问题描述
我的应用程序的最上层有一个 BottomNavigationBar.我想基本上在应用程序/子树中的任何地方检测键盘打开/关闭，这样我就可以在键盘可见时显示/隐藏 BottomNavigationBar.
I have a BottomNavigationBar at the upper-most level of my app. I want to detect keyboard open/close basically anywhere in the app/subtree, so i can show/hide the BottomNavigationBar whenever the keyboard is visible.
这是一个普遍问题，可能与 BottomNavigationBar 没有直接关系.换句话说，抽象自 BottomNavigationBar :-)
This is a general issue and may not be directly related to the BottomNavigationBar. In other words, abstract from the BottomNavigationBar :-)
推荐答案
要检查键盘可见性，只需检查 viewInsets 属性位于小部件树中的任何位置.当 viewInsets.bottom 等于 0 时，键盘隐藏.
To check for keyboard visibility, just check for the viewInsets property anywhere in the widget tree. The keyboard is hidden when viewInsets.bottom is equal to zero.
您可以使用 MediaQuery 来检查 viewInsets，例如:
You can check for the viewInsets with MediaQuery like:
MediaQuery.of(context).viewInsets.bottom
希望有所帮助！
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