NotificationCenter
public extension NotificationCenter
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SwifterSwift: Adds a one-time entry to the notification center’s dispatch table that includes a notification queue and a block to add to the queue, and an optional notification name and sender.
Declaration
Swift
func observeOnce(forName name: NSNotification.Name?, object obj: Any? = nil, queue: OperationQueue? = nil, using block: @escaping (_ notification: Notification) -> Void)
Parameters
name
The name of the notification for which to register the observer; that is, only notifications with this name are used to add the block to the operation queue.
obj
The object whose notifications the observer wants to receive; that is, only notifications sent by this sender are delivered to the observer.
queue
The operation queue to which block should be added.
block
The block to be executed when the notification is received.
notification
The notification.