从网络上下载省份城市名称并存入文件然后进行读取省份城市

//实现的功能是 从后台拿到城市的省份以及名称，然后保存在本地的沙盒中 在使用的时候再拿出来用。

步骤1

//向后台请求数据

//忽略缓存
[RequestTools postJSONWithUrl:G.YB_GetZoneList parameters:@{} success:^(id responseObject) {
NSError *error = nil;
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingAllowFragments error:&error];
if (error) {
NSLog(@"json error:%@",error);
} else {
if (![dic[@"code"] isEqualToString:@"GOOD"]) {
return;
}
if (![[dic objectForKey:@"content"] isKindOfClass:[NSNull class]]) {
//对数据进行解析
NSArray *provinces = [dic objectForKey:@"content"];
if (provinces.count > 0) {
//重要代码
[[AccountManager shareManager] cacheCitiesInfomation:provinces];
_locationArray = [[AccountManager shareManager] getCitiesInfomation];
}
}

}

} fail:^(id obj) {
NSLog(@"error:%@",obj);
}];

步骤二：将解析到到的数据存起来

///缓存地区信息
- (void)cacheCitiesInfomation:(NSArray *)provincesDic{
NSString *citiesPath = [self getPathWithFileName:@"cities.data"];
[provincesDic writeToFile:citiesPath atomically:YES];
}

- (NSString *)getPathWithFileName:(NSString *)fileName{
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
return [path stringByAppendingPathComponent:fileName];
}

步骤三：从文件中读取信息

///读取地区信息
- (NSArray *)getCitiesInfomation{
NSString *citiesPath = [self getPathWithFileName:@"cities.data"];
NSArray *provincesDic = [[NSArray alloc] initWithContentsOfFile:citiesPath];
if (provincesDic==nil || provincesDic.count==0) {
return nil;
}
NSMutableArray *provinces = [NSMutableArray array];
for (NSDictionary *proDic in provincesDic) {
FCZoneProvince *province = [[FCZoneProvince alloc] init];
province.provinceName = proDic[@"provinceName"];
//某一省下的所有市
NSArray *citiesDic = proDic[@"cities"];
NSMutableArray *cities = [NSMutableArray array];
for (NSDictionary *cityDic in citiesDic) {
FCZoneCity *city = [[FCZoneCity alloc] init];
city.cityName = cityDic[@"cityName"];
//某一城市下的所有区
NSArray *countriesDic = cityDic[@"counties"];
NSMutableArray *coutries = [NSMutableArray array];
for (NSDictionary *countryDic in countriesDic) {
FCZoneCountry *country = [[FCZoneCountry alloc] init];
country.countryName = countryDic[@"countyName"];
if ([country.countryName isEqualToString:@"市辖区"]) {
continue;
}
[coutries addObject:country];
}
city.countries = coutries;
[cities addObject:city];
}
province.cities = cities;
[provinces addObject:province];
}
return provinces;
}

这样就获得了 provinces and cities

在这里我只是提供一个这样的思路，有了思路估计很快就可以上手了吧。