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尝试播放歌曲文件（通过 MPMediaPickerController 选择）时出现上述错误。在 iOS6 中运行良好，但在 iOS5 上出现错误。这是代码：

DLog(@"song: %@", self.customSongUrl); //always logs a valid url such as ipod-library://item/item.mp3?id=-1890948386979134309

    if (self.customSongUrl) {
        AVAudioSession *session = [AVAudioSession sharedInstance];
        [session setCategory:AVAudioSessionCategoryPlayback error:nil];

        double delayInSeconds = 1.0;
        dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
        dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
            NSError *error = nil;
            self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:self.customSongUrl error:&error];
            if (!self.audioPlayer)
            {
                NSLog(@"AVAudioPlayer could not be established: %@", error); //results in Error Domain=NSOSStatusErrorDomain Code=-43 "The operation couldn’t be completed. (OSStatus error -43.)"                    
            }
            [self.audioPlayer prepareToPlay];
            [self.audioPlayer setNumberOfLoops:-1];
            [self.audioPlayer play];
        });
    }

根据我所做的研究，错误 -43 表明该文件不存在。但是该文件是从带有 MPMediaPickerController 的 iTunes 库中选择的。再说一次，这个错误只发生在 iOS5 上。那么为什么iOS5会认为这首歌不存在呢？

作为参考，这就是我从媒体选择器获取歌曲网址的方式：

- (void)mediaPicker:(MPMediaPickerController *) mediaPicker didPickMediaItems:(MPMediaItemCollection *) collection
{
    MPMediaItem *item = [[collection items] objectAtIndex:0];
    self.customSongUrl = [item valueForProperty:MPMediaItemPropertyAssetURL];

    [self dismissViewControllerAnimated:YES completion:NULL];

}
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1 回答 1

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我有一个类似的问题，问题最终是我的 mp4 文件目标成员资格复选框未选中，一旦我检查它，文件播放完美。

于 2014-02-22T14:17:02.357 回答