IOS 解析歌词lrc

最近在捣鼓音乐播放器，过程中学到了一些东西，写下来分享一下，首先是歌词的解析

首先我们看看lrc（不贴维基了怕打不开

歌词文件一般是这样的格式

1.[分钟:秒.毫秒] 歌词

2. [分钟:秒] 歌词

3. [分钟:秒:毫秒] 歌词

其中1是标准格式，下面我就一种为例。

思路是先获取整个歌词内容，再按换行分段，对每一行中的内容，分为两部分，时间和内容，分别提取。

     -(void)parselyric
   {
      NSString *path = [[NSBundle mainBundle]pathForResource:_lab_title.text ofType:@"lrc"];

      //if lyric file exits
      if ([path length]) {

        //get the lyric string
        NSString *lyc = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];

        //init
        _musictime = [[NSMutableArray alloc]init];
        _lyrics = [[NSMutableArray alloc]init];
        _t = [[NSMutableArray alloc]init];

        NSArray *arr = [lyc componentsSeparatedByString:@"\n"];

        for (NSString *item in arr) {

            //if item is not empty
            if ([item length]) {

                NSRange startrange = [item rangeOfString:@"["];
                NSLog(@"%d%d",startrange.length,startrange.location);
                NSRange stoprange = [item rangeOfString:@"]"];

                NSString *content = [item substringWithRange:NSMakeRange(startrange.location+1, stoprange.location-startrange.location-1)];

                NSLog(@"%d",[item length]);

                //the music time format is mm.ss.xx such as 00:03.84
                if ([content length] == 8) {
                    NSString *minute = [content substringWithRange:NSMakeRange(0, 2)];
                    NSString *second = [content substringWithRange:NSMakeRange(3, 2)];
                    NSString *mm = [content substringWithRange:NSMakeRange(6, 2)];

                    NSString *time = [NSString stringWithFormat:@"%@:%@.%@",minute,second,mm];
                    NSNumber *total =[NSNumber numberWithInteger:[minute integerValue] * 60 + [second integerValue]];
                    [_t addObject:total];

                    NSString *lyric = [item substringFromIndex:10];

                    [_musictime addObject:time];
                    [_lyrics addObject:lyric];
                }
            }
        }
    }
    else
        _lyrics = nil;
  }

这里我只处理里标准格式的歌词，其它格式也可用类似方法处理。