AVAudioRecorder swift 2

Posted 2023-02-25

【中文标题】AVAudioRecorder swift 2

【英文标题】：

【发布时间】：2015-09-01 23:38:23

【问题描述】：

我的AVAudioRecorder 工作正常，但自从升级到 swift 2 后，我似乎无法弄清楚如何正确配置它。我不断收到错误消息，提示无法调用 AVAudioRecorder 初始化程序，但我提供的参数对我来说看起来是正确的。

var recordSettings = [AVSampleRateKey : NSNumber(float: Float(44100.0)),
    AVFormatIDKey : NSNumber(int: Int32(kAudioFormatMPEG4AAC)),
    AVNumberOfChannelsKey : NSNumber(int: 1),
    AVEncoderAudioQualityKey : NSNumber(int: Int32(AVAudioQuality.Medium.rawValue))]


var recordingURL: NSURL? = nil
var audioRecorder:AVAudioRecorder!


func directoryURL() -> NSURL? 

    let fileManager = NSFileManager.defaultManager()
    let urls = fileManager.URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)
    let documentDirectory = urls[0] as NSURL
    let soundURL = documentDirectory.URLByAppendingPathComponent("sound.m4a")
    return soundURL 


@IBAction func recordPressed(sender: AnyObject) 

    let audiosession: AVAudioSession = AVAudioSession.sharedInstance()

    do 
        try audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord)
     catch _ 
    

    do 
        try audioSession.setActive(true)
     catch _ 
    

    var error: NSError?

    audioRecorder = AVAudioRecorder(URL: recordingURL, settings: recordSettings, error: &error)

    if let e = error 

        print(e.localizedDescription, terminator: "")
    
    else
    
        audioRecorder.record()
        self.stopButton.enabled = true
        self.playButton.enabled = false
        self.recordButton.enabled = false

    

【问题讨论】：

recordingURL 与 directoryURL?您在directoryURL() 中返回文件的名称，这可能会引起一些混乱。

你好，布罗瑟夫。这是记录器的有用代码 => github.com/genedelisa/AVFoundationRecorder

【参考方案1】：

directoryURL 是正确的，但它似乎被误认为是 recordingURL。 recordSettings 也是连贯的。让我提供一个工作版本。

斯威夫特 3

var audioRecorder:AVAudioRecorder!

let recordSettings = [
    AVSampleRateKey : NSNumber(value: Float(44100.0)),
    AVFormatIDKey : NSNumber(value:Int32(kAudioFormatMPEG4AAC)),
    AVNumberOfChannelsKey : NSNumber(value: Int32(1)),
    AVEncoderAudioQualityKey :
        NSNumber(value: Int32(AVAudioQuality.medium.rawValue))]

override func viewDidLoad() 
    super.viewDidLoad()

    let audioSession = AVAudioSession.sharedInstance()
    do 
        try audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord)
        try audioRecorder = AVAudioRecorder(url: directoryURL()!,
                                            settings: recordSettings)
        audioRecorder.prepareToRecord()
     catch 


func directoryURL() -> URL? 
    let fileManager = FileManager.default
    let urls = fileManager.urls(for: .documentDirectory, in: .userDomainMask)
    let documentDirectory = urls[0] as URL
    let soundURL = documentDirectory.appendingPathComponent("sound.m4a")
    return soundURL


@IBAction func doRecordAction(_ sender: AnyObject) 
    if !audioRecorder.isRecording 
        let audioSession = AVAudioSession.sharedInstance()
        do 
            try audioSession.setActive(true)
            audioRecorder.record()
         catch 
    


@IBAction func doStopAction(_ sender: AnyObject) 
    audioRecorder.stop()
    let audioSession = AVAudioSession.sharedInstance()
    do 
        try audioSession.setActive(false)
     catch 

旧版：Swift 2

var audioRecorder:AVAudioRecorder!

let recordSettings = [AVSampleRateKey : NSNumber(float: Float(44100.0)),
    AVFormatIDKey : NSNumber(int: Int32(kAudioFormatMPEG4AAC)),
    AVNumberOfChannelsKey : NSNumber(int: 1),
    AVEncoderAudioQualityKey :
        NSNumber(int: Int32(AVAudioQuality.Medium.rawValue))]

override func viewDidLoad() 
    super.viewDidLoad()

    let audioSession = AVAudioSession.sharedInstance()
    do 
        try audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord)
        try audioRecorder = AVAudioRecorder(URL: self.directoryURL()!,
            settings: recordSettings)
        audioRecorder.prepareToRecord()
     catch 


func directoryURL() -> NSURL? 
    let fileManager = NSFileManager.defaultManager()
    let urls = fileManager.URLsForDirectory(.DocumentDirectory,
                                            inDomains: .UserDomainMask)
    let documentDirectory = urls[0] as NSURL
    let soundURL = documentDirectory.URLByAppendingPathComponent("sound.m4a")
    return soundURL 


@IBAction func doRecordAction(sender: AnyObject) 
    if !audioRecorder.recording 
        let audioSession = AVAudioSession.sharedInstance()
        do 
            try audioSession.setActive(true)
            audioRecorder.record()
         catch 
    


@IBAction func doStopAction(sender: AnyObject) 
    audioRecorder.stop()
    let audioSession = AVAudioSession.sharedInstance()

    do 
        try audioSession.setActive(false)
     catch 

---

► 在GitHub 上查找此解决方案，在Swift Recipes 上查找更多详细信息。

【讨论】：

我确实包含了大部分代码，但我跳过了它，因为它并没有真正参与正在显示的错误中。不过我会编辑它。

谢谢！我删除了内联错误参数并将其保留为 audioRecorder = AVAudioRecorder(URL: recordingURL!, settings: recordSettings) 并将其放在 do/catch 中。那个错误描述真的不清楚。