為什么flutter中的小部件在Tab上不起作用？-有解無憂

**當我點擊一個小部件時，螢屏不會改變，直到我再次保存檔案。

這是我單擊小部件時的日志： D/skia ( 5395): Errors: D/skia ( 5395): 鏈接失敗但沒有提供資訊日志 D/skia ( 5395): Shader compiler error D/skia ( 5395) ): ------------------------ D/skia (5395): 錯誤: D/skia (5395): 鏈接失敗但沒有提供資訊日志**

這是代碼

import 'package:flutter/material.dart';
import 'package:flutter_cubit/pages/navpages/bar_item_page.dart';
import 'package:flutter_cubit/pages/navpages/home_page.dart';
import 'package:flutter_cubit/pages/navpages/my_page.dart';
import 'package:flutter_cubit/pages/navpages/search_page.dart';

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

  @override
  _MainPageState createState() => _MainPageState();
}

class _MainPageState extends State<MainPage> {
  List pages=[
    HomePage(),
    BarItemPage(),
    SearchPage(),
    MyPage()
  ];
  int currentIndex=0;
  void onTap(int index){
    currentIndex=index;
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: pages[currentIndex],
      bottomNavigationBar: BottomNavigationBar(
        unselectedFontSize: 0,
        selectedFontSize: 0,
        type: BottomNavigationBarType.fixed,
        backgroundColor: Colors.white,
        onTap: onTap,
        currentIndex: currentIndex,
        selectedItemColor: Colors.black54,
        unselectedItemColor: Colors.grey.withOpacity(0.5),
        showUnselectedLabels: false,
        showSelectedLabels: false,
        elevation: 0,

        items: [
          BottomNavigationBarItem(title: Text("Home"), icon: Icon(Icons.apps)),
          BottomNavigationBarItem(title: Text("Bar"), icon: Icon(Icons.bar_chart_sharp)),
          BottomNavigationBarItem(title: Text("Search"), icon: Icon(Icons.search)),
          BottomNavigationBarItem(title: Text("My"), icon: Icon(Icons.person)),
        ],
      ),
    );
  }
}

uj5u.com熱心網友回復：

你不是在呼叫 setState。因此將 onTap 更改為以下代碼：

void onTap(int index){
  setState(() {
    currentIndex=index;
  }); 
}

轉載請註明出處，本文鏈接：https://www.uj5u.com/caozuo/393790.html

標籤：扑安卓工作室镖

上一篇：如何解決顫振堆疊小部件問題

下一篇：當用戶單擊按鈕時，我想要振動，我實作了HapticFeedback但它不起作用