当我使用animationbuilder单击动画时，如何使动画重复？颤动/飞镖答案

【问题标题】：How I do make my animation repeat when I click on it with animatedbuilder? flutter/dart当我使用animationbuilder单击动画时，如何使动画重复？颤动/飞镖
【发布时间】：2020-07-23 00:12:42
【问题描述】：

我正在开发一个自定义动画按钮。每次用户点击它时，我都想重复动画。因此，当用户单击它时，容器会扩大。并恢复正常大小。当用户再次点击它时，它会再次点击它。现在动画只是放大到定义的大小并停止。之后就什么都做不了了。

class CustomAnimation extends StatefulWidget {
  @override
  _CustomAnimationState createState() => _CustomAnimationState();
}

class _CustomAnimationState extends State<CustomAnimation> with SingleTickerProviderStateMixin {

  AnimationController _controller;

  @override
  void initState() {
    // TODO: implement initState

    _controller = AnimationController(
      vsync: this,
      duration: Duration(seconds: 2),
    );
    _controller.addListener(() {
      setState(() {
        //do something
      });
    });
    _controller.forward();
    super.initState();
  }

  @override
  void dispose() {
    // TODO: implement dispose
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: AnimatedBuilder(
          animation: _controller.view,
          builder: (context,child){
            return Transform.scale(scale: _controller.value *.9,
                child: Container(
                  width: 200,
                  height: 200,
                  color: Colors.lightGreen[200],
                  child: Center(
                    child: Text('Animation test'),
                  ),
                ),
            );
          },
        ),

      )
    );
  }
}

【问题讨论】：

标签： flutter animation dart vsync animationcontroller

【解决方案1】：

您可以在下面复制粘贴运行完整代码
您可以收听AnimationStatus.completed 并拨打_controller.reverse()
并使用InkWell 调用_controller.forward();

 animation = Tween<double>(begin: 1.0, end: 1.2).animate(_controller)
      ..addStatusListener((status) {
        if (status == AnimationStatus.completed) {
          _controller.reverse();
        }
      });
...   
return Transform.scale(
            scale: animation.value,
            child: InkWell(
              onTap: () {
                _controller.forward();
              },

工作演示

完整代码

import 'package:flutter/material.dart';

class CustomAnimation extends StatefulWidget {
  @override
  _CustomAnimationState createState() => _CustomAnimationState();
}

class _CustomAnimationState extends State<CustomAnimation>
    with SingleTickerProviderStateMixin {
  AnimationController _controller;
  Animation<double> animation;

  @override
  void initState() {
    _controller =
        AnimationController(vsync: this, duration: Duration(seconds: 2));
    _controller.addListener(() {
      setState(() {
        //do something
      });
    });

    _controller.forward();
    animation = Tween<double>(begin: 1.0, end: 1.2).animate(_controller)
      ..addStatusListener((status) {
        if (status == AnimationStatus.completed) {
          _controller.reverse();
        }
      });
    super.initState();
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Center(
          child: AnimatedBuilder(
            animation: animation,
            builder: (context, child) {
              return Transform.scale(
                scale: animation.value,
                child: InkWell(
                  onTap: () {
                    _controller.forward();
                  },
                  child: Container(
                    width: 200,
                    height: 200,
                    color: Colors.lightGreen[200],
                    child: Center(
                      child: Text('Animation test'),
                    ),
                  ),
                ),
              );
            },
          ),
        ));
  }
}

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: CustomAnimation(),
    );
  }
}

【讨论】：