报错The getter 'value' was called on null

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报错The getter 'value' was called on null

来源：7-6 动画Animation开发指南-AnimatedWidget与AnimatedBuilder-1【跟着做】

叶乔

2021-03-23

图片描述
图上标红的代码报如下错误：
======== Exception caught by widgets library =======================================================
The following NoSuchMethodError was thrown building LogoApp(dirty, state: _LogoAppState#6dba8(ticker inactive)):
The getter ‘value’ was called on null.
Receiver: null
Tried calling: value

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CrazyCodeBoy

CrazyCodeBoy

2021-03-24

animation加个空判断

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