IOS中本機存放區和查看json資料

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1.代碼建立json檔案，並儲存到本地第一步.設定json檔案的儲存路徑NSString *filePath = [NSHomeDirectory() stringByAppendingString:@"/Documents/myJson.json"];   NSLog(@"%@",filePath); 第二步.準備儲存資料NSMutableArray *arr = [[NSMutableArray alloc]init]; //用來盛放資料的value   NSDictionary *dic = @{@"key1":@"value1",@"key2":@"value2",@"key3":@"value3",@"key4":@"value4"};NSDictionary *dic1 = @{@"key1":@"value1",@"key2":@"value2",@"key3":@"value3",@"key4":@"value4"};NSDictionary *dic2 = @{@"key1":@"value1",@"key2":@"value2",@"key3":@"value3",@"key4":@"value4"};   [arr addObjectsFromArray:@[dic,dic1,dic2]];      NSDictionary *json_dic = @{@"arr":arr};//key為arr value為arr數組的字典 第三步.封包資料NSData *json_data = [NSJSONSerialization dataWithJSONObject:json_dic options:NSJSONWritingPrettyPrinted error:nil];   第四步.寫入資料[json_data writeToFile:filePath atomically:YES]; 經過這四步，就在本地指定路徑filePath建立了一個json檔案。（根目錄是一個字典 key為arr value為arr數組的字典）  2.讀取本地json資料 NSString *filePath = [NSHomeDirectory() stringByAppendingString:@"/Documents/myJson.json"];//擷取json檔案儲存的路徑   NSData *data = [NSData dataWithContentsOfFile:filePath];//擷取指定路徑的data檔案   id json = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil]; //擷取到json檔案的跟資料（字典） NSArray *arr = [json objectForKey:@"arr”];//擷取指定key值的value，是一個數組   for (NSDictionary *dic in arr) {           NSLog(@"%@",[dic objectForKey:@"key1"]);//遍曆數組 }    

IOS中本機存放區和查看json資料