flutter BoxConstraint给出负的最小高度

unhi4e5o  于 2022-12-05  发布在  Flutter
关注(0)|答案(1)|浏览(210)

我尝试使用Animation.curve制作徽标动画,但当我使用Curves.elasticInOut时,我收到错误消息“BoxConstraints具有负的最小高度"。...请帮助

class InitState extends State<SplashScreen> with SingleTickerProviderStateMixin {

后期动画控制器控制器;后期动画_动画;

void initState() {
super.initState();

_controller = AnimationController(vsync: this, duration: const Duration(seconds: 5));

_animation = CurvedAnimation(parent: _controller, curve: Curves.elasticInOut);

_controller.forward();

_animation.addStatusListener((status) {
  if (status == AnimationStatus.completed) {
    startTimer();
  }
});

_controller.addListener(() {
  setState(() {});
});


Widget initWidget() {
return Scaffold(
  body: Stack(
    children: [
      Container(
        decoration: const BoxDecoration(
          color: Color(0xff0d0d0d),
          gradient: LinearGradient(
            colors: [
              (Color(0xff3F3F3F)),
              (Color(0xff2D2D2D)),
            ],
            begin: Alignment.topCenter,
            end: Alignment.topCenter,
          ),
        ),
      ),
      Center(
        child: SizedBox(
          height: _animation.value * 100,
          child: Image.asset('assets/images/foodie_logo.png'),//This is where I get the error
        ),
      )
u91tlkcl

u91tlkcl1#

如果您检查Curves.elasticInOut动画的documentation,您可以看到该值可以是负数:

用另一个非负值的动画更改动画:
https://api.flutter.dev/flutter/animation/Curves-class.html

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