对于省市区的问题，关键在于搞清楚数组嵌套字典，字典里面装数组的多重嵌套关系，沉下心来，捋清楚思路，
实在看不懂就多打几遍，这道题理解了，熟练了对之后学习很有好处。
代码如下：
NSString *path = @"/Users/lan/Desktop/省市区/省市区/area.txt"; ／／导入省市区文本的路径
NSString *pathStr = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil]; ／／通过UTF8转码，将省市区装入到字符串中
NSArray *array = [pathStr componentsSeparatedByString:@"\n"]; ／／根据回车符号“\n”,将字符串切割成数组
NSMutableArray *arrayProvince = [NSMutableArray arrayWithCapacity:0]; ／／创建初始化一个可变数组
for (NSString *str in array) { //遍历数组
if (![str hasPrefix:@" "]) { //判断非空格字符,找出省(由于省的名字前没有空格)
//每找到一个省的名字,创建一个字典
NSMutableDictionary *proDic = [NSMutableDictionary dictionaryWithCapacity:0];
//将省的名字放入字典当中,并设置key为ProName
[proDic setObject:str forKey:@"ProName"];
//创建市的数组,存放市区的字典
NSMutableArray *cityArray = [NSMutableArray arrayWithCapacity:0];
//将数组存入省的字典中
[proDic setObject:cityArray forKey:@"cityArray"];
//将省字典放入省的字典中
[arrayProvince addObject:proDic];
}
//找到市的名字
else if ([str hasPrefix:@" "] && ![str hasPrefix:@" "]){
//找到隶属的省的字典
NSDictionary *proDic = [arrayProvince lastObject];
//将省字典中预留的市的数组找出来
NSMutableArray *cityarr = [proDic objectForKey:@"cityArray"];
//创建市的字典
NSMutableDictionary *cityDic = [NSMutableDictionary dictionaryWithCapacity:0];
//把市的名字写入到市的字典中
[cityDic setObject:str forKey:@"cityName"];
//创建区的数组,用来存放找到的区的名字
NSMutableArray *zoneArray = [NSMutableArray arrayWithCapacity:0];
//把区的数组,放入到市的字典中
[cityDic setObject:zoneArray forKey:@"zoneArray"];
//把市的字典放入到市的数组中
[cityarr addObject:cityDic];
}
else{
//找到隶属的省的字典
NSDictionary *proDic = [arrayProvince lastObject];
//将省字典中预留的市的数组找出来
NSMutableArray *cityarr = [proDic objectForKey:@"cityArray"];
//将市数组中的市的字典找到
NSDictionary *citDic = [cityarr lastObject];
//将市字典中的区的数组找到
NSMutableArray *zoneArray = [citDic objectForKey:@"zoneArray"];
[zoneArray addObject:str];
}
for (NSMutableDictionary *dic1 in arrayProvince) { //遍历打印
NSLog(@"%@",[dic1 objectForKey:@"ProName"]);
for (NSMutableDictionary *dic2 in [dic1 objectForKey:@"cityArray"]) {
NSLog(@"%@",[dic2 objectForKey:@"cityName"]);
for (NSString *str in [dic2 objectForKey:@"zoneArray"]) {
NSLog(@"%@",str);
}
}
}