Question

Suppose I have a UIColor that I want to use across every view controller to tint it’s title/navigation bar. I was wondering what is the best way to declare such a property. Should I declare it as a member of the application delegate? Create a model class for global properties, and declare a static function + (UIColor)getTitleColor? Pass the UIColor object to every view controller? Is there another method that I did not describe, that is viewed as being the best way to go about this?

Answer 1

There are lots of ways to do this. I like to do it by putting a category on UIColor:

UIColor+MyAppColors.h

@interface UIColor (MyAppColors)

+ (UIColor *)MyApp_titleBarBackgroundColor;

@end

UIColor+MyAppColors.m

#import "UIColor+MyAppColors.h"

@implementation UIColor (MyAppColors)

+ (UIColor *)MyApp_titleBarBackgroundColor {
    static UIColor *color;
    static dispatch_once_t once;
    dispatch_once(&once, ^{
        color = [UIColor colorWithHue:0.2 saturation:0.6 brightness:0.7 alpha:1];
    });
    return color;
}

@end

Then I can use it by importing UIColor+MyAppColors.h in any file that needs the title bar background color, and calling it like this:

myBar.tintColor = [UIColor MyApp_titleBarBackgroundColor];