#import <Foundation/Foundation.h>
int main(int argc, const char * argv[]) {
    
    NSMutableArray *provinceArray = [NSMutableArray array];
    //NSError *error =nil;
    // 加載文件字符串  1.文件路徑 2.編碼格式3.錯誤信息
    NSString *contentString = [NSString stringWithContentsOfFile:@"/Users/lanou3g/Desktop/area.txt" encoding:NSUTF8StringEncoding error:nil];
    //NSLog(@"%@",contentString);
    //以換行符分割字符串 得到每一行的字符串內容
    NSArray *lineArray = [contentString componentsSeparatedByString:@"\n"];
    for (NSString *lineString in lineArray) {
        //NSLog(@"line:%@",lineString);
        if (![lineString hasPrefix:@" "]) {
            // 沒有空格前綴為省名
            //創建一個省份字典
            NSMutableDictionary *provincrDic = [NSMutableDictionary dictionary];
            // 省份字典添加鍵值對（provinceName省份名）
            [provincrDic setObject:lineString forKey:@"provinceName"];
            //創建一個城市數組（后面存儲城市字典）
            NSMutableArray *cityArray = [NSMutableArray array];
            //添加鍵值對（cityArray：城市數組）
            [provincrDic setObject:cityArray forKey:@"cityArray"];
            //將省字典添加到省數組中
            [provinceArray addObject:provincrDic];
      
        }else if (![lineString hasPrefix:@"    "]){
            //前綴不空格且不是4個空格的話為城市名
            //當讀取到城市名的時候需要找到該城市所屬的省份（省份數組中最后一個元素就是當前城市所屬省份）
          NSMutableDictionary *provinceDic =[provinceArray lastObject];
        NSMutableArray *cityArray = [provinceDic objectForKey:@"cityArray"];
          //創建城市字典
            NSMutableDictionary *cityDic = [NSMutableDictionary dictionary];
            //添加鍵值對（cityName城市名）
            [cityDic setObject:lineString forKey:@"cityName"];
            //創建地區數組（后面用于存儲地區名稱）
            NSMutableArray *areaArray = [NSMutableArray array];
            //添加鍵值對（areaArray：地區數組）
            [cityDic setObject:areaArray forKey:@"areaArray"];
            //將城市字典存入對應的城市數組中
            [cityArray addObject:cityDic];
    
        }else{
            //前綴有空格且有4個空格為地區名
            //獲取當前所屬省份
            NSMutableDictionary *provinceDic = [provinceArray lastObject];
            //獲取該省份的城市數組
            NSMutableArray *cityArray = [provinceDic objectForKey:@"cityArray"];
            //從城市數組中獲取當前地區所屬城市
            NSMutableDictionary *cityDic = [cityArray lastObject];
            //獲取該城市的地區數組
            NSMutableArray *areaArray = [cityDic objectForKey:@"areaArray"];
            //將地區名存入該地區數組
            [areaArray addObject:lineString];
         
        }
    }
    //NSLog(@"%@",provinceArray);
    for (NSMutableDictionary *provinceDic in provinceArray) {
        NSLog(@"省份：%@",[provinceDic objectForKey:@"provinceName"]);
        for (NSMutableDictionary *cityDic in [provinceDic objectForKey:@"cityArray"]) {
            NSLog(@"城市：%@",[cityDic objectForKey:@"cityName"]);
            for (NSString *areaName in [cityDic objectForKey:@"areaArray"]) {
                NSLog(@"地區：%@",areaName);
            }
        }
    }

    return 0;
}

這是在OC中利用數組和字典的相互套用解析的，附一張思維圖。

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