我试着记录下来，我可以在这里找到一个很好的答案: Recording audio in Swift

我可以让它发挥作用。但是现在我想知道如何播放录制的音频。从录音中我已经有了通用的 var audioRecorder，并定义了 url 路径。所以我尝试了 audioRecorder.play() 但它不起作用。

我想问题出在全局 var audioRecorder 是 AVAudioRecorder 的一个实例并且播放它应该是 AVAudioPlayer 的一个实例吗？这两个东西有什么关系？

我不想复制粘贴我想理解的和平代码。这就是我在这里简化代码的原因。请解释为什么它在此特定代码中不起作用以及如何解决它。

(我已经完成了很多相关的教程。问题是有太多代码让我迷路了。我在这里的问题是了解这个特定部分是如何工作的)

import AVFoundation
var audioRecorder:AVAudioRecorder!
@IBAction func record(sender: AnyObject) {       
    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)
    println(url)

    audioRecorder = AVAudioRecorder(URL:url, settings: nil, error: nil)
    audioRecorder.record()
}

@IBAction func play(sender: AnyObject) {
   // this gives the error 'AVAudioRecorder' does not have a member named 'play'
   // audioRecorder.play() 
}

最佳答案

这是录制音频然后将其存储到文件然后播放的完整工作代码:

import UIKit
import AVFoundation

class ViewController: UIViewController, AVAudioPlayerDelegate, AVAudioRecorderDelegate {

    @IBOutlet weak var recordButton: UIButton!
    @IBOutlet weak var stopButton: UIButton!
    @IBOutlet weak var playButton: UIButton!
    
    var audioPlayer : AVAudioPlayer?
    var audioRecorder : AVAudioRecorder?
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        playButton.enabled = false
        stopButton.enabled = false
        
        // getting URL path for audio
        let dirPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
        let docDir = dirPath[0] as! String
        let soundFilePath = docDir.stringByAppendingPathComponent("sound.caf")
        let soundFileURL = NSURL(fileURLWithPath: soundFilePath)
        println(soundFilePath)
        
        //Setting for recorder
        let recordSettings = [AVEncoderAudioQualityKey: AVAudioQuality.Min.rawValue,
            AVEncoderBitRateKey: 16,
            AVNumberOfChannelsKey : 2,
            AVSampleRateKey: 44100.0]
        var error : NSError?
        let audioSession = AVAudioSession.sharedInstance()
        audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord, error: &error)
        if let err = error{
            println("audioSession error: \(err.localizedDescription)")
        }
        audioRecorder = AVAudioRecorder(URL: soundFileURL, settings: recordSettings as [NSObject : AnyObject], error: &error)
        
        if let err = error{
            println("audioSession error: \(err.localizedDescription)")
        }else{
            audioRecorder?.prepareToRecord()
        }
    }
    //record audio
    @IBAction func recordAudio(sender: AnyObject) {
        
        if audioRecorder?.recording == false{
            playButton.enabled = false
            stopButton.enabled = true
            audioRecorder?.record()
        }
    }
    //stop recording audio
    @IBAction func stopAudio(sender: AnyObject) {
        
        stopButton.enabled = false
        playButton.enabled = true
        recordButton.enabled = true
        
        if audioRecorder?.recording == true{
            audioRecorder?.stop()
        }else{
            audioPlayer?.stop()
        }
    }
    //play your recorded audio
    @IBAction func playAudio(sender: AnyObject) {
        
        if audioRecorder?.recording == false{
            stopButton.enabled = true
            recordButton.enabled = false
            
            var error : NSError?
            
            audioPlayer = AVAudioPlayer(contentsOfURL: audioRecorder?.url, error: &error)
            
            audioPlayer?.delegate = self
            
            if let err = error{
                println("audioPlayer error: \(err.localizedDescription)")
            }else{
                audioPlayer?.play()
            }
        }
    }
    
    func audioPlayerDidFinishPlaying(player: AVAudioPlayer!, successfully flag: Bool) {
        recordButton.enabled = true
        stopButton.enabled = false
    }
    
    func audioPlayerDecodeErrorDidOccur(player: AVAudioPlayer!, error: NSError!) {
        println("Audio Play Decode Error")
    }
    
    func audioRecorderDidFinishRecording(recorder: AVAudioRecorder!, successfully flag: Bool) {
    }
    
    func audioRecorderEncodeErrorDidOccur(recorder: AVAudioRecorder!, error: NSError!) {
        println("Audio Record Encode Error")
    }
}

检查 THIS示例项目以获取更多信息。

在您的代码中，audioRecorder 用于录制音频，audioPlayer 用于播放音频。这就是为什么 audioRecorder 没有属性 play()

所以你不能使用audioRecorder.play()。

关于ios - Swift:播放录制的音频，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31721407/