在后台录制语音使用AVAudioRecorder [英] Recording voice in background using AVAudioRecorder

问题描述

我试图使用记录在后台用户语音 AVAudioRecorder 但每次我得到的时间 NO 同时呼吁 recordForDuration 方法。我想补充声音来 UIBackgroundModes 但这没有帮助。
顺便说一句，一切工作在前台完美。我初始化 AVAudioRecorder 使用此code：

I'm trying to record user voice in background using AVAudioRecorder but every time i get NO while calling recordForDuration method. I add "audio" to UIBackgroundModes but this don't help. By the way, Everything works perfect in foreground. I'm initializing AVAudioRecorder using this code:

NSError* error;
if (![[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryRecord error:&error])
{
    NSLog(@"Error while setting audio session category. Code - %d, description - \"%@\".", [error code], [error localizedDescription]);
    return;
}

NSURL* outputFileURL = [VKMFileSystemHelper uniqueFileInPath:[[VKMFileSystemHelper subdirectoryInsideLibrary:DIR_AUDIO] path] withExtension:@"m4a"];

NSDictionary* recordSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                                    [NSNumber numberWithInt:kAudioFormatMPEG4AAC], AVFormatIDKey,
                                    [NSNumber numberWithInt:AVAudioQualityMin]   , AVEncoderAudioQualityKey,
                                    [NSNumber numberWithInt:16]                  , AVEncoderBitRateKey,
                                    [NSNumber numberWithInt:1]                   , AVNumberOfChannelsKey,
                                    [NSNumber numberWithFloat:12000.0]           , AVSampleRateKey,
                                    nil];

_recorder = [[AVAudioRecorder alloc] initWithURL:outputFileURL settings:recordSettings error:&error];
[_recorder setDelegate:self];

if (error)
{
    NSLog(@"Error occured during audio recorder initialization. Error code - %d, description - \"%@\".", [error code], [error localizedDescription]);
}
else
{
    NSLog(@"Start recording.");
    if ([_recorder recordForDuration:[shedule execLength]])
    {
        NSLog(@"Record started.");
    }
    else
    {
        NSLog(@"Record failed.");
    }            
}

我如何能记录从麦克风的背景是什么？这可能吗？

How can i record from microphone from background ? Is this possible?

推荐答案

试试这个，

        ***Appdelegate.m***

- (void)applicationDidEnterBackground:(UIApplication *)application
{
__block UIBackgroundTaskIdentifier task = 0;
task=[application beginBackgroundTaskWithExpirationHandler:^{
    NSLog(@"Expiration handler called %f",[application backgroundTimeRemaining]);
    [application endBackgroundTask:task];
    task=UIBackgroundTaskInvalid;
}];

}

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