With Split Screen on iPad, you may end up with two active windows of the same app. When I was working on building the menu system, I encountered the problem: how can I know which window scene is “active and current”, the same scene that invoked keyboard shortcuts?
In UIKit, the UIApplication class has a property named keyWindow. This property is marked as deprecated in iOS 13.0, accompanied by a message from Apple:
‘keyWindow’ was deprecated in iOS 13.0: Should not be used for applications that support multiple scenes as it returns a key window across all connected scenes
So what’s its replacement for iOS 15?
TL;DR. As indicated by @saafo on Stackoverflow:
Although UIApplication.shared.keyWindow is deprecated after iOS 13.0 by Apple, it seems this attribute can help you find the active one when multiple scenes [are] in the foreground by using:
UIApplication.shared.keyWindow?.windowScene
So… there you have it. I have no idea why Apple marked keyWindow as deprecated. You should continue to use it until Apple finally replaces it with something functional, or when it becomes obsolete.
Below, I’ll discuss two attempts that did not work as of today on iPadOS 15.0.2.
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