Mac OS X: find computer model identifier

modelIdentifier.swift

func modelIdentifier() -> String? {
    let service: io_service_t = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("IOPlatformExpertDevice"))
    let cfstr = "model" as CFString
    if let model = IORegistryEntryCreateCFProperty(service, cfstr, kCFAllocatorDefault, 0).takeUnretainedValue() as? NSData {
        if let nsstr =  NSString(data: model, encoding: NSUTF8StringEncoding) {
            return nsstr as String
        }
    }
    return nil
}

modelIdentifier() // "iMac14,2�"