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。