Top Design Patterns Used in Swift for developing iOS Apps – Appventurez

iOS design patterns- quite a known term in the world of world app development but an overrated too. Many iOS developers do believe in the concept of Swift design patterns, but unavailability of explained chapters, articles related to design patterns make it challenging for developers to know about them.

Meanwhile, there are some developers who definitely pay attention to design patterns while writing codes like ours in Appventurez. 

We, the topmost mobile app development company understand the importance of iOS design patterns. They are patterns that can be reused for common problems in software design. There are templates that are specially designed to help developers write code for further reuse purposes. 

These design patterns can be further used for creating loosely coupled code for replacing components in the code without juggling much. 

Here in this blog, we will be discovering a lot about Swift design patterns, the methods used for developing iOS applications. 

Before getting started, a quick look at why businesses should develop the next iOS app development using Swift can make you understand the robustness and power of Swift for iOS. 

Once done with it, you are ready to explore the core of iOS app development.

Let us now begin with the advantages of design patterns for iOS.

What are the advantages of Design Patterns Swift for iOS App Development?

  1. Quite similar vocabulary

It is a belief that for every challenging situation, the need for complex solutions is mandatory. Well, this is not the situation when it comes to swift design patterns for iOS apps. 

As per Flutter vs Swift comparison, the latter one demands no mandated need for complex solutions to overcome the challenges of design issues. Just by stating the design pattern in Swift, designers can still gain an idea about the design pattern. Simply stating can let them understand how to resolve the issue or get started with the one!

2. The unification of code

 design pattern in Swift is important for figuring out solutions for bud detection or eradication. Here, Swift design patterns’ code unification acts as a helping agent in extracting mistakes, bugs, errors while coding, or structuring the application. 

A comparison between Kotlin vs Swift showcases the latter one eradicates mistakes prior minimizes any sort of app-related glitches, bugs, or errors. 

3. Solutions

Pre-designed Swift design patterns are already refined and eradicated from bugs and errors. And this is the reason they are smart and innovative. The pre-designed swift architecture patterns will then help in aiding new problems too. 

Hence, instead of redesigning or reinventing the process and making them error-free, these Swift design patterns can be reused for saving time and more effectiveness. 

These Swift design patterns are now categorized into 3 for smoother ios app development process. 

Swift Design Patterns Categories for iOS App Development

  1. Creational

One of the first swift design patterns categories for iOS app development is creational design patterns. 

Creational swift architecture patterns are meant for creating object mechanisms. The mechanism then provides concrete evidence in favor of the object. Evidence in favor then becomes suitable for a specific condition. 

There are different types of creational design patterns in Swift available like Factory, Abstract, Singleton, Builder, etc. 

2. Structural

Structural as the name suggests is the task of simplifying the app designing process while finding the easiest method for correlating objects and classes. 

It comes up with several methods like Facade, Adapter, MVC, and Bridge, Decorator, etc.

Check out- how much does it cost to develop an iOS app

3. Behavioral

The communication pattern between units and the integration of patterns are gained through behavioral design patterns Swift. 

Behavioral design patterns Swift is a set of methods like Template Method, Observer, Momento, Command, and others.

All the 3 categories of software design patterns do carry some of their important methods, forms, and examples which we haven’t explained in the category itself. 

So the following scrolls will be explaining them all in detail. 

Swift Design Patterns Methods for iOS Apps

  1. Model-View-Controller

Model View Controller also called MVC is one of the most used app architecture ios application design patterns in swift among others. It simply classifies objects as per the requirements in the iOS application and ensures clean code separation against the role. 

The 3 role that accompanies the mechanism is- 

Model is the first part of MVC that holds the application data and then defines how to manipulate it. 

The second part of MVC is the object in- charge of the visual representation of the Model and controls user interaction with it. 

The third and the last part of the MVC controller is the mediator between all the work. The controller accesses all the data from the model and then displays data with a view, manipulates it whenever required. 

The overall communication between M-V-C is given below- 

mvc architecture pattern


Swift design patterns MVVM is one of the favorites among the iOS developers’ community. The View in MVVM consists of visual elements like animation, UI components, layout, etc. 

Check out- Top mobile app UI design trends for the upcoming year.

Furthermore, the layer between the View and the Model called ViewModel represents the view in a canonical way. Hence, the ViewModel thus provides a set of interfaces and each interface then represents UI components in the view. 

The Swift design patterns MVVM version thus helps when it comes to swift for developing iOS design patterns applications. The expert developers know the difference of when to use MVC or MVVM as per the requirement. 

Get a look also at- An Introduction To MVVM Architecture In Flutter

3. Builder

Builder is used when there is a need to develop complex objects from the simpler ones step by step. By using the same code, developers can create different object views. 

For instance- a complex object demands incremental initialization of nested objects and multiple fields. In such a situation, the initialization code might be hidden inside a mammoth constructor with parameters. Or chances are that the codes might be scattered over the client code. 

Now, to give a cure that too quick, the Builder design pattern separates the construction of an object from its own class.

The construction of objects are instead assigned to the builder and then divided into multiple steps.  

There are a few steps that might help you when applying design pattern- 

  • When avoiding telescopic constructor.
  • When code is required to create many views of a specific object.
  • When there is a need for composing complex objects.

4. Facade

Another representative of the iOS app design pattern Facade offers a simplified interface for complex systems. Irrespective of its numerous methods with different interfaces, developers can create their own class to provide a simplified interface. 

The facade is also useful when decomposing subsystems into different layers. 

api system

The design pattern is considered ideal for working with various classes, especially the complicated ones!

5. Singleton

The Singleton design pattern is all about one instance for a given class with global accessibility. It uses lazy loading for creating a single instance when required for the first time. 

Now you might be thinking what is the use of a single instance!

Well, there are chances and cases in which only makes sense with one instance of a class. Take for example- there is one instance required for iOS application and one main screen. In this case, you will be opting for a single instance only 

Also, via a single instance, it is easy to implement thread-safe access shared resources like a configuration file. 

6. Memento

The Memento pattern saves the data somewhere. Later, the externalized state can be restored without encapsulation violation. 

Encapsulation means that private data will remain private with no threat of theft or loss. A few implementation examples of the Memento pattern is- Archiving, Serialization, and State Restoration.

7. Observer

The next design pattern called Observer defines a one-to-many dependency among objects. The dependency here means that when one object changes state, its related dependents will be notified and updated, automatically. 

An observer design pattern is also called Publish and subscribe model where the subjects and observers are coupled loosely. 

Here the communication takes place between observing and observed objects while eliminating the need to know about each other. 

Cocoa uses the observer pattern through Key-Value Observing (KVO) and notifications. 

8. Strategy

Strategy, the next swift architecture patterns for developing iOS apps allows developers to change the algorithm behavior at run time. 

With the help of interfaces, one can define the family of algorithms while encapsulating and making them interchangeable. The practice allows one to select an algorithm for executing them at run time. 

9. Command

Command design pattern encapsulates requests in the form of objects and allows developers to describe or represent clients with several requests, log requests, queue, and support operations. 

These requested objects then bind together into one or more actions on a specific receiver. Moving on, the command design pattern separates an object from making a request from another object for receiving or executing purposes. 

10. Factory

For removing and adding new types of the codebase, the Factory method pattern gives smooth flexibility. 

In order to add a new type, developers require a new type of class along with a new factory for producing codes. 

11. Composite

Part of Model-View-Controller, the composite design pattern composes objects into a tree structure form for representing hierarchies. 

The tree-like structure helps clients to treat individual objects and compositions of objects uniformly. 

12. Iterator

The next Iterator swift architecture patterns give access to the elements of an aggregate object without exposing underlying representation. 

Iterator pattern here transfers the responsibility of accessing and traversing the elements from the collection to an iterator object. Here, the iterator defines an interface for accessing the collection of elements and further keeping track of the current element. 

13. Mediator

How a group of objects interacts is what the Mediator design pattern defines. The pattern promotes loose coupling by keeping objecting from referring to each other. 

Thus, it lets developers see the interaction between them independently. Furthermore, these objects remain reusable for other requirements. 

The mediator object also centralized complex communication along with controlling the logic between objects in the system. As a result, these mediator objects then provide information about when the object changes while responding to the requests. 

14. Proxy

Works as a surrogate or placeholder, another design pattern used in swift for developing an iOS app is Proxy. It controls access over objects as placeholders or surrogates. 

Developers can use Proxy design patterns in Swift for creating a proxy or representative of another object in order to gain access to another object. These objects further can be expensive, remove or require a secure network. 

Though the pattern of Proxy design patterns in Swift is somewhat similar to decorator pattern but serves a very different purpose- proxy controls access to an object whereas decorator adds behavior to any object. 

15. MVP

MVP or Model View Presenter is a three-component design pattern- the Presenter (UIKit independent mediator), the Passive View (UIView and/or UIViewController), and the Model. 

There is another MVP method used for mobile applications with limited and core features in order to track what is being liked or disliked by users. 

Meanwhile, here the MVP patterns for iOS define Views as Recipients of the UI events calling the suitable presenter when required. The presenters are meant for updating the View with fresh data returned by the Model. Also, the role of the presenter is meant for binding the model to the view. Furthermore, View is coupled loosely to the model. 

16. Decorator design

Without modifying the code, the next design patterns in swift called the Decorator pattern adds behaviors and responsibilities to any object. 

It is seen as an alternative to subclassing for modifying the class’s behavior by wrapping the whole with another object. 

17. Delegation

Delegate Swift design patterns for iOS apps is meant for keeping implementation-specific behavior away from the generic class. 

18. Adaptor

The adapter design pattern required for developing the iOS design pattern app converts the class interface into another interface as per the client requirements. 

This adaptor allows classes to work together while decoupling the client from the class of the object targeted. 

Apple’s app store rules are a little different and this is the reason, the tech giant uses protocols for work using Adapter. 

19. Template

The template design pattern in Swift defines the overall skeleton of the operational algorithm. Once done, the template method pattern then redefines the steps of an algorithm without making any change into the algorithm’s structure. 

Apps made from Swift Design Principles for Developing iOS

ios app development using swift


The iOS apps made through Swift design patterns are in demand due to numerous reasons like robustness, popularity, community size, and much more. And this is the reason why organizations and startups are turning towards Swift for iOS app development projects. 

If you are still in doubt, reach our experts to know more!

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