#MODERN ARCHITECTURE PATTERNO CODE#
#MODERN ARCHITECTURE PATTERNO SIMULATOR#

#MODERN ARCHITECTURE PATTERNO CODE#

Ease of use - the least amount of code among others patterns.

Testability - due to the bad distribution youвЂ™ll probably only test your Model.

Distribution - the View and the Model in fact separated, but the View and the Controller are tightly coupled.

But letвЂ™s assess it in terms of features defined in the beginning of the article: With all that said, it might seems that Cocoa MVC is a pretty bad pattern to choose. The interactions between the View and the Controller arenвЂ™t really testable with Unit Tests iPad), so IвЂ™d recommend to remove вЂњHost ApplicationвЂќ from your Unit Test target configuration and run your tests without your application running on simulator. iPhone 4S) doesnвЂ™t guarantee that it would work fine on the other devices (e.g.

#MODERN ARCHITECTURE PATTERNO SIMULATOR#

In fact, loading and testing UIViews on one simulator (e.g. This doesnвЂ™t seem very testable, right? We can move generation of greeting into the new GreetingModel class and test it separately, but we canвЂ™t test any presentation logic (although there is not much of such logic in the example above) inside the GreetingViewController without calling the UIView related methods directly (viewDidLoad, didTapButton) which might cause loading all views, and this is bad for the unit testing. MVC assembling can be performed in the presenting view controller MVC How it used to beД«efore discussing AppleвЂ™s vision of MVC letвЂ™s have a look on the traditional one. LetвЂ™s start with MV(X) patterns and get back to VIPER later. reuse them (mostly applicable to the View and the Model).

understand them better (as we already know).

Controller/Presenter/ViewModel - the glue or the mediator between the Model and the View, in general responsible for altering the Model by reacting to the userвЂ™s actions performed on the View and updating the View with changes from the Model.

Views - responsible for the presentation layer ( GUI), for iOS environment think of everything starting with вЂ UIвЂ™ prefix.

Models - responsible for the domain data or a data access layer which manipulates the data, think of вЂ PersonвЂ™ or вЂ PersonDataProviderвЂ™ classes.

Nowadays we have many options when it comes to architecture design patterns:ДЇirst three of them assume putting the entities of the app into one of 3 categories: This means that desire to write less code should never be explained solely by laziness of a developer, and you should not favour a smarter solution closing your eyes to its maintenance cost. Therefore the less code you have, the less bugs you have. This does not require an answer but it is worth mentioning that the best code is the code that has never been written. This means the tests saved those developers from finding issues in runtime, which might happen when an app is on a userвЂ™s device and the fix takes a week to reach the user. This is usually not a question for those who already felt gratitude to unit tests, which failed after adding new features or due to refactoring some intricacies of the class. So the easiest way to defeat complexity is to divide responsibilities among multiple entities following the single responsibility principle. But this ability doesnвЂ™t scale linearly and reaches the cap very quickly. If you think the more you develop the better your brain will adapt to understanding complexity, then you are right.

Ease of use and a low maintenance cost.Дistribution keeps a fair load on our brain while we trying to figure out how things work.Testability usually comes from the first feature (and donвЂ™t worry: it is easy with appropriate architecture).Balanced distribution of responsibilities among entities with strict roles.LetвЂ™s define features of a good architecture: There is something wrong with the AppleвЂ™s MVC, but weвЂ™ll get back to it later. Your data stored directly in the UIViewControllerДЄnd this can happen, even despite the fact that you are following AppleвЂ™s guidelines and implementing AppleвЂ™s MVC pattern, so donвЂ™t feel bad.This class is the UIViewController subclass.If you are already in this situation with your application, it is very likely that:

Naturally, it is hard to keep this class in mind as whole entity, thus, youвЂ™ll always be missing some important details. Why care about choosing the architecture?Д«ecause if you donвЂ™t, one day, debugging a huge class with dozens different things, youвЂ™ll find yourself being unable to find and fix any bugs in your class.вЂќ.

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