解析歌词

Posted 2020-08-10 有棱角的圆

 

1.获取歌词文件

//获取歌词文件
-(void)analysisIrc{
    _timeArr=[[NSMutableArray alloc]init];
    _stringArr=[[NSMutableArray alloc]init];
 
    NSDictionary *dic=[self.playlistArr objectAtIndex:self.currentNum];
    NSDictionary *songInfo=[dic valueForKey:@"songinfo"];
    NSString *lrcStr=[songInfo valueForKey:@"lrclink"];
    if ([NSData dataWithContentsOfFile:[self getLocalFilePath]]) {//本地存在
        NSLog(@"本地歌词");
        self.lrcLabel.text=self.nameLabel.text;
        [self ana];
    }else{//本地不存在
   [NSURLConnection sendAsynchronousRequest:[NSMutableURLRequest requestWithURL:[NSURL URLWithString:lrcStr]] queue:[NSOperationQueue new] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
       if (data) {
           [data writeToFile:[self getLocalFilePath] atomically:YES];
           NSLog(@"歌词准备完毕");
           [self performSelectorOnMainThread:@selector(ana) withObject:nil waitUntilDone:YES];
       }
      
   }];
    }
}

2.解析歌词文件

-(void)ana{
//获取歌词文件
    NSString *lyc = [NSString stringWithContentsOfFile:[self getLocalFilePath] encoding:NSUTF8StringEncoding error:nil];
    //   NSLog(@"歌词----%@",lyc);
//每行为一个元素
    NSArray *lycArray = [lyc componentsSeparatedByString:@"\n"];
    for (int i = 0; i < [lycArray count]; i++) {
        
        NSString *lineString = [lycArray objectAtIndex:i];
        
        NSArray *lineArray = [lineString componentsSeparatedByString:@"]"];
        //行不为空，长度大于时间长度
        if ([lineArray[0] length] > 8) {
            
            NSString *str1 = [lineString substringWithRange:NSMakeRange(3, 1)];
            
            NSString *str2 = [lineString substringWithRange:NSMakeRange(6, 1)];
            
            if ([str1 isEqualToString:@":"] && [str2 isEqualToString:@"."]) {
                
                for (int i = 0; i < lineArray.count - 1; i++) {
                    //获取歌词部分
                    NSString *lrcString = [lineArray objectAtIndex:lineArray.count - 1];
                    
                    //获取时间部分
                    NSString *timeString =[[lineArray objectAtIndex:i] substringWithRange:NSMakeRange(1, 5)];//
                    [_timeArr addObject:timeString];
                    [_stringArr addObject:lrcString];
                }
            }
        }
    }
}

3.获取歌词文件路径的函数

///*
//获取文件路径
//*/
-(NSString *)getLocalFilePath{

    NSArray *arr=NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
    NSString *path=[arr objectAtIndex:0];
  //  NSString *filepath=[path stringByAppendingPathComponent:_selectedPlaylistCellModel.playUrl32];
    NSDictionary *dic=[self.playlistArr objectAtIndex:self.currentNum];
    NSDictionary *songInfo=[dic valueForKey:@"songinfo"];
     NSString *filepath=[NSString stringWithFormat:@"%@/%@-%@.lrc",path,[songInfo valueForKey:@"author"],[songInfo valueForKey:@"title"]];
    NSLog(@"%@",filepath);
    return filepath;
}

4.展示歌词

 if (self.timeArr) {
            //NSLog(@"歌词存在");
            
            //NSLog(@"%@",lrcString);
            if ([self.timeArr containsObject:self.currentTimeLabel.text]) {
              //  NSLog(@"更新");
                int index=(int)[self.timeArr indexOfObject:self.currentTimeLabel.text];
                //内容不为空时传值
                if (![[self.stringArr objectAtIndex:index] isEqual:@""]) {
                    NSLog(@"%@",[self.stringArr objectAtIndex:index]);
                    self.lrcLabel.text=[self.stringArr objectAtIndex:index];
                }
            }
        }