bundle

public extension Bundle {
    func infoStringForKey(_ key: String) -> String {
		return object(forInfoDictionaryKey: key) as? String ?? ""
	}

    var version: String { return infoStringForKey("CFBundleShortVersionString") }
    var build: String { return infoStringForKey("CFBundleVersion") }
	var displayName: String { return infoStringForKey("CFBundleDisplayName") }
	var identifier: String { return infoStringForKey("CFBundleIdentifier") }
}

public extension UIDevice {
    
    var identifier: String {
        var systemInfo = utsname()
        uname(&systemInfo)
        let mirror = Mirror(reflecting: systemInfo.machine)
        
        let identifier = mirror.children.reduce("") { identifier, element in
            guard let value = element.value as? Int8, value != 0 else { return identifier }
            return identifier + String(UnicodeScalar(UInt8(value)))
        }
        return identifier  // iPhone7,1
    }
}