Question

我已经使用以下代码初始化了一个带有NSData的AVAudioPlayer对象，而NSData又包含了我主数据库中mp3的数据。

NSError *error;
NSString *filePathForBgAudio = [[NSBundle mainBundle] pathForResource:@"beebuzz10" ofType:@"mp3"];
NSData *bgAudioData = [NSData dataWithContentsOfFile:filePathForBgAudio];
bgAudioPlayer = [[AVAudioPlayer alloc] initWithData:bgAudioData error:&error];
bgAudioPlayer.delegate = self;

我在bgAudioPlayer文件中声明了.h。但是当我通过设置断点进行检查时，我发现在此行bgAudioPlayer = [[AVAudioPlayer alloc] initWithData:bgAudioData error:&error];之后，bgAudioPlayer仍然显示为nil。但是filePathForBgAudio和bgAudioData已正确初始化并且包含数据。只有bgAudioPlayer是nil。上面的代码有什么问题？如何纠正这个？

Answer 1

- (void)viewDidLoad
{
    [super viewDidLoad];


    NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle]
                                         pathForResource:@"bubble"
                                         ofType:@"mp3"]];

    NSError *error;
    _audioPlayer = [[AVAudioPlayer alloc]
                    initWithContentsOfURL:url
                    error:&error];
    if (error)
    {
        NSLog(@"Error in audioPlayer: %@",
              [error localizedDescription]);
    } else
    {
        _audioPlayer.delegate = self;
        [_audioPlayer prepareToPlay];

    }
}


- (IBAction)playsound:(id)sender
{

    [_audioPlayer play];

  }

Answer 2

    NSError *error;
    NSURL *filePathForBgAudio1 =[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"beebuzz10" ofType:@"mp3"]];
    //NSString *filePathForBgAudio = [[NSBundle mainBundle] pathForResource:@"beebuzz10" ofType:@"mp3"];
   // NSData *bgAudioData = [NSData dataWithContentsOfFile:filePathForBgAudio1];
   bgAudioPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:filePathForBgAudio1 error:&error];

AVAudioPlayer initWithData返回nil

2 个答案: