Flutter 动画设计之AnimatedBuilder

AnimatedBuilder是用于构建动画的通用小组件。

The Widget's build needs to be called every time the animation's
      // value changes. So add a listener here that will call setState()
      // and trigger the build() method to be called by the framework.
      // If your Widget's build is relatively simple, this is a good option.
      // However, if your build method returns a tree of child Widgets and
      // most of them are not animated you should consider using
      // AnimatedBuilder instead.

相对较为简单的动画组件是 AnimatedWidget。

第一步，创建一个动画，

第二步，通过build方法，将动画装入。

使用预构建的子组件可以提高效率。

视频网址为：https://www.bilibili.com/video/BV1sT4y1J7nr

下面是一个旋转的动画示例

/// Flutter code sample for AnimatedBuilder// This code defines a widget that spins a green square continually. It is
// built with an [AnimatedBuilder] and makes use of the [child] feature to
// avoid having to rebuild the [Container] each time.import 'dart:math' as math;import 'package:flutter/material.dart';void main() => runApp(const MyApp());/// This is the main application widget.
class MyApp extends StatelessWidget {const MyApp({Key? key}) : super(key: key);static const String _title = 'Flutter Code Sample';@overrideWidget build(BuildContext context) {return const MaterialApp(title: _title,home: MyStatefulWidget(),);}
}/// This is the stateful widget that the main application instantiates.
class MyStatefulWidget extends StatefulWidget {const MyStatefulWidget({Key? key}) : super(key: key);@overrideState<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}/// This is the private State class that goes with MyStatefulWidget.
/// AnimationControllers can be created with `vsync: this` because of TickerProviderStateMixin.
class _MyStatefulWidgetState extends State<MyStatefulWidget>with TickerProviderStateMixin {late final AnimationController _controller = AnimationController(duration: const Duration(seconds: 10),vsync: this,)..repeat();@overridevoid dispose() {_controller.dispose();super.dispose();}@overrideWidget build(BuildContext context) {return AnimatedBuilder(animation: _controller,child: Container(width: 200.0,height: 200.0,color: Colors.green,child: const Center(child: Text('Whee!'),),),builder: (BuildContext context, Widget? child) {return Transform.rotate(angle: _controller.value * 2.0 * math.pi,child: child,);},);}
}

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