问问题
231 次
1 回答
1
Dart 2.12 added stricter type checking to catch cases where callbacks return unused values.
IconButton.onPressed is a VoidCallback?; that is, if it isn't null, it is a function that returns nothing.
You are supplying an anonymous function that has return polygonList; in it. That returned value can never be used, so the return statement is useless. Simply remove it.
于 2021-05-18T12:37:01.227 回答