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Xicom | Software, Mobile Apps, Web Application Development

Xicom | Software, Mobile Apps, Web Application Development

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Complete Guide for iPhone App Developers On the Ins and Outs of iOS Design Patterns

Posted by Noman Cart on February 16 2018, 14:54pm

Categories: #Mobile App Development Company, #iOS Development, #apple, #iphone app, #appls, #Mobile App Developers, #iOS App Development Services, #ios application

Guide on Choosing the Right iOS Architectural Design Patterns
Guide on Choosing the Right iOS Architectural Design Patterns


A stable and reliable app is an output of a solid foundation that has to be taken care of in the very start of the iOS app development process. This responsibility falls on the iPhone app developers who should be experienced enough to take into consideration the significance of solid groundwork. It demands a little more time and extra efforts to brainstorm on the architectural design patterns.


Why pay attention to choosing correct architectural design pattern?
We can’t stress enough on the strong footing which will lead to the development of dynamic and top-notch apps for your clients resulting into more downloads and ultimately resulting in more revenue than ever before!
 It is a long chain of factors that are dependent on one another.  
So, let’s move on to know about the architectural design of the iOS patterns, the factors affecting the choice and more! Professional iPhone app developers should choose according to the requirements of the projects they are working on! The requirements of every iOS app is different according to the small, medium or large enterprises of the businesses and the companies.


Reduce the risk of bumping into errors and bugs afterward:
No two apps can have same requirements. So, one should make it a healthy practice to make precise decisions right from the start to see extraordinary outputs at the end. Without much further ado, let’s move on to discuss the types of architectural design patterns and the ins and outs of each one of it.  
The bugs and issues that will happen afterward can turn out to be nightmares for you. It means if you don’t want to get lost into the massive piles of codes, don’t throw caution to the winds beforehand.


Features of a befitting architecture are:
● It should be easy to maintain and easy to figure out in the first instance.
● A design pattern for iOS app development should allow measurability.
● An accurate design pattern for the app should allow testability.
● It is very important that the architecture whether its. MVC, MVVM or MVP, should allow for Balanced distribution among entities.


Factors emphasizing the choice of the iOS design patterns are:
1.Single Responsibility Thumb rule:
As we know it's always good, generically, to divide the things to lessen the burden on 1 person. Same happens here. Single responsibility on one class means robust a DNS dynamic functioning. This principle works the best when a class is meant to process one type of functioning and hence the functions are divided among entities ensuring balanced classes. 
2.Why care for testability?
We are not talking about testing here. It means that the architectural design pattern should be easy enough to create strategies around it. It is a strategy to write automated codes to test the application. So that the app is always ready to dive into independent testing as and when required. It should be test-able. iPhone app developers can easily escape from the hassle of finding and fixing bugs due to this.  
3.Why hassle-free use is a must-have feature?
More code writing means a developer is giving more room for the bugs and errors to happen and create issues for the developers to devote time in fixing the errors! Later heavy incurring on maintenance costs can be burdensome, so why not care of the same at the very start?

Let’s talk about the types of architectural design patterns in detail and their functions.  

Curious about knowing in detail about the above-mentioned design patterns for iOS app development, read on...

● Model-View-Controller (MVC):
MVC stands for Model-View-Controller- used basically for smaller applications as it is mostly suitable for that. Used for software applications development. Where will you find this design pattern most implemented? Cocoa apps and frameworks by the industry giant- Apple Inc.

What is a Model?
Business logic aka. Business model and data model are represented by Model which is actually a collection of different classes. We can also relate it with the rules responsible for modification and manipulation of data.

What is a View?
View is simply understanding what viewing on the screen is- GUI we can say! It is actually the User Interface which is responsible for what is presented on the iOS app screen. The app features and the data on the UI button is however retrieved by the Controller:

Let’s see what a controller is!

A perfect intermediater between the model and view. It makes the function of the view possible by retrieving the data on the action of the app user. Request of the user is processed by the Controller and the decision is made on how the data is to be presented on the UI of the app.  
The term used is actually UIViewController.  
It can lead to overload of requests, so this pattern is suitable for small sized apps only!  

Second design pattern for iPhone application development is:

● Model-View-Presenter (MVP):


Model in MVP - Model performs the same function as in MVC design. There’s no need to explain the same.  
View - A small difference here when we talk about the View term in MVP. In MVC, View is related to UIViewController but View in MVP relates to UIView as well as UIViewController. Any interaction of the user is interacted to the presenter instead of the Controller.
Presenter - In this iOS architectural design pattern, the controller is replaced by presenter. Presenter is responsible for retrieving the data and presenting it to the users on clicking on the UI button of the app. The responsibilities of showing the requested data lies with the presenter in MVP.

It does so by communicating to the model layer, updating the view as well as converting the data in a format that is UI-friendly.


● Model-View-View-Model (MVVM):

Fortunately, MVVM design pattern is an enhanced version of MVC, so it can be used for complex app development also. The difference is that in MVVM, there is a united function of the View and Controller but the presentation logic is here handled by ViewModel.

In a nutshell, it is extremely important to make a significant decision related to the architectural design patterns before starting with the process of iOS app development. MVC, MVP and MVVM are made to suit the varied requirements of the iOS apps.

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