How do I setup an AVAudioRecorder?

Programming Languages Swift
p.knausst
p.knausst OP
Created Feb ’17
Replies 4
Boosts 0
Views 4.1k
Participants 2

Hello,


I am trying to record something, but I get an error in the setup with my AVAudioRecorder:


Cannot invoke initializer for type 'AVAudioRecorder' with an argument list of type '(url: NSURL, settings: [String : Any], error: inout NSError?)'


I'm not sure whats wrong here. Heres my code:


var soundRecorder = AVAudioRecorder()
    var soundPlayer = AVAudioPlayer()
   
    var fileName = "audioFile.m4a"
   
    override func viewDidLoad() {
        super.viewDidLoad()
        /
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        /
    }
   
    func setupRecorder() {
        var recordSettings = [ AVFormatIDKey : kAudioFormatAppleLossless,
                               AVEncoderAudioQualityKey : AVAudioQuality.max.rawValue,
                               AVEncoderBitRateKey: 320000,
                               AVNumberOfChannelsKey : 2,
                               AVSampleRateKey : 44100.0 ] as [String : Any]
       
        var error : NSError?
       
        soundRecorder = AVAudioRecorder(url: getFileURL(), settings: recordSettings, error: &error)
    }
   
    func getCacheDirectory() -> String{
        let paths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)
        return paths[0]
    }
    func getFileURL() -> NSURL{
        let path = getCacheDirectory().appending(fileName)
        let filePath = NSURL(fileURLWithPath: path)
        return filePath
    }


THANKS FOR HELPING!

Answered by DTS Engineer in 211568022

I'm using Xcode Version 8.2.1 and Swift 3.

OK. In that case it seems like you’ve not done your Swift 3 conversion properly. Specifically, on line 24 you’re creating an 

AVAudioRecorder
as if you were programming in Swift 2. Swift 3 imports this 
AVAudioRecorder
initialiser as: 
init(url: URL, settings: [String : Any]) throws

which means you need to:

  • Call it with a Swift 3 

    URL
    value, rather than the NSURL returned by 
    getFileURL()

  • Handle any potential error using Swift’s error handling mechanism

The best way to fix the first point is to rewrite lines 27 through 35 to use 

URL
. Here’s how you’d do the equivalent in Swift 3: 
let fileName = "audioFile.m4a"
let docDirURL = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
let fileURL = docDirURL.appendingPathComponent(fileName)

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware 

let myEmail = "eskimo" + "1" + "@apple.com"
Replies  4
Boosts  0
Views  4.1k
Participants  2
Apple Staff, DTS Engineer
DTS Engineer OP
Apple
Feb ’17

I am trying to record something, but I get an error in the setup with my AVAudioRecorder:

What version of Xcode are you using? And, if it’s an Xcode 8 flavour, what version of Swift?

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware 

let myEmail = "eskimo" + "1" + "@apple.com"
0
p.knausst
p.knausst OP
Feb ’17

I'm using Xcode Version 8.2.1 and Swift 3.

0
Apple Staff, DTS Engineer
DTS Engineer OP
Apple
Feb ’17
Accepted Answer

I'm using Xcode Version 8.2.1 and Swift 3.

OK. In that case it seems like you’ve not done your Swift 3 conversion properly. Specifically, on line 24 you’re creating an 

AVAudioRecorder
as if you were programming in Swift 2. Swift 3 imports this 
AVAudioRecorder
initialiser as: 
init(url: URL, settings: [String : Any]) throws

which means you need to:

  • Call it with a Swift 3 

    URL
    value, rather than the NSURL returned by 
    getFileURL()

  • Handle any potential error using Swift’s error handling mechanism

The best way to fix the first point is to rewrite lines 27 through 35 to use 

URL
. Here’s how you’d do the equivalent in Swift 3: 
let fileName = "audioFile.m4a"
let docDirURL = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
let fileURL = docDirURL.appendingPathComponent(fileName)

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware 

let myEmail = "eskimo" + "1" + "@apple.com"
0
p.knausst
p.knausst OP
Feb ’17

Thank you! It works!


Here my working code for those who have the same problem:


let recordSettings = [ AVFormatIDKey : kAudioFormatAppleLossless,
                               AVEncoderAudioQualityKey : AVAudioQuality.max.rawValue,
                               AVEncoderBitRateKey: 320000,
                               AVNumberOfChannelsKey : 2,
                               AVSampleRateKey : 44100.0 ] as [String : Any]
       
let docDirURL = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
let fileURL = docDirURL.appendingPathComponent(fileName)
       
soundRecorder = try! AVAudioRecorder.init(url: fileURL, settings: recordSettings)
0
How do I setup an AVAudioRecorder?
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