Play music when I select UITableViewCell

I can show music library on UITableView.

  songsArray = [[NSMutableArray alloc]init];
MPMediaQuery *playlistQuery = [[MPMediaQuery alloc开发者_StackOverflow]init];
[playlistQuery setGroupingType:MPMediaGroupingTitle];
songArray = [playlistQuery items];
for (MPMediaItem *song in songArray) {
    NSString *songTitle = [song valueForProperty: MPMediaItemPropertyTitle];        
    [songsArray addObject:songTitle];
}
  - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:                (NSIndexPath *)indexPath {
    cell.textLabel.text = [songsArray objectAtIndex:row];
[cell.textLabel setTextColor:[UIColor whiteColor]];

But I can't play music when I selected UITableView Cell.

    NSUInteger row = indexPath.row;

NSString *selectedSong = [songsArray objectAtIndex:row];
MPMusicPlayerController *appPlayer = [MPMusicPlayerController iPodMusicPlayer];

[appPlayer setQueueWithQuery:selectedSong];

[appPlayer play];

}

Ah I see the problem:

Move this code:

NSUInteger row = indexPath.row;
NSString *selectedSong = [songsArray objectAtIndex:row];
MPMusicPlayerController *appPlayer = [MPMusicPlayerController iPodMusicPlayer];
[appPlayer setQueueWithQuery:selectedSong];
[appPlayer play];

to the UITableViewDelegate protocol method 'didSelectRowAtIndexPath' like this:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSUInteger row = indexPath.row;
    NSString *selectedSong = [songsArray objectAtIndex:row];
    MPMusicPlayerController *appPlayer = [MPMusicPlayerController iPodMusicPlayer];
    [appPlayer setQueueWithQuery:selectedSong];
    [appPlayer play];
}

Edit

Documentation:

• UITableView Class Reference
• UITableViewDelegate Protocol Reference
• UITableViewDataSource Protocol Reference
• MPMusicPlayerController Class Reference
• MPMediaQuery Class Reference
• Using the iPod Library / iPod Library Access Programming Guide