Flutter Mobile Development · 课时

交错动画与基于物理的动画

使用由时间区间和自然物理弹簧模拟驱动的交错动画，在 Flutter 中创建丰富的动效。

交错动画与基于物理的动画 是 CoddyKit 上的免费 Flutter Mobile Development 课时。这是第 4 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Flutter Mobile Development 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Flutter Mobile Development 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Beyond a Single Tween

You already know implicit and explicit animations. Staggered animations sequence multiple properties on one controller, and physics-based animations make motion feel natural.

One Controller, Many Animations

A single AnimationController can drive several Animation objects, each running during a different slice of time.

final controller = AnimationController(
  vsync: this,
  duration: const Duration(seconds: 2),
);

Intervals

A CurvedAnimation with an Interval restricts an animation to a fraction of the parent timeline.

final fade = CurvedAnimation(
  parent: controller,
  curve: const Interval(0.0, 0.4, curve: Curves.easeIn),
);

Staggering Properties

Give each property its own interval so they animate in sequence — fade first, then slide, then scale.

final slide = CurvedAnimation(
  parent: controller,
  curve: const Interval(0.4, 0.7, curve: Curves.easeOut),
);
final scale = CurvedAnimation(
  parent: controller,
  curve: const Interval(0.7, 1.0, curve: Curves.elasticOut),
);

Driving the Tweens

Map each curved animation through a Tween to the values you need.

final opacity = Tween<double>(begin: 0, end: 1).animate(fade);
final offset = Tween<Offset>(
  begin: const Offset(0, 0.3), end: Offset.zero,
).animate(slide);

Building the Widget

Use AnimatedBuilder to rebuild as the controller ticks, applying every staggered value at once.

AnimatedBuilder(
  animation: controller,
  builder: (context, child) => Opacity(
    opacity: opacity.value,
    child: SlideTransition(position: offset, child: child),
  ),
  child: const Card(child: Text('Hello')),
);

Starting the Sequence

Call forward() to play. Because intervals overlap or chain, the children animate in a pleasing stagger.

@override
void initState() {
  super.initState();
  controller.forward();
}

What Are Physics Simulations?

Physics-based animations ignore fixed durations and instead model forces. A SpringSimulation produces realistic bounce and settle.

Spring Simulation

Define a SpringDescription (mass, stiffness, damping) and run it with the controller.

const spring = SpringDescription(mass: 1, stiffness: 100, damping: 10);
final sim = SpringSimulation(spring, 0, 1, 0);
controller.animateWith(sim);

Fling Gestures

The fling method launches an animation with velocity, perfect for swipe-to-dismiss or drag release.

void onDragEnd(DragEndDetails d) {
  controller.fling(velocity: d.primaryVelocity! / 1000);
}

Dispose the Controller

Always dispose the controller to free its ticker.

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

Quick Check

How do you make several properties of one controller animate in sequence rather than all at once?

Recap

You learned advanced motion:

Staggered animations via Intervals on one controller
AnimatedBuilder to apply many values together
Physics simulations with SpringSimulation and fling

These techniques make your UI feel alive and natural.

常见问题解答

「交错动画与基于物理的动画」课时是免费的吗？

是的 — 「交错动画与基于物理的动画」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Flutter Mobile Development 课程的其余内容，请升级到 CoddyKit PRO。 Flutter Mobile Development 课程共包含 4 节课。

「交错动画与基于物理的动画」这节课中我会学到什么？

使用由时间区间和自然物理弹簧模拟驱动的交错动画，在 Flutter 中创建丰富的动效。你通过在浏览器中直接运行的动手代码来练习 Flutter Mobile Development，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Flutter Mobile Development 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Flutter Mobile Development 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 4 节课，共 4 节。

「交错动画与基于物理的动画」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Flutter Mobile Development 课中编写并运行代码吗？

能。每节 Flutter Mobile Development 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

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