Hamdouchi Interactive
  • Welcome
  • Mobile
  • Tech Blog
  • Let's Talk

Unlocking the Power of Swift:
A Tech Blog Series

Welcome to our tech blog series dedicated to exploring the world of Swift and its related topics. Our goal is to provide valuable insights and in-depth analysis on the latest advancements in the Swift programming language, including design patterns and data structures. Stay tuned for our upcoming articles and join the discussion on the exciting world of Swift programming!

Explore all Topics

Understanding and Implementing the Proxy Design Pattern

3/23/2023

0 Comments

 
Picture
The Proxy Design Pattern is a structural pattern that is commonly used in software engineering. This pattern is used to create a surrogate or placeholder object that acts as a representative for another object. The proxy object can provide additional functionality, such as lazy loading or caching, while still allowing the client to interact with the original object in the same way.

In Swift, the Proxy Design Pattern can be implemented by creating a class that acts as the proxy. This class should have the same interface as the original object, but it should also have the additional functionality that is needed. For example, if the original object is a heavy resource that takes a long time to load, the proxy class could provide a method for lazy loading the object only when it is needed.

Here is an example of how the Proxy Design Pattern can be implemented in Swift:

    
In this example, the Image protocol defines the interface for an image object. The RealImage class is an implementation of this interface that represents an actual image file on disk. The ImageProxy class is the proxy for RealImage, and it implements the same Image interface.

The ImageProxy class has a private realImage property that holds the instance of RealImage that it represents. This property is initialized as nil to represent the fact that the real image has not yet been loaded.

The display() method of ImageProxy checks if the realImage property is nil, and if it is, it creates an instance of RealImage and assigns it to the realImage property. This is the lazy loading functionality of the proxy, as it only loads the real image when it is needed. Once the real image is loaded, the display() method simply calls the display() method of the RealImage instance to display the image.

The ImageProxy class also has a imageName property that holds the name of the image file that it represents. This property is used to create the RealImage instance when it is needed.

This is just one example of how the Proxy Design Pattern can be implemented in Swift. The pattern can be adapted and extended to suit the specific needs of any project.
0 Comments
    Picture

    Mohamed Hamdouchi


    Author

    Lead iOS Engineer.
    I help develop Design System Libraries.
    Creative Thinker.
    Featured on the App Store with 4M+ downloads.


    Archives

    May 2023
    April 2023
    March 2023
    February 2023
    January 2023
    December 2022


    Categories

    All
    Abstract Factory
    Associatetype
    Behavioral
    Bridge
    Builder
    Chain Of Responsibility
    Class
    Command
    Composite
    Creational
    Decorator
    Design Pattern
    Facade
    Factory
    Factory Method
    Flyweight
    Interpreter
    Iterator
    Memento
    Observer
    Protocol
    Prototype
    Proxy
    Singleton
    State
    Strategy
    Struct
    Structural
    Swift

​​COPYRIGHT © 2009 HAMDOUCHI INTERACTIVE, LLC. ​ALL RIGHTS RESERVED
  • Welcome
  • Mobile
  • Tech Blog
  • Let's Talk