iOS 录音方法

iOS 录音功能

初始化AVAudioRecorder 对象

• 初始化一个AVAudioRecorder 对象

    init(url: URL, settings: [String : Any]) throws

• 参数

    1. url : 音频文件保存路径
    2. settings: 录制的属性
         * AVFormatIDKey: 音频格式 
         * AVSampleRateKey: 采样频率
         * AVNumberOfChannelsKey : 音频的通道数
         * AVLinearPCMBitDepthKey : 设置录制音频的每个样点的位数
         * AVLinearPCMIsBigEndianKey : 设置录制音频采用高位优先的记录格式
         * AVLinearPCMIsFloatKey : 置采样信号的浮点数

         ....还有很多其它属性，具体请看文档

    3. outError : 错误描述

配置和控制录音相关方法

    func prepareToRecord() -> Bool
        创建一个audio文件，准备录制

    func record() -> Bool
        启动或恢复录制。

    func record(atTime time: TimeInterval) -> Bool //延迟几秒录制

        NSTimeInterval recordDelay = 3.0;   //must be ≥ 0
       [myAudioRecorder recordAtTime:(myAudioRecorder.deviceCurrentTime + recordDelay)];

    //duration 最长录制时间
    func record(forDuration duration: TimeInterval) -> Bool

    func pause()  //暂停录制

    func stop()  //暂停录制

    func deleteRecording() -> Bool //删除录音文件

    var delegate: AVAudioRecorderDelegate? { get set }

    * func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, 
                                 successfully flag: Bool)
    *func audioRecorderEncodeErrorDidOccur(AVAudioRecorder, error: Error?)

例子

        let recorderSettings:[String:AnyObject] = [AVFormatIDKey : NSNumber(unsignedInt: kAudioFormatMPEG4AAC), AVSampleRateKey : 44100.0 as NSNumber, AVNumberOfChannelsKey : 2 as NSNumber, AVEncoderAudioQualityKey : AVAudioQuality.High.rawValue as NSNumber,AVEncoderBitRateKey : 320000 as NSNumber]
    
    do {
        audioRecorder = try AVAudioRecorder(URL: url, settings: recorderSettings)
        audioRecorder.delegate = self
        audioRecorder.prepareToRecord()
        
        try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayAndRecord)
        
    }catch let error as NSError{
        print(error)
    }