flutter - 我想全局定义一个变量，但它应该在本地初始化，并且其他类的数据应该相同

Question

bool Globalveriable = false;

    class Class1 extends StatefulWidget {
      @override
      _Class1State createState() => _Class1State();
    }
    
    class _Class1State extends State<Class1> {
      @override
      Widget build(BuildContext context) {
        return DayNightSwitch(
          value: Globalveriable,
          onChanged: (changed) {
            setState(() {
              Globalveriable = changed;
            });
          },
        );
      }
    }
    
    class Class2 extends StatefulWidget {
      @override
      _Class2State createState() => _Class2State();
    }
    
    class _Class2State extends State<Class2> {
      @override
      Widget build(BuildContext context) {
        return Text(Globalveriable.toString());
      }
    }

//单击开关时，Globalveriable 的值对于 Class1 将是 true，但我希望它在同一时间对于 Class2 应该是相同的

Answer 1

添加static关键字将解决您的问题

static bool Globalveriable = false;