UIContentSizeCategoryDidChangeNotification not working on simulator iOS 9.3, does work on device

Question

I have an observer for UIContentSizeCategoryDidChangeNotification that gets triggerd when a user changes the font-size under settings -> accessibility.

   NSNotificationCenter.defaultCenter().addObserver(self, selector: "preferredContentSizeChanged:", name: UIContentSizeCategoryDidChangeNotification, object: nil)

I've never experienced any problems with this before, but now i am having problems with it on the iphone simulator iOS 9.3. It works however on a real device with iOS 9.3.

The simulator returns

bogus value for UIPreferredContentSizeCategoryName: (null)

Has anyone else experienced the same problem?

Answer 1

It seems like a bug in iOS, I have written this:

print(UIApplication.sharedApplication().preferredContentSizeCategory)

And I found, when the app is running on a real device with iOS 9.3, the console info could be UICTContentSizeCategoryXXXL、UICTContentSizeCategoryXXL、UICTContentSizeCategoryXL、UICTContentSizeCategoryL、UICTContentSizeCategoryM、UICTContentSizeCategoryS、UICTContentSizeCategoryXS

But when the app in running on iOS simulator with iOS 9.3, the console info is always UICTContentSizeCategoryL, no matter what font size I chose in settings.