October 2017
Intermediate to advanced
210 pages
5h 32m
English
Content preview from Swift 4 Protocol-Oriented Programming - Third Edition
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The observer pattern
The observer pattern is used to implement distributed event handling where an observer type is notified when an event occurs within another type. The observer pattern allows groups of objects to cooperate with one another with few dependencies between them. This pattern is so widely used that you have probably come across it many times if you have developed applications using any modern UI framework such as Cocoa or Cocoa Touch.
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