AVFoundation - AVAudioRecorder

开启录音权限

NSMicrophoneUsageDescription

录音权限请求

AVAudioSession.sharedInstance().requestRecordPermission({(granted: Bool)-> Void in
    if granted {
        print("record permission granted")
    } else{
        print("record permission not granted")
    }
})

AVAudioSession 场景设置

let session: AVAudioSession = AVAudioSession.sharedInstance()
do {
    try session.setCategory(.playAndRecord)
    try session.setActive(true)
} catch {
    print(error)
}

Recorder URL

let fileName = "test1.caf"
var documentDictory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first

let tempDir = NSTemporaryDirectory()
let filePath = tempDir.appending(fileName)
let fileUrl = URL.init(fileURLWithPath: filePath)

AVAudioRecorder Setting

注意这里的 Dictionary Value 需要为 NSNumber，否则 AVAudioRecorder 初始化会失效

let settings: [String: NSNumber] = [
    AVFormatIDKey: NSNumber.init(value: kAudioFormatAppleIMA4) , // kAudioFormatAppleIMA4, kAudioFormatMPEG4AAC, 等
    AVSampleRateKey: NSNumber.init(value: 44100.0),
    AVNumberOfChannelsKey: NSNumber.init(value: 2),
    AVEncoderAudioQualityKey: NSNumber.init(value: AVAudioQuality.medium.rawValue),
    AVEncoderBitRateKey: NSNumber.init(value: 320000)
]

AVAudioRecorder 初始化

do {
    let recorder = try AVAudioRecorder.init(url: fileUrl, settings: settings)
    recorder.delegate = self
    recorder.isMeteringEnabled = true
    if recorder.prepareToRecord() {
        recorder.record()
    }else {
        print("recorder prepare to record failed.")
    }
    self.recorder = recorder
} catch  {
    print("AVAudioRecorder inital error \(error.localizedDescription)")
}

AVAudioRecorder Operation

• record()
• stop()
• isRecording()