如何在 Dart 的 Map 中添加动态值？

Question

我有一个动态 UI，可能是下拉菜单或文本字段！

我需要准备地图发送到后端。下面是我需要从动态 UI,

准备的地图格式

Map temp;

  temp = {
    "receiver": {
      "Bank": {"accounnt": '123'},
    }
  };
  if(temp['receiver']['school'] == null){
    temp['receiver']['school'] = '12';
  }

但是当我尝试添加 temp['receiver']['school'] = '12'; 时出现错误。错误指出，type 'String' is not a subtype of type 'Map<String, String>' of 'value.'

我想创建以下格式的地图，

  "receiver": {
    "bank_account": {
      "swift_bic": "XXX",
      "account_number": "225225"
    },
    "reason_for_sending": "Family"
  }
 


 Error image: https://i.stack.imgur.com/5yg2t.png

Answer 1

试试这个：

void main() {
 Map<String,Map<String,dynamic>> temp;

  temp = {
    "receiver": {
      "Bank": {"accounnt": '123'}
    }
  };
  if(temp['receiver']!['school'] == null){
    temp['receiver']!['school'] = '12';
  }
  print(temp);
}

如何在 Dart 的 Map 中添加动态值？

How to add dynamic value in Map in Dart?

collections

android

ios

dart

flutter