android - 如何在抖动中更新屏幕

Question

我遇到了麻烦。
我想在之后更新屏幕

setState(() => {
   widgetScreenBuilder = screenWidgets[currentScreen]
});

在我的类别选择器中已被调用。我试图做到这一点，所以我有一个主屏幕，该屏幕具有用于类别选择器的功能，然后我希望将当前的屏幕/小部件作为一个功能。然后，只需更改功能，即可更改选择器下方的屏幕/小部件。更改功能后，我只是找不到一种刷新页面/主屏幕主体的方法(类别选择器下方的小工具)
我的主屏幕:

import 'package:flutter/material.dart';
import 'package:app/widgets/categorySelector.dart';
import 'package:app/data/appData.dart';

class MainScreen extends StatefulWidget {
    @override
    _MainScreen createState() => _MainScreen();
}

class _MainScreen extends State<MainScreen> {
  @override
  Widget build(BuildContext context) {
    
    return Scaffold(
      backgroundColor: Theme.of(context).primaryColorDark,
      appBar: AppBar(
        backgroundColor: Theme.of(context).primaryColorDark,
        elevation: 0.0,
        title: Center(
          child: Text(
            "Tournaments",
            style: TextStyle(
              fontWeight: FontWeight.bold,
              fontSize: 26.0,
              letterSpacing: 1.1
              )
          ),
        ),
      ),
      body: Column(
        children: <Widget>[
          CategorySelector(),
          widgetScreenBuilder
        ],
      ),
    );
  }
}

我的类别选择器:

import 'package:app/data/appData.dart';
import 'package:flutter/material.dart';

class CategorySelector extends StatefulWidget {
  @override
  _CategorySelectorState createState() => _CategorySelectorState();
}

class _CategorySelectorState extends State<CategorySelector> {
  final List<String> categories = ['All games', 'New game', "New player", "Top players"];
  @override
  Widget build(BuildContext context) {
    return Container(
      height: 75.0,
      color: Theme.of(context).primaryColorDark,
      child: ListView.builder(
        scrollDirection: Axis.horizontal,
        itemCount: categories.length,
        itemBuilder: (BuildContext context, int index) {
          return GestureDetector(
            onTap: () {
              if (currentScreen != index) {
                currentScreen = index;
                setState(() => {
                  widgetScreenBuilder = screenWidgets[currentScreen]
                });
              }
            }, 
              child: Center(
                child: Padding(
                padding: EdgeInsets.symmetric(horizontal: 20.0, vertical: 20.0),
                child: Text(
                  categories[index],
                  style: TextStyle(
                    fontSize: 24.0,
                    fontWeight: FontWeight.bold,
                    letterSpacing: 1.2,
                    color: index == currentScreen ? Colors.white : Colors.white50
                  )
                )
            ),
              ),
          );
        }

        )
    );
  }
}

widgetScreenBuilder，screenWidgets和currentScreen所在的appData.dart文件:

import 'package:app/widgets/allGames.dart';

int currentScreen = 0;
List screenWidgets = [AllGames(), NewGame()];
var widgetScreenBuilder = screenWidgets[currentScreen];

我是应用开发， throw 和 Dart 的新手，所以我们将不胜感激!
谢谢<3

Answer 1

我不明白你的问题很好
但是我认为你应该尝试didChangeDependencies
检查它:https://api.flutter.dev/flutter/widgets/State/didChangeDependencies.html