OC_省市区字典

    NSString *path = @"/Users/lanou3g/Desktop/practice1/practice1/area.txt";
    NSString *str = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
    NSArray *arr = [str componentsSeparatedByString:@"\n"];
    NSMutableArray *proArr = [NSMutableArray array];
    for (NSString *str in arr) {
        if (![str hasPrefix:@" "]) {
            NSMutableDictionary *proDic = [NSMutableDictionary dictionary];
            NSMutableArray *cityArr = [NSMutableArray array];
            [proDic setObject:str forKey:@"proName"];
            [proDic setObject:cityArr forKey:@"cityArr"];
            [proArr addObject:proDic];
        } else if ([str hasPrefix:@" "] && ![str hasPrefix:@"    "])  {
            NSMutableDictionary *cityDic = [NSMutableDictionary dictionary];
            NSMutableArray *areaArr = [NSMutableArray array];
            NSMutableDictionary *proDic = [proArr lastObject];
            NSMutableArray *cityArr = proDic[@"cityArr"];
            [cityDic setObject:str forKey:@"cityName"];
            [cityDic setObject:areaArr forKey:@"areaArr"];
            [cityArr addObject:cityDic];
        } else {
            NSMutableDictionary *proDic = [proArr lastObject];
            NSMutableArray *cityArr = proDic[@"cityArr"];
            NSMutableDictionary *cityDic = [cityArr lastObject];
            NSMutableArray *areaArr= cityDic[@"areaArr"];
            [areaArr addObject:str];
        }
    }
    for (NSMutableDictionary *dic in proArr) {
        NSLog(@"%@", dic[@"proName"]);
        NSMutableArray *cityArr = dic[@"cityArr"];
        for (NSMutableDictionary *cityDic in cityArr) {
            NSLog(@"%@", cityDic[@"cityName"]);
            NSMutableArray *areaArr = cityDic[@"areaArr"];
            for (NSString *areaName in areaArr) {
                NSLog(@"%@", areaName);
            }
        }
    }