iOS7Colors is a simple category on UIColor which provides you some of the standard colors used throughout iOS 7.
The easiest way to integrate iOS7Colors is using CocoaPods. Just add this to your Podfile:
pod 'iOS7Colors', '~> 2.0.0'
Usage is really simple. Just include UIColor+iOS7Colors.h & UIColor+iOS7Colors.m in your project if you're not using cocoapods and import the header file you need the colors.
#import "UIColor+iOS7Colors.h"
UILabel *label = [UILabel alloc] initWithFrame:CGRectZero];
label.textColor = [UIColor iOS7redColor];
The color values are taken from Louie Mantia's iOS 7 Color Swatches
iOS7Colors is licensed under the MIT-License