OC 运用Dictionary & Array 实现省市区分类

NSString *filePath = @"/Users/dlios/Downloads/area.txt";
    NSError *error = nil;
    NSString *buffer = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&error];
    if (error) {
        NSLog(@"error : %@", [error localizedDescription]);
        exit(1);
    }
    NSLog(@"%@", buffer);
    NSArray *dataArray = [buffer componentsSeparatedByString:@"
"];
    NSLog(@"%@", dataArray);
    NSMutableArray *provinces = [NSMutableArray array];
    for (NSString *s in dataArray) {
        // 找到 省
        if (![s hasPrefix:@" "]) {
            NSMutableArray *citys = [NSMutableArray array];
            NSDictionary *pDic = [NSDictionary dictionaryWithObjectsAndKeys:s, @"name", citys, @"cities", nil];
            [provinces addObject:pDic];
        }
        // 找到 城市
        if ([s hasPrefix:@"  "] && ![s hasPrefix:@"    "]) {
            NSMutableArray *areas = [NSMutableArray array];
            NSDictionary *cDic = [NSDictionary dictionaryWithObjectsAndKeys:s, @"name", areas, @"areas", nil];
            NSDictionary *pDic = [provinces lastObject];
            NSMutableArray *cities = [pDic objectForKey:@"cities"];
            [cities addObject:cDic];
        }
        // 找到 区
        if ([s hasPrefix:@"    "]) {
            NSDictionary *pDic = [provinces lastObject];
            NSArray *cities = [pDic objectForKey:@"cities"];
            NSDictionary *cDic = [cities lastObject];
            NSMutableArray *areas = [cDic objectForKey:@"areas"];
            
            [areas addObject:s];
        }
    }
    NSLog(@"%@", provinces);
    
    for (NSDictionary *pDic in provinces) {
        if ([[pDic objectForKey:@"name"] hasPrefix:@"山东"]) {
            NSArray *cities = [pDic objectForKey:@"cities"];
            for (NSDictionary *cDic in cities) {
                if ([[cDic objectForKey:@"name"] hasPrefix:@"  烟台"]) {
                    NSArray *areas = [cDic objectForKey:@"areas"];
                    for (NSString *areaName in areas) {
                        NSLog(@"%@", areaName);
                    }
                }
            }
        }
    }