如何在按住Command键的情况下在NSView中检测keyUp ：？ [英] How do I detect keyUp: in my NSView with the Command key held?

问题描述

在我的NSView子类中，例如，键入Command + J时，我看到按下Command的 flagsChanged：，然后按下 J的keyDown： ...然后释放Command的 flagsChanged：。我从没见过J的 keyUp：。

In my NSView subclass, when I type, for example, Command+J, I see the flagsChanged: for Command being pressed, then a keyDown: for J... and then the flagsChanged: for Command being released. I never see a keyUp: for J.

我尝试覆盖 performKeyEquivalent：，它看起来像我想要的，但是在 keyDown：！

I tried overriding performKeyEquivalent:, which looked like it did what I want, however that gets sent before the keyDown:!

那么还有什么我想赶上 keyUp：事件吗？

So is there something else I'm missing to catch the keyUp: events?

没有示例程序时间，对不起。谢谢！

No sample program this time, sorry. Thanks!

推荐答案

前一段时间我也遇到了这个问题。问题似乎是NSApplication正在消耗Cmd密钥的keyUp（或flagsChanged）。

I also ran into this issue a while ago. The problem seems to be that NSApplication is eating up the keyUp (or flagsChanged) for the Cmd key.

我实际上发现了两个解决方案。
首先是覆盖NSApplication，如此处所述：

There are actually two solutions I found. The first is overriding NSApplication as also described here:

http://lists.apple.com/archives/cocoa-dev/2003/Oct/msg00442.html

另一种是做一些自己的逻辑来检测Cmd密钥的密钥，如下所述：

The other is to do some own logic to detect the key up of the Cmd key as described here:

Command-Key-Up可可

但是，第二个选项可能不起作用，因为您不想检测Cmd keyUp而是J keyUp。不过，第一种解决方案应该可以做到这一点。

However, this second option might not work as you don't want to detect the Cmd keyUp but rather the J keyUp. This should be possible with the first solution though.

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