flutter - 如何使 BottomNavigationBarItem 不可点击并禁用点击飞溅效果？

Question

我有包含 5 个项目的 BottomNavigationBar 和应该更改第 3 个项目“照片”的 FloatingActionButton。

所以我需要如果用户按下中央 BottomNavigationBarItem“照片”，它不会影响切换到此选项卡。

如何禁止点击特定的 BottomNavigationBarItem？

这是我的代码:

import 'package:flutter/material.dart';

class MainPage extends StatefulWidget {
  @override
  _MainPageState createState() => new _MainPageState();
}

class PageInfoData {
  final String title;
  final IconData iconData;

  const PageInfoData(this.title, this.iconData);
}

class _MainPageState extends State<MainPage> {
  int _selectedIndex = 0;

  static const List<PageInfoData> pageInfo = [
    PageInfoData('History', Icons.swap_horiz),
    PageInfoData('Download', Icons.file_download),
    PageInfoData('Photo ', null),
    PageInfoData('Upload', Icons.file_upload),
    PageInfoData('Settings', Icons.settings)
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        automaticallyImplyLeading: false,
        title: Text("Menu"),
        actions: <Widget>[IconButton(icon: Icon(Icons.search, color: Colors.white,),)],
      ),
      body: Center(child: Text('Index$_selectedIndex: ${pageInfo[_selectedIndex].title}')),
      backgroundColor: Colors.white,
      bottomNavigationBar: BottomNavigationBar(
        items: new List<BottomNavigationBarItem>.generate(pageInfo.length, (int index) {
          PageInfoData curPageInfo = pageInfo[index];
          return BottomNavigationBarItem(icon: Icon(curPageInfo.iconData, size: 30.0), title: Text(curPageInfo.title, style: TextStyle(fontSize: 9.0),));
        }),
        type: BottomNavigationBarType.fixed,
        unselectedItemColor: const Color(0xff797979),
        fixedColor: Theme.of(context).primaryColor,
        backgroundColor: const Color(0xffe2e2e2),
        currentIndex: _selectedIndex,
        showUnselectedLabels: true,
        onTap: _onItemTapped,
      ),

      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
      floatingActionButton: FloatingActionButton(
        backgroundColor: Color(0xffa2a5a4),
        child: Icon(Icons.photo_camera, size: 40.0,),
          onPressed: null),
    );
  }

  void _onItemTapped(int index) {
    setState(() {
      _selectedIndex = index;
    });
  }
}

---

更新:

通过更改 _onItemTapped 函数，问题几乎解决了(谢谢 @ibhavikmakwana)

void _onItemTapped(int index) {
    if (index != 2) {
      setState(() {
        _selectedIndex = index;
      });
    }
  }

但并没有完全解决。当我点击照片标签时，它仍然显示点击飞溅效果。我可以禁用点击飞溅效果吗？

Answer 1

我遇到了和你一样的问题。在我的例子中，我只想将它应用到 bottomNavigationBar，因为我在另一个小部件上有飞溅效果。

我使用下面的代码修复了它:

bottomNavigationBar: Theme(
    data: ThemeData(
      splashColor: Colors.transparent,
      highlightColor: Colors.transparent,
    ),
    child: BottomNavigationBar(),
),