recording audio in swift and passing the recorded audio to the next view controller - ios

Question

I am trying to record Audio, and pass the recorded audio, to the next view controller. Here is my code for recording Audio
class RecordSoundsViewController: UIViewController, AVAudioRecorderDelegate {
#IBOutlet weak var recording: UILabel!
#IBOutlet weak var recordButton: UIButton!
#IBOutlet weak var stopButton: UIButton!
var audioRecorder:AVAudioRecorder!
var recordedAudio : RecordedAudio!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func viewWillAppear(animated: Bool) {
// enables record button
// hides the stop button
recordButton.enabled = true
stopButton.hidden = true
}
#IBAction func recordAudio(sender: UIButton) {
//Shows recording label
recording.hidden = false
//diabling record button
recordButton.enabled = false
stopButton.hidden = false
//Filepath Creation
let dirPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as! String
let currentDateTime = NSDate()
let formatter = NSDateFormatter()
formatter.dateFormat = "ddMMyyyy-HHmmss"
let recordingName = formatter.stringFromDate(currentDateTime)+".wav"
let pathArray = [dirPath, recordingName]
let filePath = NSURL.fileURLWithPathComponents(pathArray)
println(filePath)
// Recording Session
var session = AVAudioSession.sharedInstance()
session.setCategory(AVAudioSessionCategoryPlayAndRecord, error: nil)
audioRecorder = AVAudioRecorder(URL: filePath, settings: nil, error: nil)
audioRecorder.delegate = self
audioRecorder.meteringEnabled = true
audioRecorder.prepareToRecord()
audioRecorder.record()
}
func audioRecorderDidFinishRecording(recorder: AVAudioRecorder!, successfully flag: Bool) {
// ToDo create recorded audio file
if(flag)
{ recordedAudio = RecordedAudio()
recordedAudio.filepathURL = recorder.url
recordedAudio.title = recorder.url.lastPathComponent
// ToDo Perform segue
self.performSegueWithIdentifier("stopRecording", sender: recordedAudio)
}
else {
println("Recording was unsuccessfull")
stopButton.hidden = true
recordButton.enabled = true
}
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if(segue == "stopRecording") {
let PlaySoundsVC:PlaySoundsViewController = segue.destinationViewController as! PlaySoundsViewController
let data = sender as! RecordedAudio
PlaySoundsVC.receivedAudio = data
}
}
#IBAction func stopAudio(sender: UIButton) {
// Hides recording
recording.hidden = true
audioRecorder.stop()
var audioSession = AVAudioSession.sharedInstance()
audioSession.setActive(false, error: nil)
}
}
My Model class is ,
import Foundation
class RecordedAudio : NSObject{
var filepathURL :NSURL!
var title : String!
}
Here is how My second viewcontroller catch the data and uses it,
class PlaySoundsViewController: UIViewController {
var audioPlayer: AVAudioPlayer!
var receivedAudio: RecordedAudio!
func rateplay (rtt : Float32) {
audioPlayer.stop()
audioPlayer.rate = rtt
audioPlayer.currentTime = 0.0
audioPlayer.play()
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
// if var filePath = NSBundle.mainBundle().pathForResource("movie_quote", ofType: "mp3")
// {
// // if path is there for mp3
// let filepathurl = NSURL.fileURLWithPath(filePath)
//
// // println(receivedAudio.title)
//
// }
// else {
// println("Path is empty")
//
// }
audioPlayer = AVAudioPlayer(contentsOfURL: receivedAudio.filepathURL, error: nil)
audioPlayer.enableRate = true
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func playSlow(sender: UIButton) {
// play sloooowllyyyyy
audioPlayer.stop()
audioPlayer.rate = 0.5
audioPlayer.currentTime = 0.0
audioPlayer.play()
}
#IBAction func playFast(sender: UIButton) {
rateplay(1.5)
}
#IBAction func stopAudio(sender: UIButton) {
audioPlayer.stop()
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
Untill I add the below code,
audioPlayer = AVAudioPlayer(contentsOfURL: receivedAudio.filepathURL, error: nil)
audioPlayer.enableRate = true
I was able to move to the second scene, which means, the audio is successfully recorded. But as soon as i access the data like "receivedAudio.filepathURL" I am getting the error,
fatal error: unexpectedly found nil while unwrapping an Optional value

Answer 1

In the prepareForSegue function of the RecordSoundsViewController you need to write segue.identifier == "stopRecording" as the condition.
Currently you have segue == "stopRecording".
Happy Coding!