Flutter中ElevatedButton的Navigator.push()无法跳转求助

问题描述 #

ElevatedButton中的Navigator.push()点击后无任何跳转反应，尝试用InkWell的onTap()实现跳转也无效，点击按钮后始终停留在首页。

相关代码 #

HomeCard组件代码 #

import 'package:flutter/material.dart';
import 'package:metroguia/constants/colors.dart';

import '../../selecao__linha/selecao_linhas.dart';

class HomeCard extends StatelessWidget {
  const HomeCard({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      width: 281,
      height: 111,
      decoration: BoxDecoration(
        color: orangeDetails.withOpacity(0.8),
        borderRadius: BorderRadius.circular(9),
        boxShadow: [
          BoxShadow(
              color: Colors.black.withOpacity(0.1),
              spreadRadius: 3,
              blurRadius: 4,
              offset: const Offset(0, 2) // muda a posição da sombra
          ),
        ],
      ),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.start,
        children: [
          Image.asset(
            "assets/images/metro.png",
            width: 100,
          ),
          Column(
            mainAxisAlignment: MainAxisAlignment.spaceEvenly,
            children: [
              const Align(
                alignment: Alignment.center,
                child: Text(
                  "Acompanhe a rotas das linhas \n e estações do metrô \n de Recife",
                  style: TextStyle(
                    color: Colors.white,
                    fontSize: 12,
                    fontWeight: FontWeight.w700,
                  ),
                ),
              ),
              Padding(
                padding: const EdgeInsets.only(
                  left: 65
                ),
                child: SizedBox(
                  height: 18,
                    child: ElevatedButton(
                      onPressed: (){
                        Navigator.push(
                            context,
                            MaterialPageRoute(builder:
                            ((context) => const selecaoLinha())
                            )
                        );
                      },
                      style: ButtonStyle(
                        elevation: MaterialStateProperty.all(0),
                          foregroundColor: MaterialStateProperty.all(Colors.black),
                          backgroundColor:MaterialStateProperty.all(blueDetails),
                          shape: MaterialStateProperty.all<RoundedRectangleBorder>(
                              RoundedRectangleBorder(
                                borderRadius: BorderRadius.circular(3),
                              )
                          )
                      ),
                      child: const Text(
                        "VER LINHAS",
                        style: TextStyle(
                            fontSize: 12,
                            fontWeight: FontWeight.w600
                        ),
                      ),
                    ),
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }
}

目标页面selecaoLinha代码 #

import 'package:flutter/material.dart';
import 'package:metroguia/pages/linha__selecionada/linha__centro_jaboatao/linha__jaboatao.dart';

class selecaoLinha extends StatefulWidget {
  const selecaoLinha({Key? key}) : super(key: key);

  @override
  State<selecaoLinha> createState() => _selecaoLinhaState();
}

class _selecaoLinhaState extends State<selecaoLinha> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Jaboatao()
    );
  }
}

排查与解决办法 #

• 强制使用根导航器：如果当前context没有关联到Navigator，可以使用Navigator.of(context, rootNavigator: true)获取根导航器，修改按钮的onPressed回调：

  onPressed: (){
    Navigator.of(context, rootNavigator: true).push(
      MaterialPageRoute(builder: ((context) => const selecaoLinha()))
    );
  },
  

• 修正类命名规范：Dart中类名需以大写字母开头，将selecaoLinha改为SelecaoLinha，避免潜在语法或逻辑问题：
  修正后的目标页面代码：

  class SelecaoLinha extends StatefulWidget {
    const SelecaoLinha({Key? key}) : super(key: key);
  
    @override
    State<SelecaoLinha> createState() => _SelecaoLinhaState();
  }
  
  class _SelecaoLinhaState extends State<SelecaoLinha> {
    @override
    Widget build(BuildContext context) {
      return Scaffold(
        body: Jaboatao()
      );
    }
  }
  

  同步修改跳转代码：

  MaterialPageRoute(builder: ((context) => const SelecaoLinha()))
  

• 排查目标页面的子组件：临时将Jaboatao()替换为简单测试组件，确认是否是该组件导致页面无法加载：

  return Scaffold(
    body: const Center(child: Text("测试跳转成功")),
  );
  

  如果测试页面能正常显示，说明问题出在Jaboatao组件内部，需要进一步排查该组件的代码逻辑。

内容的提问来源于stack exchange，提问作者Flavio Henrique