ios 边录音边放_iOS开发：AVPlayer实现流音频边播边存

可以使用AVAudioRecorder和AVPlayer来实现在iOS设备上边录音边播放。具体步骤如下：

1. 配置AVAudioSession，设置播放和录音的类别和模式：

let session = AVAudioSession.sharedInstance()
try? session.setCategory(.playAndRecord, mode: .default, options: [.defaultToSpeaker, .allowBluetoothA2DP])
try? session.setActive(true)

2. 创建AVAudioRecorder实例，设置录音参数和文件路径：

let recordSettings = [
    AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
    AVSampleRateKey: 44100,
    AVNumberOfChannelsKey: 1,
    AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
]
let audioURL = URL(fileURLWithPath: NSTemporaryDirectory() + "recording.m4a")
let audioRecorder = try? AVAudioRecorder(url: audioURL, settings: recordSettings)
audioRecorder?.prepareToRecord()
audioRecorder?.record()

3. 创建AVPlayer实例，设置播放URL和缓存：

let audioURL = URL(string: "http://example.com/audio.mp3")!
let playerItem = AVPlayerItem(url: audioURL)
let player = AVPlayer(playerItem: playerItem)
player.automaticallyWaitsToMinimizeStalling = false
player.play()

4. 在AVPlayer的代理方法中，检查缓存是否够用，如果不够用就暂停AVPlayer，等待缓存：

func player(_ player: AVPlayer, didOutputCueMarkers markers: [AVMetadataItem], at time: CMTime) {
    let currentTime = player.currentTime()
    let bufferDuration = CMTimeGetSeconds(player.currentItem?.loadedTimeRanges.first?.timeRange.duration ?? CMTime.zero)
    let playbackDuration = CMTimeGetSeconds(currentTime)
    if bufferDuration - playbackDuration < 5 {
        player.pause()
    } else {
        player.play()
    }
}

这样就可以在iOS设备上边录音边播放了。注意，由于网络传输和设备性能的限制，可能会出现播放卡顿或录音失真的情况。