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I want to remove a notification observer and I am using the method:
[[NSNotificationCenter defaultCenter] removeObserver: name:@"myNotification" object:nil]; for this. Now there are many observers who are listening to this notification and I want to remove all of them in one shot from a centralised place. Can I pass 'nil' in first parameter and it will remove all observers who are listening to myNotification?
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Removing registered observer For Selector approach, use NotificationCenter. default. removeObserver(self, name: notificationName , object: nil) , to remove the observer. For Block based approach, save the token you obtained by registering for notification in a property.
Removing the observer stops it from receiving notifications. If you used addObserverForName:object:queue:usingBlock: to create your observer, you should call this method or removeObserver:name:object: before the system deallocates any object that addObserverForName:object:queue:usingBlock: specifies.
If your app targets iOS 9.0 and later or macOS 10.11 and later, and you used addObserver(_:selector:name:object:) , you do not need to unregister the observer. If you forget or are unable to remove the observer, the system cleans up the next time it would have posted to it.
addObserver(self, — This is for the class where we are going to observer notification. selector: #selector(loginSuccess) — This is the method name, whenever notification will receive this method call. name: NSNotification.Name(“com.
You can remove an object from the notification center all together which means no notifications will get triggered. For example, when I have a view controller that has registered for notifications, I include this line in my dealloc.
[[NSNotificationCenter defaultCenter] removeObserver:self]; This is at the object level...so it will unregister for many notifications. It won't unregister for one notification in many objects.
Hope I understood your question correctly.
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In case of Swift, you doing it like this:
NSNotificationCenter.defaultCenter().removeObserver(self) And in Swift 3:
NotificationCenter.default.removeObserver(self) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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