小编use*_*240的帖子

我已经尝试克服了一段时间。我正在尝试录制声音，但 AVAudioRecorder 在屏幕锁定时不会录制。一旦屏幕解锁，它确实会继续录制，但屏幕锁定时录制的音频将永远丢失。我在做的事情中找不到任何问题：

-(void) startRecording
{
    // Begin the recording session.
    _session = [AVAudioSession sharedInstance];
    NSError *setCategoryError = nil;

    NSError *startRecordError;
    [_session setActive:YES error:&startRecordError];
    [self GKLog:[NSString stringWithFormat:@"recorder session error? :%@", startRecordError]];

    [_session  setCategory: AVAudioSessionCategoryRecord  error: &setCategoryError];

    if (setCategoryError) { NSLog(@"some error");}

    //set me as delegate    
    _session.delegate=(id <AVAudioSessionDelegate>) self;

    NSMutableDictionary* recordSetting = [[NSMutableDictionary alloc] init];
    [recordSetting setValue :[NSNumber numberWithInt:kAudioFormatAppleIMA4] forKey:AVFormatIDKey];
    [recordSetting setValue :[NSNumber numberWithInt:8]                               forKey:AVEncoderBitRateKey];
    [recordSetting setValue:[NSNumber numberWithFloat:8000.0] forKey:AVSampleRateKey]; 
    [recordSetting setValue:[NSNumber numberWithInt: 1] forKey:AVNumberOfChannelsKey];

    if (!self.currentPath)
    {
        NSLog(@"can't record, no path …