OC中字典数组嵌套使用

一、字典中套数组

1. 通讯录（根据名字首字母分组，打印联系人信息）

 NSMutableDictionary *contactDic=[NSMutableDictionary dictionary];
    for (char c = 'A';c <= 'Z'; c++) {
        NSString *key = [NSString stringWithFormat:@"%c",c];
        NSMutableArray *contactArray = [NSMutableArray array];
        [contactDic setObject:contactArray forKey:key];
       //效果与上句话相同
        
    }
    Contact *contact=[[Contact alloc] initWithName:@"张宇" phoneNumber:@"150123477889" group:@"Z"];
    //判断姓名和电话号是否为空
    if (contact.name != nil && contact.name.length != 0 && contact.phoneNumber != nil&& contact.phoneNumber.length != 0) {
        
        NSMutableArray *contactArray = [contactDic objectForKey:contact.group];
        [contactArray addObject:contact];
        
    }else{
        NSLog(@"姓名或电话号不能为空");
    }
    NSArray *keyArray = contactDic.allKeys;
    for (int i = 0; i < keyArray.count; i++) {
        NSString *key = keyArray[i];
        NSMutableArray *contactArray = [contactDic objectForKey:key];
        for (int j = 0; j < contactArray.count; j++) {
            Contact *contact = contactArray[j];
            [contact showInfo];
        }
    }

二.综合应用实例（各个省市列表）

    NSMutableArray *provinceArray = [NSMutableArray array];
  //加载文件得到相关数据
    NSString *contentStr = [NSString stringWithContentsOfFile:@"/Users/lanou3g/Downloads/area.txt" encoding:NSUTF8StringEncoding error:nil];
//将数据以/n分割成一行一行的数据装进数组
    NSArray *lineArray = [contentStr componentsSeparatedByString:@"/n" ];
//遍历数组，判断他是省名、城市名还是区名并执行相关的操作
    for (NSString *lineString in lineArray) {
        if (![lineString hasPrefix:@" "]) {
          //省名就创建省字典，并为其添加相应键值对装进省数组中
            NSMutableDictionary *provinceDic = [NSMutableDictionary dictionary];
          //provinceName：城市名   cityArray：城市字典
            [provinceDic setObject:lineString forKey:@"provinceName"];
            NSMutableArray *cityArray = [NSMutableArray array];
            [provinceDic setObject:cityArray forKey:@"cityArray"];
          //添加到城市字典
            [provinceArray addObject:provinceDic];
            
        }else if(![lineString hasPrefix:@"    "]){
           //城市名就获取该城市对应的省字典，创建城市字典，添加相应键值对最后将其装进城市数组中
            NSMutableDictionary *provinceDic = [provinceArray lastObject];
            NSMutableArray *cityArray = [provinceDic objectForKey:@"cityArray"];
            NSMutableDictionary *cityDic = [NSMutableDictionary dictionary];
            [cityDic setObject:lineString forKey:@"cityName"];
            NSMutableArray *areaArray = [NSMutableArray array];
            [cityDic setObject:areaArray forKey:@"areaArray"];
            [cityArray addObject:cityDic];
            
        }else{
          //获取区对应的省字典
            NSMutableDictionary *provinceDic = [provinceArray lastObject];
         //获取区对应的城市数组
            NSMutableArray *cityArray = [provinceDic objectForKey:@"cityrray"];
           //取出区对应的城市字典
            NSMutableDictionary *cityDic = [cityArray lastObject];
          //取出存放地区的地区数组
             NSMutableArray *areaArray=[cityDic objectForKey:@"areaArray"]；
         //将地区名添加到数组中
            [areaArray addObject:lineString];
        }
    }
//遍历取出数据打印在控制台
    for (NSMutableDictionary *provinceDic in provinceArray) {
        NSLog(@"%@",[provinceDic objectForKey:@"provinceName"]);
        for (NSMutableDictionary *cityDic in [provinceDic objectForKey:@"cityArray"]) {
            NSLog(@"%@",[cityDic objectForKey:@"cityName"]);
            for (NSString *areaName in [cityDic objectForKey:@"areaArray"]) {
                NSLog(@"%@",areaName);
            }
        }
        
    }