Code to Record Audio in iOS Swift

class RecordAudioViewController: UIViewController, AVAudioRecorderDelegate, AVAudioPlayerDelegate {

    var nameBaby: String = ""
    var isRecording: Bool = false
    var audioRecorder: AVAudioRecorder!
    var audioPlayer: AVAudioPlayer!


    @IBOutlet weak var btn_recordName: UIButton!

    @IBOutlet weak var lbl_recdString: UILabel!

    @IBOutlet weak var btn_play: UIButton!

    @IBAction func action_btn_recordName(sender: AnyObject) {

        println("in onCLick of action_btn_recordName")

        if isRecording == true {
            isRecording = false

            if audioRecorder?.recording == true {
                audioRecorder?.stop()
            } else {
                audioPlayer?.stop()
            }

        } else {
            isRecording = true

            //Start Recording here
            audioRecorder?.record()
        }
    }



    @IBAction func action_btn_play(sender: AnyObject) {

        if audioRecorder?.recording == false {

            var error: NSError?

            audioPlayer = AVAudioPlayer(contentsOfURL: audioRecorder?.url,
                error: &error)

            audioPlayer?.delegate = self

            if let err = error {
                println("audioPlayer error: \(err.localizedDescription)")
            } else {
                audioPlayer?.play()
            }
        }
    }

    override func viewDidLoad() {
        println("in viewDidLoad of RecordAudioViewController")
        btn_recordName.setTitle("Record", forState: UIControlState.Normal)
        btn_recordName.setTitle("Stop", forState: UIControlState.Highlighted)
        lbl_recdString.text = nameBaby


        prepareForRecording()



    }


    func prepareForRecording() {
        //Trial 2 - for setting up recording audio
        // http://www.techotopia.com/index.php/Recording_Audio_on_iOS_8_with_AVAudioRecorder_in_Swift
        let dirPaths =
        NSSearchPathForDirectoriesInDomains(.DocumentDirectory,
            .UserDomainMask, true)
        let docsDir = dirPaths[0] as! String
        let soundFilePath =
        docsDir.stringByAppendingPathComponent("sound.caf")
        let soundFileURL = NSURL(fileURLWithPath: soundFilePath)
        let recordSettings =
        [AVEncoderAudioQualityKey: AVAudioQuality.Min.rawValue,
            AVEncoderBitRateKey: 16,
            AVNumberOfChannelsKey: 2,
            AVSampleRateKey: 44100.0]

        var error: NSError?

        let audioSession = AVAudioSession.sharedInstance()
        audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord,
            error: &error)

        if let err = error {
            println("audioSession error: \(err.localizedDescription)")
        }

        audioRecorder = AVAudioRecorder(URL: soundFileURL,
            settings: recordSettings as [NSObject : AnyObject], error: &error)

        if let err = error {
            println("audioSession error: \(err.localizedDescription)")
        } else {
            audioRecorder?.prepareToRecord()

        }



    }


}