我如何知道NSComboBox当前是否打开了下拉列表?
问题描述：
我怎么知道NSComboBox当前是否打开了下拉列表?
How can I know if an NSComboBox currently has the dropdown list open or not?
答
这是 NSComboBoxDelegate 协议的作用.
特别是方法 comboBoxWillPopUp:和 comboBoxWillDismiss:应该会为您提供所需的信息.
Especially the methods comboBoxWillPopUp: and comboBoxWillDismiss: should give you the information you are looking for.
文档此处.