Work With NSNotification Center In Swift Ios 

 
NSNotificationCenter.defaultCenter().addObserver(
    self,
    selector: "batteryLevelChanged:",
    name: UIDeviceBatteryLevelDidChangeNotification,
    object: nil)
 
 
@objc func batteryLevelChanged(notification: NSNotification){     
    //do stuff
} 




=========================================
Send(Post) 
NSNotificationCenter.defaultCenter().postNotificationName 
("NotificationIdentifier", object: nil)
 

Receive(Get) Notification 
 
NSNotificationCenter.defaultCenter().addObserver(self, selector: 
 "methodOfReceivedNotification:", name:"NotificationIdentifier", object: nil) 



Remove Notification






NSNotificationCenter.defaultCenter().removeObserver


 (self, name: "NotificationIdentifier", object: nil)
NSNotificationCenter.defaultCenter().removeObserver 


(self) // Remove from all notifications being observed


 


 

Method handler for received Notification




func methodOfReceivedNotification(notification: NSNotification){
    //Take Action on Notification
}


 

Annotate either the class or the target method with @objc


 


@objc private func methodOfReceivedNotification(notification: NSNotification){
    //Take Action on Notification
}

//Or

dynamic private func methodOfReceivedNotification(notification: NSNotification){
    //Take Action on Notification
}  























































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