Flutter 【BottomNavigationBar】

版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。

本文链接： https://blog.csdn.net/qq_14993375/article/details/95018532

---

BottomNavigationBar

常见的属性:

属性	描述
items	List 底部导航 条按钮集合
iconSize	icon
currentIndex	默认选中第几个
onTap	选中变化回调函数
fixedColor	选中的颜色
type	BottomNavigationBarType.fixed BottomNavigationBarType.shifting

import 'tabs/Home.dart';
import 'tabs/Category.dart';
import 'tabs/Setting.dart';

class Tabs extends StatefulWidget {
  Tabs({Key key}) : super(key: key);

  _TabsState createState() => _TabsState();
}

class _TabsState extends State<Tabs> {

  int _currentIndex=0;
  List _pageList=[
    HomePage(),
    CategoryPage(),
    SettingPage(),
  ];
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text("Flutter Demo"),
        ),
        body: this._pageList[this._currentIndex],
        bottomNavigationBar: BottomNavigationBar(
          currentIndex: this._currentIndex,   //配置对应的索引值选中
          onTap: (int index){
              setState(() {  //改变状态
                  this._currentIndex=index;
              });
          },
          iconSize:36.0,      //icon的大小
          fixedColor:Colors.red,  //选中的颜色  
          type:BottomNavigationBarType.fixed,   //配置底部tabs可以有多个按钮
          items: [
            BottomNavigationBarItem(
              icon: Icon(Icons.home),
              title: Text("首页")
            ),
             BottomNavigationBarItem(
              icon: Icon(Icons.category),
              title: Text("分类")
            ),
            
             BottomNavigationBarItem(
              icon: Icon(Icons.settings),
              title: Text("设置")
            )
          ],
        ),
      );
  }
}

仿咸鱼app底部tabs

FloatingActionButton 浮动按钮

属性	描述
child	子视图，一般为 Icon，不推荐使用文字
tooltip	FAB 被长按时显示，也是无障碍功能
backgroundColor	背景颜色
elevation	未点击的时候的阴影
hignlightElevation	点击时阴影值，默认 12.0
onPressed	点击事件回调
shape	可以定义 FAB 的形状等
mini	是否是 mini 类型默认 false

import 'tabs/Home.dart';
import 'tabs/Category.dart';
import 'tabs/Setting.dart';

class Tabs extends StatefulWidget {
  final index;
  Tabs({Key key, this.index = 0}) : super(key: key);

  _TabsState createState() => _TabsState(this.index);
}

class _TabsState extends State<Tabs> {
  int _currentIndex;
  _TabsState(index) {
    this._currentIndex = index;
  }

  List _pageList = [
    HomePage(),
    CategoryPage(),
    SettingPage(),
  ];
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Flutter App"),
      ),
      floatingActionButton: Container(
        height: 80,
        width: 80,
        padding: EdgeInsets.all(8),
        margin: EdgeInsets.only(top: 10),
        decoration: BoxDecoration(
          borderRadius: BorderRadius.circular(40),
          color: Colors.white,
        ),
        child: FloatingActionButton(
          child: Icon(Icons.add),
          onPressed: () {
            setState(() {
              //改变状态
              this._currentIndex = 1;
            });
          },
          backgroundColor: this._currentIndex == 1 ? Colors.red : Colors.yellow,
        ),
      ),
      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
      body: this._pageList[this._currentIndex],
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: this._currentIndex, //配置对应的索引值选中
        onTap: (int index) {
          setState(() {
            //改变状态
            this._currentIndex = index;
          });
        },
        iconSize: 36.0, //icon的大小
        fixedColor: Colors.red, //选中的颜色
        type: BottomNavigationBarType.fixed, //配置底部tabs可以有多个按钮
        items: [
          BottomNavigationBarItem(icon: Icon(Icons.home), title: Text("首页")),
          BottomNavigationBarItem(
              icon: Icon(Icons.category), title: Text("分类")),
          BottomNavigationBarItem(icon: Icon(Icons.settings), title: Text("设置"))
        ],
      ),
    );
  }
}