Swift 4 - Override AVAudioRecorder recording - ios

Question

I am using AvAudioRecorder for to make audio recordings in my iOS Application. I am able to make an initial recording, but I want to give the user the option of re-recording.
I have these defined:
var recordingSession: AVAudioSession!
var audioRecorder: AVAudioRecorder!
and In my viewDidLoad I have this:
recordingSession = AVAudioSession.sharedInstance()
do {
try recordingSession.setCategory(AVAudioSessionCategoryPlayAndRecord)
try recordingSession.setActive(true)
recordingSession.requestRecordPermission() { result in
DispatchQueue.main.async {
if(result == true)
{
}
else
{
}
}
}
}
catch
{
}
and then I have my record button:
#IBAction func recordButtonPressed(_ sender: Any) {
if audioRecorder == nil {
startRecording()
} else {
finishRecording(success: true)
}
}
and here are my start recording and finished recording methods:
func startRecording() {
audioFilename = getDocumentsDirectory().appendingPathComponent("recording.m4a")
let settings = [
AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
AVSampleRateKey: 12000,
AVNumberOfChannelsKey: 1,
AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
]
do {
audioRecorder = try AVAudioRecorder(url: audioFilename, settings: settings)
audioRecorder.delegate = self
audioRecorder.record()
recordButton.setTitle("Tap to Stop", for: .normal)
} catch {
finishRecording(success: false)
}
}
func finishRecording(success: Bool) {
audioRecorder.stop()
audioRecorder = nil
if success {
recordButton.setTitle("Tap to Re-record", for: .normal)
audioSlider.isHidden = false
playButton.isHidden = false
uploadButton.isHidden = false
do {
try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
try AVAudioSession.sharedInstance().setActive(true)
self.audioPlayer = try AVAudioPlayer(contentsOf: audioFilename)
self.audioPlayer?.prepareToPlay()
}catch{
}
} else {
recordButton.setTitle("Tap to Record", for: .normal)
}
}
The problem is whatever I try to re-record it does't. I tried setting the audioRecorder to nil after it was done recording, but that didn't help at all.