小部件库'!children.any((Widget child)=> child == null)'抛出的异常:不是真的

Question

嗨我在运行应用程序时收到以下错误可能是什么原因导致问题？

??? EXCEPTION CAUGHT BY WIDGETS LIBRARY ????????????????????????????????????????????????????????????
The following assertion was thrown building Home(dirty, state: _HomeState#f7a67):
'package:flutter/src/widgets/framework.dart': Failed assertion: line 1639: '!children.any((Widget
child) => child == null)': is not true. 

Answer 1

几天前面临同样的问题.

当您忘记或错过返回 Widget 时会发生这种情况.

如果没有看到您的代码,就很难知道确切的失败点.

就我而言,我之前的代码如下:

@override
Widget build(BuildContext context) {
//....

  new Column(
  //.....
  );
}

修好之后::

@override
Widget build(BuildContext context) {
//....

  return new Column(
  //.....
  );
}

希望这可以帮助!