问题描述
我正在开发一个Cocoa应用程序，显示打开的窗口列表，并突出显示当前焦点。我的问题是，我找不到系统通知，以通知我的应用程序，主（aka专注或前台）窗口已更改。我试过：
I'm developing a Cocoa application that shows a list of opened windows and highlights the current focused one. My problem is that I can't find a system notification to inform my app that the main (aka "focused" or "foreground") window has changed. I tried with:
[[[NSWorkspace sharedWorkspace] notificationCenter] addObserver:self selector:@selector(wsNotificationHook:) name:NSWorkspaceDidActivateApplicationNotification object:nil];
但它监视APPLICATION更改：执行窗口更改时不会触发。相同的应用程序（例如，如果我在使用exposè的两个Firefox窗口之间传递）。是否有系统范围的事件，我可以监视以跟踪主窗口的更改？
but it monitors APPLICATION change: it isn't get fired when a change of window is executed INSIDE the same application (for example, if I pass between two Firefox windows using exposè). Is there a system-wide event that I can monitor to track a change of the main window?
提前感谢！
推荐答案
你最接近的可能是可访问性API。请参阅和此处 a>对于（部分）解决方案的类似问题。
The closest you'll get will probably be the accessibility APIs. See here and here for similar questions with (partial) solutions.
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