Relies on SwiftHEXColors for some nice UIColor extensions https://github.com/thii/SwiftHEXColors

AppearanceManager.swift

//
//  AppearanceManager.swift
//
//  Created by Ben Dalziel on 2/17/16.
//

import UIKit

class AppearanceManager {

    class func styleUINavigationBar() {
        MyUINavigationBar.appearance().backgroundColor = ColorUtil.uiColor(AppUIColors.NavBarBackground)
        MyUINavigationBar.appearance().tintColor = ColorUtil.uiColor(AppUIColors.NavBarTint)
    }
    
}
  

ColorUtil.swift

//
//  ColorUtil.swift
//
//  Created by Ben Dalziel on 2/17/16.
//

import SwiftHEXColors

public indirect enum AppUIColors: Int {
    case NavBarBackground,
    NavBarTint,
    NavBarShadow
}

class ColorUtil {
    
    enum AppColors: String {
        case Beige          = "#f5efe0",
        Gold                = "#cda582",
        
        // Alternate colors - use sparingly
        GoldAlt             = "#e1b996"
    }
    
    class func uiColor(appUIColor: AppUIColors) -> UIColor {
        switch appUIColor {
        case .NavBarBackground:
            return color(AppColors.Beige)
        case .NavBarTint :
            return color(AppColors.Gold)
        case .NavBarShadow :
            return colorWithAlpha(AppColors.GoldAlt, alpha: 0.7)
        }
    }
    
    // Conveniences unwrap raw value hex color value from enum
    
    class func color(appColor: AppColors) -> UIColor {
        return UIColor(hexString: appColor.rawValue)!
    }
    
    class func colorWithAlpha(appColor: AppColors, alpha: Float) -> UIColor {
        return UIColor(hexString: appColor.rawValue, alpha: alpha)!
    }
    
}