I have an imageView which has a top constraint IBOutlet called imageViewTopConstraint. In viewWillLayoutSubviews( ) I set the imageViewTopConstraint.constant value. The imageView displays properly for all iPhone models while in portrait mode, which is good.When I switch to landscape mode, I want to disable the imageViewTopConstraint, so the viewWillLayoutSubviews( ) has the following code:if UIDevice.current.orientation.isPortrait { imageViewTopConstraint.constant = (2 * screenHeight) / 3 imageViewTopConstraint.isActive = true } else if UIDevice.current.orientation.isLandscape { imageViewTopConstraint.isActive = false }IssueWhen I run the application it is initially in portrait mode. When I switch to landscape mode I receive the following fatal error at the line where I set "imageViewTopConstraint.isActive = false" to disable the constraint (line 6 above) Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional valueAny idea what is going on or what this means?

When Game Center determines a player is forced to disconnect from a match, Game Center sends a disconnect message via the "didChange state" function. However, not all devices connected to the match are receiving the disconnect state change message. One device will think the player is disconnected, but there is still messaging passing from the (supposedly) disconnected player to the other players in the match.The only way I can think to resolve this issue is have all players poll Game Center to obtain updated match information. Based on this updated match information then all players can determine what players are truly still connected properly or not.Can Game Center be polled to obtained updated match information? If so, how?Any other ideas how to resolve the issue when all players do not receive the same disconnect state chaneg from Game Center?

In Xcode 10, there was a button for the Object Library located left of the "inspector" buttons. After the upgrade to Xcode 11 occurred, this button no logner exists. Where did it go?