UIAccessibilityPrefersCrossFadeTransitionsStatusDidChangeNotification does not get triggered

Question

Created Jan ’22

Replies 2

Boosts 0

Participants 2

I'm trying to listen for changes on the Prefers Cross-Fade Transitions accessibility option using UIKit in Objective-C but for some reason UIAccessibilityPrefersCrossFadeTransitionsStatusDidChangeNotification does not get triggered when I toggle this option in the accessibility settings, I've tested both using the simulator and a real device running iOS 15.2

According to the docs this should be fine https://developer.apple.com/documentation/uikit/uiaccessibilitypreferscrossfadetransitionsstatusdidchangenotification?language=objc

Here is a little snapshot of the code I'm using

- (void)prefersCrossFadeTransitionsStatusDidChange:(__unused NSNotification *)notification
{
  NSLog(@"Prefers Cross-Fade Transitions changed");
}


[[NSNotificationCenter defaultCenter] addObserver:self
                            selector:@selector(prefersCrossFadeTransitionsStatusDidChange:)
                              name:UIAccessibilityPrefersCrossFadeTransitionsStatusDidChangeNotification
                             object:nil];

Wirdly enough UIAccessibilityPrefersCrossFadeTransitions returns the correct value when called

Answered by Apple Designer in 702961022

Confirmed this is a bug. Will be addressed soon

Boost

Answer 1

gabrieldonadel OP

Jan ’22

I've also tested this using Swift and it does not work either. prefersCrossFadeTransitionsStatusChanged is never triggered

 NotificationCenter.default.addObserver(self, selector: #selector(prefersCrossFadeTransitionsStatusChanged(_:)), name: UIAccessibility.prefersCrossFadeTransitionsStatusDidChange, object: nil)

   @objc func prefersCrossFadeTransitionsStatusChanged(_ notif: NSNotification) {
    print("prefers Cross Fade Transitions Status Changed")
  }

0

Answer 2

Apple Designer OP

Apple

Jan ’22

Accepted Answer

Confirmed this is a bug. Will be addressed soon

1