flutter - 'RenderObject' 类型的值不能分配给 'RenderBox' 类型的变量

Question

 void getPositions() {
  final RenderBox renderBox = scheduleForDayKey.currentContext!.findRenderObject();
  final position = renderBox.localToGlobal(Offset.zero);
  print("POSITION of Red: $position ");
}

这部分用红色下划线:

scheduleForDayKey.currentContext!.findRenderObject()

当我悬停时，它告诉我错误:

A value of type 'RenderObject' can't be assigned to a variable of type'RenderBox'.

可能这段代码已经过时了，或者是因为我在互联网上看到了很多类似的代码示例，出于某种原因对我不起作用。

Answer 1

试着写:

final RenderBox renderBox = scheduleForDayKey.currentContext!
                                             .findRenderObject() as RenderBox;