解决ios录音的具体操作步骤

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mob649e815f0f18 2023-07-12 13:43:45 ©著作权

文章标签 swift iOS 示例代码 文章分类 iOS 移动开发

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iOS录音

在iOS开发中，我们经常需要用到录音功能，比如录制语音备忘录、语音消息、语音识别等。iOS提供了AVFoundation框架来实现录音功能。本文将介绍如何在iOS应用中使用AVFoundation框架实现录音功能，并提供代码示例。

AVAudioRecorder

AVAudioRecorder是AVFoundation框架中用于录音的类。下面是使用AVAudioRecorder录音的基本步骤：

导入AVFoundation框架：
```
import AVFoundation
```

设置录音会话：

let session = AVAudioSession.sharedInstance()
try? session.setCategory(.playAndRecord, mode: .default, options: [])
try? session.setActive(true)

创建录音文件的URL：

let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
let audioFilename = documentsPath + "/recording.wav"
let audioURL = URL(fileURLWithPath: audioFilename)

配置录音设置：

let settings: [String: Any] = [
    AVFormatIDKey: kAudioFormatLinearPCM,
    AVSampleRateKey: 44100.0,
    AVNumberOfChannelsKey: 2,
    AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
]

创建AVAudioRecorder实例：

let recorder = try? AVAudioRecorder(url: audioURL, settings: settings)
recorder?.prepareToRecord()

开始录音：
```
recorder?.record()
```
停止录音：
```
recorder?.stop()
```

示例代码

下面是一个简单的示例代码，实现了录音和停止录音功能：

import AVFoundation

class Recorder {
    var audioRecorder: AVAudioRecorder?
    var isRecording: Bool = false

    func startRecording() {
        let session = AVAudioSession.sharedInstance()
        try? session.setCategory(.playAndRecord, mode: .default, options: [])
        try? session.setActive(true)

        let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
        let audioFilename = documentsPath + "/recording.wav"
        let audioURL = URL(fileURLWithPath: audioFilename)

        let settings: [String: Any] = [
            AVFormatIDKey: kAudioFormatLinearPCM,
            AVSampleRateKey: 44100.0,
            AVNumberOfChannelsKey: 2,
            AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
        ]

        audioRecorder = try? AVAudioRecorder(url: audioURL, settings: settings)
        audioRecorder?.prepareToRecord()
        audioRecorder?.record()
        isRecording = true
    }

    func stopRecording() {
        audioRecorder?.stop()
        isRecording = false
        audioRecorder = nil
    }
}

你可以在你的iOS应用中使用以上代码来实现录音功能。通过调用startRecording()方法开始录音，调用stopRecording()方法停止录音。