0

我正在编写一个音频播放器应用程序，使用 AVAudio Player 从 NSDocs Dir 播放 mp3，使用 ALAssetsLibrary 子类和 AVURLAsset 加载它们可以使用以下代码跳到最后一首曲目，尽管我不确定这是否是发送一个 AVURLAsset 播放而不是队列数组的正确方法。

我使用苹果示例项目 AVPlayerDemo 作为 ALAssetsLibrary 子类的基础

- (IBAction)nextButtonTapped:(id)sender {



NSArray *sourceitems = [[finalSources objectAtIndex:_selectedPath.section] items];


[sourceitems enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
    id next = nil;
     next = [next objectAtIndex:_selectedPath.row];
    if (idx + 1 < sourceitems.count) {
        next = [sourceitems objectAtIndex:idx + 1];
        AssetBrowserItem *item = next;
        AVURLAsset *asset = (AVURLAsset*)item.asset;
        [self setURL:asset.URL];
        NSLog(@"next %@", next);

      //here it continues to the last object and plays, 
     //but i just want to skip one track and play, then click again and move 
     //to the next one

    }

  }];
}

- (void)setURL:(NSURL*)URL
{
if (mURL != URL)
{
    mURL = [URL copy];

    /*
     Create an asset for inspection of a resource referenced by a given URL.
     Load the values for the asset keys "tracks", "playable".
     */
    AVURLAsset *asset = [AVURLAsset URLAssetWithURL:mURL options:nil];

    NSArray *requestedKeys = [NSArray arrayWithObjects:kTracksKey, kPlayableKey, nil];

    /* Tells the asset to load the values of any of the specified keys that are not already loaded. */
    [asset loadValuesAsynchronouslyForKeys:requestedKeys completionHandler:
     ^{
         dispatch_async( dispatch_get_main_queue(),
                        ^{
                            /* IMPORTANT: Must dispatch to main queue in order to operate on the AVPlayer and AVPlayerItem. */
                            [self prepareToPlayAsset:asset withKeys:requestedKeys];
                            [self syncLabels:mURL];
                        });
     }];
}

}

任何指针将不胜感激。

在此先感谢 Gav。

4

0 回答 0