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flutter 如何调用子widget的方法。

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flutter 如何调用子widget的方法。

写了一个下拉菜单[dropdown],内部有两个方法：
image.png

现在需要在引用[dropdown]的widget中手动关闭菜单。请问下有什么方法可以从父widget操作子widget。


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GlobalKey可以


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