UIKit中如何實現音頻錄制和播放功能

在UIKit中，可以使用AVFoundation框架來實現音頻錄制和播放功能。下面是一個簡單的示例代碼來演示如何實現音頻錄制和播放功能：

1. 導入AVFoundation框架

import AVFoundation

2. 創建錄音和播放器對象

var audioRecorder: AVAudioRecorder?
var audioPlayer: AVAudioPlayer?

3. 配置錄音設置

let settings = [
    AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
    AVSampleRateKey: 44100,
    AVNumberOfChannelsKey: 2,
    AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
]

4. 開始錄制音頻

func startRecording() {
    let audioSession = AVAudioSession.sharedInstance()
    do {
        try audioSession.setCategory(.playAndRecord, mode: .default)
        try audioSession.setActive(true)

        let audioFilename = getDocumentsDirectory().appendingPathComponent("recording.m4a")
        audioRecorder = try AVAudioRecorder(url: audioFilename, settings: settings)
        audioRecorder?.record()
    } catch {
        print("Recording failed")
    }
}

5. 結束錄制音頻

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

6. 播放錄制的音頻

func playRecordedAudio() {
    let audioFilename = getDocumentsDirectory().appendingPathComponent("recording.m4a")
    do {
        audioPlayer = try AVAudioPlayer(contentsOf: audioFilename)
        audioPlayer?.play()
    } catch {
        print("Playback failed")
    }
}

7. 獲取Documents目錄路徑

func getDocumentsDirectory() -> URL {
    let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
    return paths[0]
}

這樣就可以實現簡單的音頻錄制和播放功能。需要注意的是，在iOS開發中需要獲取錄音和播放音頻的權限，可以在Info.plist文件中添加對應的權限描述。