Where to remove observer for NSNotification in Swift?

Question

Where should I remove the observer for NSNotification in Swift, since viewDidUnload and dealloc() are unavailable?

Answer 1

Swift provides a deinit method that is called on instances of classes before they are destroyed.

https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Deinitialization.html

Answer 2

Use below method which functions same as dealloc.

deinit {
    // Release all resources
    // perform the deinitialization
}

A deinitializer is called immediately before a class instance is deallocated. You write deinitializers with the deinit keyword, similar to how intializers are written with the init keyword. Deinitializers are only available on class types.

Swift Deinitializer

Answer 3

In Swift 4.2, this is one of the way you can remove observer

deinit {
    NotificationCenter.default.removeObserver(self, name: Notification.Name.Identifier, object: nil)
}

setup addObserver notification in viewDidLoad class

override func viewDidLoad() {
    super.viewDidLoad()
    NotificationCenter.default.addObserver(self, selector: #selector(didReceivedItemDetail), name: Notification.Name.Identifier, object: nil)
}