一尘不染

如何使用Flutter AnimationController和Transform旋转图像?

flutter

我有星星png图像,我需要使用Flutter AnimationController和Transformer旋转星星。我找不到图像旋转动画的任何文档或示例。

任何想法如何使用Flutter AnimationController和Transform旋转图像?

更新:

class _MyHomePageState extends State<MyHomePage>  with TickerProviderStateMixin {

  AnimationController animationController;

  @override
  void initState() {
    super.initState();
    animationController = new AnimationController(
      vsync: this,
      duration: new Duration(milliseconds: 5000),
    );
    animationController.forward();
    animationController.addListener(() {
      setState(() {
        if (animationController.status == AnimationStatus.completed) {
          animationController.repeat();
        }
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return new Container(
      alignment: Alignment.center,
      color: Colors.white,
      child: new AnimatedBuilder(
        animation: animationController,
        child: new Container(
          height: 80.0,
          width: 80.0,
          child: new Image.asset('images/StarLogo.png'),
        ),
        builder: (BuildContext context, Widget _widget) {
          return new Transform.rotate(
            angle: animationController.value,
            child: _widget,
          );
        },
      ),
    );
  }
}

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2020-08-13

共1个答案

一尘不染

这是我旋转图像的示例。我不知道-但也许适合您

AnimationController rotationController;

@override
void initState() {
  rotationController = AnimationController(duration: const Duration(milliseconds: 500), vsync: this);
  super.initState();
}
//...
RotationTransition(
  turns: Tween(begin: 0.0, end: 1.0).animate(rotationController),
  child: ImgButton(...)
//...
rotationController.forward(from: 0.0); // it starts the animation

UPD-如何解决问题Transform.rotate

在您的情况下,所有功能均与您编写的完全一样-
它将图像从0.0旋转到1.0(这是的默认参数AnimationController)。对于完整的圆,您必须将上参数设置为2 * pi(来自math程序包)

import 'dart:math';
//...
animationController = AnimationController(vsync: this, duration: Duration(seconds: 5), upperBound: pi * 2);
2020-08-13