0];

In Swift:

categoryTitle.textColor = UIColor(red: 188/255.0, green: ..., blue: ..., alpha: 1)

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