当NSStatusItem被隐藏时被告知

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我有一个应用程序使用 NSStatusItem 。在小屏幕上，状态栏中没有太多空间。当用户切换到具有许多菜单项的应用程序时，我的状态项被隐藏。有没有办法获得这方面的通知？

I have an app which uses an NSStatusItem. On small screens there's not much space in the status bar. When a user switches to an application with a lot of menu items, my status item gets hidden. Is there a way to get notified about this?

到目前为止我尝试了：

• 我检查了 NSNotification 是否被触发：否
• 我检查了 statusView 从视图层次结构中移除：否
• 我选中了 isHiddenOrHasHiddenAncestor ：否

• I checked if any NSNotification is fired: No
• I checked if the statusView is removed from the view hierarchy: No
• I checked isHiddenOrHasHiddenAncestor: No

这是我用来创建状态项的代码。

Here's the code I use to create the status item.

self.statusItem = [[NSStatusBar systemStatusBar] statusItemWithLength:NSVariableStatusItemLength]; MyStatusView *maView = [[[MyStatusView alloc] initWithFrame:CGRectMake(0, 0, 50, 22)] autorelease]; [statusItem setTitle:@"Ma Status Item"]; [statusItem setView:maView];

推荐答案

项目被隐藏，其窗口将被移动到背景中。

It's pretty smart of you to realize that when a status item is hidden, its window will be moved into the background.

现在您要查找的通知是： NSWindowDidResignKeyNotification （或 NSWindowDidResignMainNotification 取决于应用程序的上下文）

Now the notification you're looking for is: NSWindowDidResignKeyNotification (or NSWindowDidResignMainNotification depending on the context of your application)

有关键窗口和主窗口之间区别的清楚说明，请参阅 this 。

For a clear explanation about the difference between a key window and a main window, see this.