iphone - 无法将元数据分离到不同的字符串

Question

在另一组代码中检索的元数据正在屏幕上显示在同一字符串上，并用“ - ”分隔它们。如何将每组信息放到它们自己的行或字符串上？

    NSDictionary *currentlyPlayingTrackInfo;
    NSString *msg = albumInfo;
    NSString *newArtist;
    NSString *newSongName;

    NSRange range = [msg rangeOfString:@" - "];

    if (range.location != NSNotFound){
        newArtist = [msg substringToIndex:range.location];
        newSongName = [msg substringFromIndex:(range.location + range.length)];
    }

    if (newArtist != nil){
        currentlyPlayingTrackInfo = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:newArtist, newSongName, pmAlbumArt, nil] forKeys:[NSArray arrayWithObjects:MPMediaItemPropertyArtist, MPMediaItemPropertyTitle, MPMediaItemPropertyArtwork, nil]];
    }else{
        currentlyPlayingTrackInfo = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:msg, pmAlbumArt, nil] forKeys:[NSArray arrayWithObjects:MPMediaItemPropertyTitle, MPMediaItemPropertyArtwork, nil]];
    }
    [MPNowPlayingInfoCenter defaultCenter].nowPlayingInfo = currentlyPlayingTrackInfo;
  }
}

Answer 1

如果您想将 msg 保留为一个字符串，您可以将“-”替换为“\n”，这样会将其分成 3 行。

    NSString *s = @"Artist - Song - Album";
    NSString *newString = [s stringByReplacingOccurrencesOfString:@"-" withString:@"\n"];
    NSLog(@"%@",newString);