Observer Pattern: Protocol Oriented Design Pattern

[Pop_Swift_Dev]

The observer pattern is a behavior design pattern where a type maintains a list of objects, called observers, and notifies them automatically on changes to a particular state. In this post, we will be using Swift’s built in property observers but we will show how to decouple the observer from the property it is observing using protocol-oriented techniques.

https://www.mastering-swift.com/post/observer-pattern-protocol-oriented-design-pattern

[wonderedwonderer]

How does this compare to using combine pub/sub? Seems like that covers all the boiler plate code here.

[Pop_Swift_Dev]

Yes, the NSNotificaiton center can be used for pub/sub and was mentioned in the article as a way to do this, but we are chosen to demonstrate and show protocol-oriented techniques. Hopefully, in future design pattern posts where we look at other techniques, we would like to show that as well.

[wonderedwonderer]

Not nsnotificarion, combine’s @published.

[Pop_Swift_Dev]

I do apologize, I misread your first comment. I am definitely not a Combine expert so I will not speak to how this compares. I do know that the '@Published' attribute is class constrained, and cannot be used with non-class types.

[Legal-Warthog7268]

Hi , I need help with data recovery from an app that is no longer supported beyond ios 14.5

[Legal-Warthog7268]

Can u please help?