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Dec 14th, 2017
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  1. import Foundation
  2.  
  3. extension NotificationCenter {
  4.  
  5. open func observeOnce(forName name: NSNotification.Name?, object obj: Any?, queue: OperationQueue?, using block: @escaping (Notification) -> Swift.Void) {
  6. var observer: NSObjectProtocol?
  7. observer = addObserver(forName: name, object: obj, queue: queue) { note in
  8. if let observer = observer {
  9. self.removeObserver(observer)
  10. }
  11. block(note)
  12. }
  13. }
  14. }
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