Retrieve an iOS App version and build number

AppInfo.swift

struct AppInfo {
    static func buildNumber() -> String {
        return AppInfo.infoDictionary["CFBundleVersion"] as! String
    }
    
    static func versionNumber() -> String {
        return AppInfo.infoDictionary["CFBundleShortVersionString"]as! String
    }
    
    private static var infoDictionary: [NSObject: AnyObject] {
        return NSBundle.mainBundle().infoDictionary!
    }
}