Objective-C录制，暂停录制，播放暂停录制，继续录制

Question

我正在尝试制作一个表现如下的录音机

1. 录制语音
2. 暂停声音
3. 收听录音
4. 继续录制

我试过这样做：

  

初始化记录器

NSString *cacheDir = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
NSString *dataPath = [cacheDir stringByAppendingPathComponent:@"/AudioFiles"];
if (![[NSFileManager defaultManager] fileExistsAtPath:dataPath])
{
    NSError *error=nil;
    [[NSFileManager defaultManager] createDirectoryAtPath:dataPath withIntermediateDirectories:NO attributes:nil error:&error];
}
NSArray *pathComponents = [NSArray arrayWithObjects:
                           dataPath,
                           [NSString stringWithFormat:@"%@.m4a",self.FileName],
                           nil];
NSURL *outputFileURL = [NSURL fileURLWithPathComponents:pathComponents];

// Setup audio session
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
// Define the recorder setting
NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc] init];

[recordSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];
[recordSetting setValue:[NSNumber numberWithFloat:22050.0] forKey:AVSampleRateKey];
[recordSetting setValue:[NSNumber numberWithFloat:32000.0] forKey:AVEncoderBitRateKey];
[recordSetting setValue:[NSNumber numberWithInt: 1] forKey:AVNumberOfChannelsKey];
[recordSetting setValue:AVAudioBitRateStrategy_Variable forKey:AVEncoderBitRateStrategyKey];
// Initiate and prepare the recorder
recorder = [[AVAudioRecorder alloc] initWithURL:outputFileURL settings:recordSetting error:NULL];
recorder.delegate = self;
recorder.meteringEnabled = YES;
[recorder prepareToRecord];

  

记录

[recorder record];

  

暂停记录

[recorder pause];

  

播放记录

playingSession = [AVAudioSession sharedInstance];
[playingSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
[playingSession setActive: YES error:nil];
NSError *error = nil;
player = [[AVAudioPlayer alloc] initWithContentsOfURL:recorder.url error:&error];
NSLog(@"Error initializing player: %@", error);
[player setDelegate:self];
[player play];

所以我收到以下错误

  

错误域= NSOSStatusErrorDomain代码= 1685348671＆＃34;（null）＆＃34;

我知道如何才能使这项工作？