A Swift extension to provide application version numbers and commonly used global constants

MNGApplicatioNExtensions.swift

//
//  MNGApplicatioNExtensions.swift
//  
//
//  Created by Tommie N. Carter, Jr., MBA on 6/22/15.
//  Copyright © 2015 MING Technology. All rights reserved.
//

import UIKit
import iAd

let userdefaults = NSUserDefaults.standardUserDefaults()
let defaultCenter = NSNotificationCenter.defaultCenter()
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate

extension UIApplication {

    private struct Constants {
        static let CFBundleShortVersionString = "CFBundleShortVersionString"

    }
    class func appVersion() -> String {
        return NSBundle.mainBundle().objectForInfoDictionaryKey(Constants.CFBundleShortVersionString) as! String
    }
    
    class func appBuild() -> String {
        return NSBundle.mainBundle().objectForInfoDictionaryKey(kCFBundleVersionKey as String) as! String
    }
    
    class func versionBuild() -> String {
        let version = appVersion(), build = appBuild()
        
        return version == build ? "v\(version)" : "v\(version)(\(build))"
    }
}