flutter - WidgetsBinding.instance.addPostFrameCallback 不再起作用

Question

我以前用

  WidgetsBinding.instance.addPostFrameCallback((_){

在构建小部件后做某事。

但是在更新颤振后会发生此错误

Error: Method 'addPostFrameCallback' cannot be called on 'WidgetsBinding?' because it is potentially null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../fvm/versions/stable/packages/flutter/lib/src/widgets/binding.dart').

有什么办法吗？？

标签： flutterdart

Answer 1

尝试像这样添加一个!之后instanceWidgetsBinding.instance!.addPostFrameCallback