如何为flutter分配变量Navigator.pushcontext，variable;

编程问答 2022-10-28

问题描述

我试图给它分配一个字符串 字符串变量=“'/ branchHome'”; Navigator.push（上下文，变量）; 但这不适用于错误

self.move

我尝试这样做 Traceback (most recent call last): File "<console>",line 1,in <module> File "/home/.../lib/python3.8/site-packages/wagtail/core/models.py",line 1381,in move super().move(target,pos=pos) File "/home/.../lib/python3.8/site-packages/treebeard/mp_tree.py",line 1095,in move return MP_MoveHandler(self,target,pos).process() File "/home/.../lib/python3.8/site-packages/treebeard/mp_tree.py",line 472,in process if self.target.is_descendant_of(self.node): AttributeError: 'nonetype' object has no attribute 'is_descendant_of'

那也不起作用

如何在dart中为“路线名称”分配变量

编辑： main.dart @H_502_16@ 

 Error: The argument type 'String' can't be assigned to the parameter type 'Route<Object>'.

列表@H_502_16@ 

Navigator.push(context,variable as Route);

我尝试了什么

void main() {
  runApp(MaterialApp(
    initialRoute: '/',routes: {
      '/': (context) => Loading(),'/home': (context) => Home(),'/studentHome': (context) => studentHome(),'/getAllstudents': (context) => getAllStudent(),'/examHome': (context) => getAllBranch(),'/branchHome': (context) => branchHome(),'/subjectHome': (context) => subjectHome(),},));
}

和

List<Info> slides = [
  Info(
    1,name: 'Branches',desc: "branches info",url: "'/branchHome'",),Info(
    2,name: 'Exams',desc: "exam info",url: "'/examHome'",];

解决方法

Navigator.pushNamed<dynamic>(context,slides[index].url);

这就像一个魅力

,

尝试执行以下代码。

Navigator.of(context).pushNamed('/branchHome');

在 main.dart 文件中，您必须先提供路由字符串的引用。

例如

return new MaterialApp(
      title: "MyApp",home: new HomePage(),routes: <String,WidgetBuilder> {
        '/home': (BuildContext context) => new HomePage(),},
,

在您main.dar中添加以下行

void main() {
  runApp(MaterialApp(
    title: 'Named Routes Demo',initialRoute: '/',routes: {
      
      '/': (context) => FirstScreen(),'/second': (context) => SecondScreen(),'/third': (context) => thirdScreen(),));
}

在导航路线中

Navigator.pushNamed(context,'/second');
dartroutes