我想做一个匀光（乘法）表...并希望从TexteditingController中获取用户的输入，但我无法从文本编辑控制器中获取整数值。期待是否有人会调查它，

TextEditingController num = TextEditingController();
  void table() {
    print('enter the number $num');

    for (var i = 1; i <= 10; i++) {
      print('$num*$i = ${num * i}'); //<error>(The operator '*' isn't defined for the type,,'')
    }
  }
    
  Scaffold(
    body: Column(
      children: [
        TextFormField(
          controller: TextEditingController(),
        ),
        Container(
          height: 400,
          width: 400,
          decoration: BoxDecoration(
            color: Colors.black,
            borderRadius: BorderRadius.circular(20),
          ),
          child: ElevatedButton(
            onPressed: table, 
            child: Text('')),
          ),
        ],
      ));
    }
  }