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我想从谷歌驱动器流式传输音频文件，从谷歌驱动器 sdk 中我可以跟踪下载内容的唯一方法是[fetcher setReceivedDataBlock:^(NSData *dataReceivedSoFar)，所以我实现了类似的东西，但我不确定这是否是一个好的解决方案，所以我问来自你们的建议。

好的，由于我只能获取dataReceivedSoFar，我正在从中删除已经下载的数据，然后将新数据附加到保存的数据中，并AVAudioPlayer在数据长度大于 100 000 字节时开始播放。

请告诉我这是否是一个好的解决方案，如果您对此有一些建议。

代码：

GTMHTTPFetcher *fetcher =
        [[self driveService].fetcherService fetcherWithURLString:song.filePath];

    NSArray *myPathList = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
    NSString *cachesDir    = [myPathList  objectAtIndex:0];
    NSString *songPath = [[NSString alloc] initWithString: [cachesDir stringByAppendingPathComponent:[NSString stringWithFormat:@"Song.%@", [song.name pathExtension]]]];

    [fetcher setReceivedDataBlock:^(NSData *dataReceivedSoFar) {

        NSFileManager *filemgr;
        filemgr = [NSFileManager defaultManager];
        if (![filemgr fileExistsAtPath: songPath ] == YES)
            [filemgr createFileAtPath:songPath contents:nil attributes:nil];

        NSData *currentData = [NSData dataWithContentsOfFile:songPath];
        NSLog(@"LENGTH: %d", currentData.length);

        NSMutableData *mutableData = [NSMutableData dataWithData:dataReceivedSoFar];

        if (currentData.length > 0) {
            [mutableData replaceBytesInRange:NSMakeRange(0, [currentData length]) withBytes:NULL length:0];
        }


        NSFileHandle *handle = [NSFileHandle fileHandleForUpdatingAtPath:songPath];
        [handle seekToEndOfFile];
        [handle writeData:mutableData];
        //[handle synchronizeFile];
        [handle closeFile];

        if (!self.audioPlayer.playing && dataReceivedSoFar.length > 100000)
        {
            NSURL *URL = [NSURL fileURLWithPath:songPath];

            self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:URL error:nil];
            [self.audioPlayer play];
            NSLog(@"Audio player started playing");
        }
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