# Dependency Injection: Give Your iOS Code a Shot in the Arm

DevFeed: [Dependency Injection: Give Your iOS Code a Shot in the Arm](<https://devfeed.tech/articles/dependency-injection-give-your-ios-code-a-shot-in-the-arm-15598.md>)

Original publisher: [Read original article](<https://developer.squareup.com/blog/dependency-injection-give-your-ios-code-a-shot-in-the-arm>)

Author: Square Engineering

Published: 2015-06-05T16:09:00Z

Content type: tutorial

Language: en

Sources: [Square Corner Blog RSS Feed](<https://devfeed.tech/sources/square-corner-blog-rss-feed.md>)

Topics: [Dependency injection](<https://devfeed.tech/topics/dependency-injection.md>), [iOS](<https://devfeed.tech/topics/ios.md>), [Objective-C](<https://devfeed.tech/topics/objective-c.md>), [Swift](<https://devfeed.tech/topics/swift.md>)

Tags: [apply](<https://devfeed.tech/tags/apply.md>), [constructor](<https://devfeed.tech/tags/constructor.md>), [dependency-injection](<https://devfeed.tech/tags/dependency-injection.md>), [engineering](<https://devfeed.tech/tags/engineering.md>), [examples](<https://devfeed.tech/tags/examples.md>), [graph](<https://devfeed.tech/tags/graph.md>), [ios](<https://devfeed.tech/tags/ios.md>), [objective-c](<https://devfeed.tech/tags/objective-c.md>), [properties](<https://devfeed.tech/tags/properties.md>), [property](<https://devfeed.tech/tags/property.md>), [swift](<https://devfeed.tech/tags/swift.md>), [tests](<https://devfeed.tech/tags/tests.md>)

## AI overview

This tutorial introduces dependency injection for Objective-C codebases, explains constructor and setter injection, and notes that the concepts also apply to Swift. It describes benefits including explicit dependencies, composition, customization, ownership, and testability.

## Source excerpt

Applying the dependency injection design pattern to Objective-C or Swift codebases.