如何获取当前活动的UIEvent？

Question

Background

I have a custom UIWindow implementation that posts a notification in the sendEvent method. Then I have a custom view that, once added to the window hierarchy, removes itself from superview as soon as the mentioned notification is posted (ie tapping anywhere, in this view or not, removes the view). Finally, I have a button that causes this custom view to be added to the view hierarchy. Now the problem is that when I tap this button, the view gets added to the view hierarchy, BUT, the event that was caused by this tap reaches my custom UIWindow sendEvent method AFTER the custom view is added, thus resulting in the custom view being removed immediately after it has been added.

Question

I want to somehow access whatever UIEvent is currently active. Is this possible to do, and if yes, then how?

Answer 1

I solved this by listening for the notification in order to track the most recent UIEvent (I provided the UIEvent in the userInfo). Then, when receiving the notification again, I made sure that it is not the same event as the one that occured just before the custom view appeared (if it is, I skip the removal of the custom view).

While this is an answer to my question, the solution to the underlaying problem that @matt proposed in an answer to the following SO question turned out to be much better: How can I know when any of the objects on screen were tapped?