A dive into the Observer Pattern in iOS applications

 

ios observer pattern

Thankfully, iOS has a built-in and well-known feature for enabling the observer pattern: NotificationCenter, which I’ll let you study up on yourself here. Use case for observer design pattern app. My observer example project, available on GitHub, showcases how this broadcast type communication works. Aug 07,  · Design Patterns on iOS using Swift – Part 1/2. Learn about common design patterns when building iOS apps, and how you can apply these patterns in your own apps, in this 2-part tutorial. Nov 06,  · Observer Pattern. The Observation concept is getting more and more popular, mostly thanks to ReactiveX (Rx). 👀 Now, if all you need is subscribing to network calls while having a functional programming style, without the need for Coroutines, maybe importing the Rx library isn’t the best option 🤔 But guess what: you can do it yourself, with no more than 💯 lines! 👍 (see for.


Design pattern in Swift - Observers


Design Patterns are part of Mobile Development for a while now and a revolution towards Quality Assurance is on. Such patterns have become a standard among the community, yet implementing an academic one might come with a price — complexity.

Because some Design Ios observer pattern solve very complex problems, they often result in a complicated implementation as well. So complex sometimes, that we tend to ios observer pattern heavy Third Party Frameworkseven for simple use cases.

In this series, we are going to implement 4 of the most popular Design Patterns in a lightweight manner, ios observer pattern. The Observation concept is getting more and more popular, mostly thanks to ReactiveX Rx. Simple so far, right? Moving on! The next element we need is the Request enum for the NetworkManager.

It needs to contain a urla method as well as parameters. Yaaaaaay, a fancy enum as we all love it! But have you noticed?

The enum Request is Hashable! Which leads us to a Dictionary with Requests as keys and Observers as values : we are of course talking about the observables! Looking good huh?! Looking now at the NetworkManagerits protocol is quite synthetic: observe a Request with an Observer or simply execute a Request. Nice and simple, all we want, is observe a Requestios observer pattern, with a given Observer and in case of a pull-to-refresh action, simply executes a Request to notify the subscribed Observer s!

And use this Manager in the ViewController to update the view accordingly! Looks good! Have you ever encountered something called DisposeBag in Rx? So, to dispose of an Observerwe first need to identify it, as so far it is simply stored in an array, remember?

How about having a Dictionary instead with unique identifiers as keys?! Now, an observable consists of a Requestwhich is observed by one ios observer pattern several Observer s. Each one of them, is uniquely identified with a UUID! Not so bad finally, it looks almost the same! We need to ios observer pattern a Disposableso ios observer pattern can dispose of an Observer. That was easy! From now on, disposing an observable from the ViewController is ridiculously simple!

And boom! Was it worth it? Did that help you understand what problems the Observer Pattern is trying to solve? Sign in. Get started. Jean Mainguy Follow. The time has come to combine quality and simplicity. Shall we?! Subscribe to a Request Looking now at the NetworkManagerits protocol is quite synthetic: observe a Request with an Observer or simply execute a Request, ios observer pattern. Dispose of an Observer So, to dispose of an Observerwe first need to identify it, as so far it is simply stored in an array, remember?

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Design Patterns on iOS using Swift – Part 1/2 | saluthis.gq

 

ios observer pattern

 

Nov 06,  · Observer Pattern. The Observation concept is getting more and more popular, mostly thanks to ReactiveX (Rx). 👀 Now, if all you need is subscribing to network calls while having a functional programming style, without the need for Coroutines, maybe importing the Rx library isn’t the best option 🤔 But guess what: you can do it yourself, with no more than 💯 lines! 👍 (see for. Aug 07,  · Welcome back to part two of this introductory tutorial on design patterns on iOS! In the first part, you learned about some fundamental patterns in Cocoa such as MVC, singletons, and decorator.. In this final part, you’ll learn about the other basic design patterns that come up a lot in iOS and OS X development: adapter, observer, and memento. A solution to this can be created by implementing the Observer Pattern. About the Observer Pattern. Observer is a behavioral design pattern. It specifies communication between objects: observable and observers. An observable is an object which notifies observers about the changes in its state.