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This article mainly introduces "Flutter development how to achieve the bottom message board". In daily operation, I believe many people have doubts about how to achieve the bottom message board in Flutter development. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubts about "how to achieve the bottom message board in Flutter development". Next, please follow the editor to study!

Main technology

In fact, this technology is realized by encapsulating the function of animation.

Case code analysis

Initialize encapsulation

/ * initialization state * / initState () {super.initState (); / * create animation control object * / controller = new AnimationController (duration: const Duration (milliseconds: 1000), vsync: this) / * create a tweened object * / tween = new Tween (begin: 0.0,1.0) .animate (controller) / / return an Animation object. AddListener (() {/ / add listening setState (() {Provide.value (context) .changHeight (tween.value); / / print (tween.value); / / print tweened interpolation}) }); / / controller.forward (); / / execute animation} all codes import 'package:flutter/material.dart';void main () {runApp (debugShowCheckedModeBanner: false, home: cityContent (),);} class cityContent extends StatefulWidget {cityContent ({Key key}): super (key: key); _ cityContentState createState () = > _ cityContentState ();} class _ cityContentState extends State with SingleTickerProviderStateMixin {Animation tween; AnimationController controller / * initialization state * / initState () {super.initState (); / * create animation control object * / controller = new AnimationController (duration: const Duration (milliseconds: 1000), vsync: this) / * create a tweened object * / tween = new Tween (begin: 0.0,1.0) .animate (controller) / / return an Animation object. AddListener (() {/ / add listening setState (() {Provide.value (context) .changHeight (tween.value); / / print (tween.value); / / print tweened interpolation}) }); / / controller.forward (); / / execute animation} @ override Widget build (BuildContext context) {return Scaffold (body: Stack (children: [InkWell (onTap:) {/ / Action is executed in the opposite direction, that is, close the message board controller.reverse () }, child: ListView (children: [Center (child: InkWell (onTap:) {controller.forward ()) / / perform animation That is, open the message board}, child: Text ('Open bottom drawer'),],), Positioned (bottom: 0 Child: Container (margin: EdgeInsets.fromLTRB (20,0,20,0), height: 400*controller.value, width: 300, color: Colors.grey.shade300, child: ListView (/ / physics: NeverScrollableScrollPhysics () Children: [Container (margin: EdgeInsets.only (left: 240,240), child: InkWell (onTap: () {/ / Action in the opposite direction) That is, close the message board controller.reverse () }, child: Icon (Icons.clear),), Center (child: Text ('message list')],),)),] )) }} at this point, the study on "how to achieve the bottom message board in Flutter development" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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