ios开发——实用技术篇Swift篇&录音

录音

     // MARK: - 录音
     /*----- 录音 ------*/

     var recorder:AVAudioRecorder?   //录音器
     var player:AVAudioPlayer?   //播放器
     var recorderSettingsDic:[NSObject : AnyObject]?   //录音器设置参数数组
     var volumeTimer:NSTimer!//定时器线程， 刷新音量
     var aacPath:String? //录音存储路径

      @IBOutlet var soundLodingImageView:UIImageView!//录音音量显示视图

     //按下录音
     @IBAction func downAction()
     {
         var error:NSError?

         //初始化录音器
         recorder = AVAudioRecorder(URL: NSURL(string: aacPath!), settings: recorderSettingsDic, error:  &error)

         if ((recorder) != nil) {

             //开启仪表计数功能
             recorder!.meteringEnabled = true;

             //准备录音
             recorder!.prepareToRecord()

             //开始录音
             recorder!.record()

             //启动定时器 定时更新录音音量
             volumeTimer = NSTimer.scheduledTimerWithTimeInterval(0.1, target: self, selector: "levelTimer", userInfo: nil, repeats: true)
         }

     }

      //松开 结束录音
     @IBAction func upAction()
     {
         //停止录音
         recorder?.stop()

         //录制器释放
         recorder = nil

         //暂停定时器
         volumeTimer.invalidate()
         volumeTimer = nil

         //界面音量归0现实
         soundLodingImageView.image = UIImage(named: "RecordingSignal001")
     }

     //播放录制的声音
     @IBAction func playAction()
     {
         var playerError:NSError?

         //播放
         player = nil;
         player = AVAudioPlayer(contentsOfURL: NSURL(string: aacPath!), error: &playerError)

         if (player == nil)
         {
             println("ERror creating player: \(playerError?.description)")
         }else{
             player?.play()
         }
     }

     //定时器方法--检测录音音量
     func levelTimer()
     {
         recorder!.updateMeters()//刷新音量数据

         let averageV:Float = recorder!.averagePowerForChannel()//获取音量的平均值

         let maxV:Float = recorder!.peakPowerForChannel()//获取音量的最大值

         let lowPassResults:Double = pow(Double(), Double(0.05 * maxV))
         println("\(lowPassResults)")

         if (lowPassResults>=0.8) {
             soundLodingImageView.image = UIImage(named: "RecordingSignal8.png")
         }else if(lowPassResults>=0.7){
             soundLodingImageView.image = UIImage(named: "RecordingSignal7.png")
         }else if(lowPassResults>=0.6){
             soundLodingImageView.image = UIImage(named: "RecordingSignal6.png")
         }else if(lowPassResults>=0.5){
             soundLodingImageView.image = UIImage(named: "RecordingSignal5.png")
         }else if(lowPassResults>=0.4){
             soundLodingImageView.image = UIImage(named: "RecordingSignal4.png")
         }else if(lowPassResults>=0.3){
             soundLodingImageView.image = UIImage(named: "RecordingSignal3.png")
         }else if(lowPassResults>=0.2){
             soundLodingImageView.image = UIImage(named: "RecordingSignal2.png")
         }else if(lowPassResults>=0.1){
             soundLodingImageView.image = UIImage(named: "RecordingSignal1.png")
         }else{
             soundLodingImageView.image = UIImage(named: "RecordingSignal1.png")
         }

     }

实现：

         titleLabel.text = titleString

         let mp3Path = NSBundle.mainBundle().pathForResource("xiaoPingGuo", ofType: "mp3")
         let fileUrl = NSURL.fileURLWithPath(mp3Path!)

         audioPlayer = AVAudioPlayer(contentsOfURL: fileUrl, error: nil)
         audioPlayer.prepareToPlay()

         //以下录音使用

         //初始化录音器
         let session:AVAudioSession = AVAudioSession.sharedInstance()

         //初始化一个NSError对象，失败的时候可以获取失败原因
         var error:NSError?

         //设置录音类型
         session.setCategory(AVAudioSessionCategoryPlayAndRecord, error: &error)

         //设置支持后台
         session.setActive(true, error: &error)

         //获取Document目录
 //        let docDir = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as String

         //2015年5月2后修改
         let docDir = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, ] as! String

         //组合录音文件路径
         aacPath = docDir + "/play.aac"

         //初始化字典
         recorderSettingsDic = Dictionary()

         //字典添加设置参数
         recorderSettingsDic!.updateValue(NSNumber(long: kAudioFormatMPEG4AAC), forKey: AVFormatIDKey)
         recorderSettingsDic!.updateValue(NSNumber(), forKey: AVSampleRateKey)
         recorderSettingsDic!.updateValue(NSNumber(), forKey: AVNumberOfChannelsKey)
         recorderSettingsDic!.updateValue(NSNumber(), forKey: AVLinearPCMBitDepthKey)
         recorderSettingsDic!.updateValue(NSNumber(bool: false), forKey: AVLinearPCMIsBigEndianKey)
         recorderSettingsDic!.updateValue(NSNumber(bool: false), forKey: AVLinearPCMIsFloatKey)