Question

我第一次使用flutter和stackoverflow，请原谅我错误。我在global.dart文件中有全局变量。在我的主目录中，我想通过传递值来访问和编辑变量

Global.dart
String nome_impianto1 = "IMPIANTO 1";
String nome_impianto2 = "IMPIANTO 2";
String nome_impianto3 = "IMPIANTO 3";
String nome_impianto4 = "IMPIANTO 4";

main.dart
import 'package:services/global.dart' as globals;
globals.nome_impianto1 = usrcontroller_ovrelay_impianto.text;  //so it works.

如何传递要更改的值？

globals.nome_impianto{$'1'} = usrcontroller_ovrelay_impianto.text //I know it doesn't work, and just to get the idea;

感谢所有人最好的祝福安德里亚

Answer 1

将此添加到您的任何功能中

 setState((){
      globals.nome_impianto1 = usrcontroller_ovrelay_impianto.text;
    });

Answer 2

避免在flutter中使用全局变量。如果您要全局管理状态，请使用StatefulWidget，甚至最好开始使用provider或更高级的bloc。
对于您的问题，如果要全局访问它们，最好使用Map

//  Global.dart
  Map<String, String> globals = {
    "nome_impianto1": "IMPIANTO 1",
    "nome_impianto2": "IMPIANTO 2",
    "nome_impianto3": "IMPIANTO 3",
    "nome_impianto4": "IMPIANTO 4",
  };

// main.dart
  int index = 1;
  globals["nome_impianto$index"] = usrcontroller_ovrelay_impianto.text;

颤振没有反射https://stackoverflow.com/a/49871692/8608146

Flutter将值传递给全局变量

2 个答案: