day07-01-歌词解析

Objective-c

//[海阔天空+歌词][1]
//密码：S51T
//[海阔天空：歌词][2]
//  main.m
//  day07-01-歌词解析
//
//  Created by Aaron on 15/7/9.
//  Copyright (c) 2015年 Aaron. All rights reserved.
//
#import <Foundation/Foundation.h>
#import "LrcManager.h"
int main(int argc, const char * argv[]) {
    @autoreleasepool {
        LrcManager *manager = [[LrcManager alloc] init];
        [manager readLrcFile:@"/Users/qianfeng/Desktop/海阔天空.txt"];
        NSLog(@"%@",[manager searchLrcForTime:@"00:00.08"]);
    }
    return 0;
}

#import <Foundation/Foundation.h>
@interface LrcManager : NSObject
{
    NSMutableArray *_timesArray;
    NSMutableDictionary *_timeAndLrcDic;
}
-(void)readLrcFile:(NSString *)path;
-(NSString *)searchLrcForTime:(NSString *)timeStr;
@end

#import "LrcManager.h"
@implementation LrcManager
-(instancetype)init
{
    if(self = [super init])
    {
        _timesArray = [NSMutableArray array];
        _timeAndLrcDic = [NSMutableDictionary dictionary];
    }
    return self;
}
-(void)readLrcFile:(NSString *)path
{
    NSString *str = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
    //NSLog(@"%@",str);
    //按行切割
    NSArray *lines = [str componentsSeparatedByString:@"\n"];
    //解析每一行
    [self pareAllLines:lines];
}
-(void)pareAllLines:(NSArray *)lines
{
    for(NSString *oneLine in lines)
    {
        NSArray *array = [oneLine componentsSeparatedByString:@"]"];
//        NSLog(@"---------");
        NSLog(@"%ld",array.count);
        NSLog(@"%@",array);
//        NSLog(@"---------");
        //[00:00.33    海阔天空
        //判断是否有歌词
        if(array.count > 1)
        {
            //求毫秒
            NSInteger mSecond = [self returnMSecond:[array[0] substringFromIndex:1]];
            //存储关系
            [_timeAndLrcDic setObject:array[1] forKey:@(mSecond)];
            [_timesArray addObject:@(mSecond)];
        }
    }
//    NSLog(@"%@",_timeAndLrcDic);
//    NSLog(@"%@",_timesArray);
}
// 00:00.33
-(NSInteger)returnMSecond:(NSString *)timeStr
{
    NSInteger minute = [[timeStr substringToIndex:2] integerValue];
    NSInteger second = [[timeStr substringWithRange:NSMakeRange(3, 2)] integerValue];
    NSInteger mSecond = [[timeStr substringFromIndex:6] integerValue];
    return (minute*60+second)*100+mSecond;
}
-(NSString *)searchLrcForTime:(NSString *)timeStr
{
    NSInteger mSecond = [self returnMSecond:timeStr];
    //查找数组里合适的时间点
    for(int i = 0 ; i < [_timesArray count]; i++)
    {
        NSNumber *time = _timesArray[i];
        if(mSecond < [time integerValue])
        {
            if(i == 0)
            {
                return nil;
            }
            else
            {
                NSString *lrc = [_timeAndLrcDic objectForKey:_timesArray[i-1]];
                return lrc;
            }
        }
        if(i == [_timesArray count]-1)
        {
            return nil;
        }
    }
    return nil;
}
@end

海阔天空：歌词