记录时记录时间

Question

我有一个AVAudioRecorder记录声音。我也有一个标签。我想每秒钟更新标签上的文字以显示录制时间。我怎样才能做到这一点？

Answer 1

您可以使用AVAudioRecorder（audioRecorder.currentTime）的currentTime属性来获取从您可以用于在标签上显示的记录开始的NSTimeInterval开始的时间。

Answer 2

这样做：

- (IBAction)startStopRecording:(id)sender 
    { 
      //If the app is note recording, we want to start recording, and make the record button say "STOP" 
     if(!self.isRecording) 
     { 
      self.isRecording = YES; //this is the bool value to store that recorder recording 
      [self.recordButton setTitle:@"STOP" forState:UIControlStateNormal]; 

      recorder = [[AVAudioRecorder alloc] initWithURL:recordedFile settings:nil error:nil]; 
      [recorder prepareToRecord]; 
      [recorder record]; 

      myTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(updateSlider) userInfo:nil repeats:YES]; //this is nstimer to initiate update method 
     } 

     else 
     { 
      self.isRecording = NO; 
      [self.recordButton setTitle:@"REC" forState:UIControlStateNormal]; 

      [recorder stop]; 
      recorder = nil;  
      [myTimer invalidate]; 
     } 

    } 

- (void)updateSlider { 
    // Update the slider about the music time 
    if([recorder isRecording]) 
    { 

     float minutes = floor(recorder.currentTime/60); 
     float seconds = recorder.currentTime - (minutes * 60); 

     NSString *time = [[NSString alloc] 
            initWithFormat:@"%0.0f.%0.0f", 
            minutes, seconds]; 
     recordTimeLabel.text = time; 
    } 
}