You could import a standard header file into all your controllers with several constants set for styling... example:
Styles.h
#define kFontSize 14
#define kFontFamily @"Helevetica"
Controller
#import "Styles.h" // at the top
myLabel.font = [UIFont fontWithName:kFontFamily size:kFontSize];
I personally think Interface Builder is the best way to style, however this answers your question directly.
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