I'm crashing and getting an unrecognized selector error every time a Notification arrives and the App tries to execute its …
swift nsnotificationcenter xcode9 addobserverLooking at various Apple examples (for example Add Music) in which I see they add observers to the default NSNotificationCenter …
objective-c ios dealloc nsnotificationcenter addobserverIs it possible to add observers to simple variables such as BOOLs or NSIntegers and see when they change? Thanks!
iphone objective-c addobserver