Recording Audio in Swift 2

Recording audio in Swift is easy. Just follow these steps to record a new audio snippet and save it in the phone.

Steps to record audio with Swift 2

  1. Implement an AVAudioSession
  2. Set the audiosession’s category to AVAudioSessionCategoryPlayAndRecord
  3. Set the audiosession’s active state to true
  4. Get the documents directory and set a path to the new recording file that will be created. Create a NSURL type variable with that path.
  5. Create a settings object to be passed into the recorded. (see example below)
  6. Create an AVAudioRecorder, and record with it’s .record() method.

Record Audio in Swift 2.0 Example

func record() {
    //init
    let audioSession:AVAudioSession = AVAudioSession.sharedInstance()

    //ask for permission
    if (audioSession.respondsToSelector("requestRecordPermission:")) {
        AVAudioSession.sharedInstance().requestRecordPermission({(granted: Bool)-> Void in
            if granted {
                print("granted")

                //set category and activate recorder session
                try! audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord)
                try! audioSession.setActive(true)


                //get documnets directory
                let documentsDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
                let fullPath = documentsDirectory.stringByAppendingPathComponent("voiceRecording.caf")
                let url = NSURL.fileURLWithPath(fullPath)

                //create AnyObject of settings
                let settings: [String : AnyObject] = [
                    AVFormatIDKey:Int(kAudioFormatAppleIMA4), //Int required in Swift2
                    AVSampleRateKey:44100.0,
                    AVNumberOfChannelsKey:2,
                    AVEncoderBitRateKey:12800,
                    AVLinearPCMBitDepthKey:16,
                    AVEncoderAudioQualityKey:AVAudioQuality.Max.rawValue
                ]

                //record
                try! self.audioRecorder = AVAudioRecorder(URL: url, settings: settings)

            } else{
                print("not granted")
            }
        })
    }

}

Record Audio in Swift 1.0 Example

//declare instance variable 
var audioRecorder:AVAudioRecorder!


func record(){

    var audioSession:AVAudioSession = AVAudioSession.sharedInstance()
    audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord, error: nil)
    audioSession.setActive(true, error: nil)

    var documents: AnyObject = NSSearchPathForDirectoriesInDomains( NSSearchPathDirectory.DocumentDirectory,  NSSearchPathDomainMask.UserDomainMask, true)[0]
    var str =  documents.stringByAppendingPathComponent("recordTest.caf")
    var url = NSURL.fileURLWithPath(str as String)

    var recordSettings = [AVFormatIDKey:kAudioFormatAppleIMA4,
        AVSampleRateKey:44100.0,
        AVNumberOfChannelsKey:2,AVEncoderBitRateKey:12800,
        AVLinearPCMBitDepthKey:16,
        AVEncoderAudioQualityKey:AVAudioQuality.Max.rawValue

    ]

    println("url : \(url)")
    var error: NSError?

    audioRecorder = AVAudioRecorder(URL:url, settings: recordSettings, error: &error)
    if let e = error {
        println(e.localizedDescription)
    } else {

        audioRecorder.record()
    }


}