widget - 小部件库抛出的异常 '!children.any((Widget child) => child == null)' : is not true

Question

您好，我在运行应用程序时遇到以下错误 问题的可能原因是什么？

══╡ 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((Widgetchild) => child == null)': is not true. 

Answer 1

几天前遇到了同样的问题。

当您忘记或错过返回小部件时，就会发生这种情况。

如果没有看到您的代码，就很难知道确切的故障点。

就我而言，我以前的代码是这样的:

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

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

修复后::

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

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

希望这对您有所帮助!