Flutter动画和运动控件之透明度的变化FadeTransition

最新推荐文章于 2025-06-10 14:17:01 发布

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最新推荐文章于 2025-06-10 14:17:01 发布 · 282 阅读

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本文介绍如何使用Flutter库中的FadeTransition组件，通过自定义动画控制器实现从透明到不透明的渐变过渡，以Flutter logo为例展示其用法。

/// Flutter code sample for FadeTransition

// The following code implements the [FadeTransition] using
// the Flutter logo:

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';

  @override
  Widget 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);

  @override
  _MyStatefulWidgetState createState() => _MyStatefulWidgetState();
}

/// This is the private State class that goes with MyStatefulWidget.
/// AnimationControllers can be created with `vsync: this` because of TickerProviderStateMixin.
cl