UIApplication extension to get app version / build
extension UIApplication {
    class func appVersion() -> String {
        return Bundle.main.object(forInfoDictionaryKey: "CFBundleShortVersionString") as! String
    }
    class func appBuild() -> String {
        return Bundle.main.object(forInfoDictionaryKey: kCFBundleVersionKey as String) as! String
    }
    class func versionBuild() -> String {
        let version = appVersion(), build = appBuild()
        return version == build ? "v\(version)" : "v\(version)(\(build))"
    }
}