报错The getter 'value' was called on null

Question

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

Answer 1

CrazyCodeBoy 2021-03-24 09:14:19

animation加个空判断