Flutter20个小实例免费视频教程

https://www.bilibili.com/video/BV1kt411B7mu

P1 01节底部导航栏和切換效果的制作-1

Scaffold脚手架

动态flutter 快捷键 stful

P2 02节底部导航栏和切换效果的制作-2

import 'package:flutter/material.dart';
import 'pages/airplay_screen.dart';
import 'pages/email_screen.dart';
import 'pages/pages_screen.dart';
import 'pages/home_screen.dart';

class BottomNavigationWidget extends StatefulWidget {
  const BottomNavigationWidget({super.key});

  @override
  State<BottomNavigationWidget> createState() => _BottomNavigationWidgetState();
}

class _BottomNavigationWidgetState extends State<BottomNavigationWidget> {
  final _BottomNavigationColor = Colors.blue;
  int _currentIndex = 0;
  // List<Widget> list=List();//old
  List<Widget> list = <Widget>[];

  @override
  void initState() {
    list
      ..add(HomeScreen())
      ..add(EmailScreen())
      ..add(PagesScreen())
      ..add(AirplayScreen());
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: list[_currentIndex],
      bottomNavigationBar: BottomNavigationBar(
        fixedColor: Colors.red, //current item
        type: BottomNavigationBarType.fixed, //item > 3时必须要设置,不然未选中项字体颜色变白
        onTap: (index) {
          setState(() {
            _currentIndex = index;
          });
        },
        currentIndex: _currentIndex,
        items: [
          BottomNavigationBarItem(
              icon: Icon(
                Icons.home,
                color: _BottomNavigationColor,
              ),
              // title: Text('Home')),//old
              label: 'Home'),
          BottomNavigationBarItem(
              icon: Icon(
                Icons.email,
                color: _BottomNavigationColor,
              ),
              // title: Text('Home')),//old
              label: 'Email'),
          BottomNavigationBarItem(
              icon: Icon(
                Icons.pages,
                color: _BottomNavigationColor,
              ),
              // title: Text('Home')),//old
              label: 'Pages'),
          BottomNavigationBarItem(
              icon: Icon(
                Icons.airplay,
                color: _BottomNavigationColor,
              ),
              // title: Text('Home')),//old
              label: 'Airplay'),
        ],
      ),
    );
  }
}

P3 03节不规则底部工具栏的制作-1

P4 04节不规则底部工具栏的制作-2
P5 05节路由跳转的动画效果1

P6 06节路由跳转的动画效果2

import 'package:flutter/material.dart';

class CustomeRouter extends PageRouteBuilder {
  final Widget widget;
  CustomeRouter(this.widget)
      : super(
            transitionDuration: Duration(seconds: 1),
            pageBuilder: (
              BuildContext context,
              Animation<double> animation1,
              Animation<double> animation2,
            ) {
              return widget;
            },
            transitionsBuilder: (BuildContext Context,
                Animation<double> animation1,
                Animation<double> animation2,
                Widget child) {
              //渐隐渐显的路由动画效果
              // return FadeTransition(
              //   opacity: Tween(begin: 0.0, end: 1.0).animate(CurvedAnimation(
              //       parent: animation1, curve: Curves.fastOutSlowIn)),
              //   child: child,
              // );

              //缩放的动画效果
              // return ScaleTransition(
              //   scale: Tween(begin: 0.0, end: 1.0).animate(CurvedAnimation(
              //       parent: animation1, curve: Curves.fastOutSlowIn)),
              //   child: child,
              // );

              //旋转+缩放动画效果
              // return RotationTransition(
              //   turns: Tween(begin: 0.0, end: 1.0).animate(CurvedAnimation(
              //       parent: animation1, curve: Curves.fastOutSlowIn)),
              //   child: ScaleTransition(
              //     scale: Tween(begin: 0.0, end: 1.0).animate(CurvedAnimation(
              //         parent: animation1, curve: Curves.fastOutSlowIn)),
              //     child: child,
              //   ),
              // );

              //左右滑动动画
              return SlideTransition(
                position: Tween<Offset>(
                        begin: Offset(-1.0, 0.0), end: Offset(0.0, 0.0))
                    .animate(CurvedAnimation(
                        parent: animation1, curve: Curves.fastOutSlowIn)),
                child: child,
              );
            });
}

P7 07节磨砂玻璃的效果制作

Fliter Widget 消耗性能

import 'package:flutter/material.dart';
import 'dart:ui';

class FrostedGlassDemo extends StatelessWidget {
  const FrostedGlassDemo({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        children: [
          ConstrainedBox(
            constraints: BoxConstraints.expand(),
            child: Image.network(
                'https://img0.baidu.com/it/u=3827844244,2735061184&fm=253&app=120&size=w931&n=0&f=JPEG&fmt=auto?sec=1722531600&t=b10aa9435310a27ec847a535b6894521'),
          ),
          Center(
            child: ClipRect(
              //可裁切的矩形
              child: BackdropFilter(
                //背景过滤器
                filter: ImageFilter.blur(sigmaX: 5.0, sigmaY: 5.0),
                child: Opacity(
                  opacity: 0.5,
                  child: Container(
                    width: 500.0,
                    height: 700.0,
                    decoration: BoxDecoration(color: Colors.grey.shade200),
                    child: Center(
                      child: Text(
                        'KooTeam',
                        style: Theme.of(context).textTheme.displayLarge,
                      ),
                    ),
                  ),
                ),
              ),
            ),
          )
        ],
      ),
    );
  }
}

P8 08节保持页面状态-1
P9 09节保持页面状态-2

keep alive

P10 10节不简单的搜索条-1

P11 11节不简单的搜索条-2
P12 12节Wrap流式布局

P13 13节展开闭合案例ExpansionTile控件

ExpansionTile 折叠tab

P14 14节展开闭合列表案例ExpansionPanelList控件
P15 15节路径裁切和二次贝塞尔曲线的讲解
P16 16节路径裁切浪型贝塞尔曲线绘制
P17 17节APP闪屏动画制作
P18 18节右滑返回上一页效果制作
P19 19节轻量级提示操作ToolTip
P20 20节Draggable拖拽控件讲解和实例演示

命令行 r 热更新

大写R 去缓存更新