看起来像是苹果API的一个bug。很有趣...
这是我们收到的支持票的响应。
“您描述的行为是一个错误，不幸的是，API中没有任何东西可以更改以解决实际附加到原始记录的问题。中断导致仅捕获中断后记录的音频。您可以尝试在中断后停止录制，然后创建一个新文件，之后至少不会导致用户丢失任何信息，但结果将是两个单独的文件。
请针对此问题提交错误报告，因为当iOS工程师评估要解决的修复程序的关键功能时，外部开发人员提交的错误至关重要。它很容易复制，但如果你有一个测试应用程序，你可以包括请做，iOS工程喜欢有应用程序，直接显示错误。”

我的解决方案是：
1.在临时文件上开始记录
1.注意AVAudioSessionInterruptionNotificatio
1.在AVAudioSessionInterruptionTypeBegan上-停止录制。

1. On AVAudioSessionInterruptionTypeEnded -开始新录制。
   1.当用户停止时-标记文件。
   Full Code

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(audioSessionInterruptionNotification:)
                                             name:AVAudioSessionInterruptionNotification
                                           object:audioSession];


    -(void)audioSessionInterruptionNotification:(NSNotification*)notification {
    NSString* seccReason = @"";
    //Check the type of notification, especially if you are sending multiple AVAudioSession events here
    NSLog(@"Interruption notification name %@", notification.name);
    NSError *err = noErr;
    if ([notification.name isEqualToString:AVAudioSessionInterruptionNotification]) {
    seccReason = @"Interruption notification received";

    //Check to see if it was a Begin interruption
    if ([[notification.userInfo valueForKey:AVAudioSessionInterruptionTypeKey] isEqualToNumber:[NSNumber numberWithInt:AVAudioSessionInterruptionTypeBegan]]) {
        seccReason = @"Interruption began";
        NSLog(@"Interruption notification name %@ audio pause", notification.name);

        dispatch_time_t restartTime = dispatch_time(DISPATCH_TIME_NOW,
                                                    0.01 * NSEC_PER_SEC);
        dispatch_after(restartTime, dispatch_get_global_queue(0, 0), ^{
            AVAudioRecorder *recorder = [[self recorderPool] objectForKey:lastRecID];
            if (recorder) {
                if(recorder.isRecording) {
                    [recorder stop];
                    NSLog(@"Interruption notification name Pauseing recording %@", lastRecID);
                } else {
                    NSLog(@"Interruption notification name Already Paused %@", lastRecID);
                }
            }else {
                NSLog(@"Interruption notification name recording %@ not found", lastRecID);
            }
              NSLog(@"Interruption notification Pauseing recording status %d",recorder.isRecording);
        });

    } else if([[notification.userInfo valueForKey:AVAudioSessionInterruptionTypeKey] isEqualToNumber:[NSNumber numberWithInt:AVAudioSessionInterruptionTypeEnded]]){
        seccReason = @"Interruption ended!";
         NSLog(@"Interruption notification name %@ audio resume", notification.name);
        //Start New Recording
        dispatch_time_t restartTime = dispatch_time(DISPATCH_TIME_NOW,
                                                    0.1 * NSEC_PER_SEC);
        dispatch_after(restartTime, dispatch_get_global_queue(0, 0), ^{
            AVAudioRecorder *recorder = [[self recorderPool] objectForKey:lastRecID];
            NSLog(@"Interruption notification Resumeing recording status %d",recorder.isRecording);
            if (recorder) {
                if(!recorder.isRecording) {
                    NSString *filePath = [[self orgFileNames] objectForKey:lastRecID];
                    NSArray * fileNames =[[self fileNames] objectForKey:lastRecID];
                    NSString *tmpFileName = [self gnrTempFileName:filePath AndNumber:fileNames.count];
                    [[[self fileNames] objectForKey:lastRecID] addObject:tmpFileName];
                    NSURL *url = [NSURL fileURLWithPath:tmpFileName];
                    NSError *error = nil;
                    recorder = [[AVAudioRecorder alloc] initWithURL:url settings:recordSetting error:&error];
                    if (![recorder record]) {
                        NSLog(@"Interruption notification Error Resumeing recording %@",tempRecorder);
                        return;
                    }
                    [[self recorderPool] setObject:recorder forKey:lastRecID];
                    NSLog(@"Interruption notification nameResumeing recording %@",lastRecID);
                }else {
                     NSLog(@"Interruption notification Already Recording %d",recorder.isRecording);
                }
            }else {
                NSLog(@"Interruption notification name recording %@ not found",lastRecID);
            }
        });
      }
     } 
    }

实际上没有bug（至少现在没有了）。该方法的当前文档（2023）指出，调用.record()将隐式调用.prepareToRecord()，这将在指定的URL处创建一个NEW文件。苹果的文档明确指出，如果一个文件存在于URL，它将被覆盖。换句话说，使用所提供的API，“恢复”录制是不可能的。使用AVAudioRecorder实现此目的的唯一方法是创建多个文件并合并它们。应该注意的是，苹果的AVAudioRecorder.record()文档是误导性的，因为它实际上说“开始或恢复音频录制”。
https://developer.apple.com/documentation/avfaudio/avaudiorecorder/1388252-recordhttps://developer.apple.com/documentation/avfaudio/avaudiorecorder/1389435-preparetorecord

您将尝试使用这段代码

-(IBAction)pauseandplay:(id)sender
{
    BOOL status= [player isPlaying];
    if(status)
    {
    [pauseplay setImage:[UIImage imageNamed:@"play.png"]];
    [player pause];
    }
    else
    {
    [pauseplay setImage:[UIImage imageNamed:@"icon-pause.png"]];
    [player play];
    updateTimer = [NSTimer scheduledTimerWithTimeInterval:.01 target:self selector:@selector(updateCurrentTime) userInfo:player repeats:YES];
    }
}