iOS --- 字符串用法

把字符串中的和字典中的字符串的ID相对应，之后以|区分，存入字符串

    //车长
    NSArray *strArr = [self.conductorLbl.text componentsSeparatedByString:@" "];// 以空格分割成数组，依次读取数组中的元素
    NSMutableArray * arrayKey = [[NSMutableArray alloc]init];
    for (NSString * str in strArr) {
        NSArray *keys = [self.conductorDic allKeys];
        NSString *theKey = nil;
        for(NSString *key in keys){
            NSString *value = self.conductorDic[key];
            if([value isEqualToString:str]){
                theKey = key;
                [arrayKey addObject:theKey];
                break;//好了，现在你得到你的key了。
            }
        }
    }
    NSString *cheC1 = @"";
    for(NSString *str22 in arrayKey){
        cheC1 = [cheC1 stringByAppendingFormat:@"%@|",str22];
    }//车长cheC
    NSString *cheC = [cheC1 substringToIndex:[cheC1 length] - 1];