Swift Package Manager: Native Dependency Management
Swift Package Manager (SPM) is Apple's built-in librarian for your project's code dependencies. You use it to add, remove, and update third-party libraries directly in Xcode. The main footgun is that version conflicts between dependencies can break your build.
WHY IT EXISTS Before Swift Package Manager (SPM), developers relied on third-party tools like CocoaPods and Carthage to manage external libraries. Apple created SPM to provide a first-party, officially supported, and deeply integrated way to handle dependencies, aiming to simplify project setup, reduce configuration overhead, and unify the ecosystem.
THE MENTAL MODEL Think of SPM as your project's dedicated librarian. You give it a list of books (libraries) you need, and it fetches them from their source (usually a Git repository), makes sure you have the right editions (versions), and handles any other books those books depend on. It's all managed through a simple manifest file or directly in the Xcode UI, no separate tools needed.
HOW IT WORKS SPM uses a Package.swift manifest file, written in Swift, to define a package's products, targets, and dependencies. When you add a package to an Xcode project, Xcode reads this manifest, resolves the entire dependency graph, and fetches the source code. It then compiles the code and links it against your app's target. Xcode's UI manages versioning rules, allowing you to specify exact versions, version ranges (e.g., up to the next major version), or specific branches.
WHEN TO USE IT Use SPM for nearly all modern Swift projects on Apple platforms. It's the standard for adding third-party libraries like Alamofire (networking) or Kingfisher (image caching). It's also excellent for modularizing a large application into smaller, independent internal packages to improve build times and code organization.
WHEN NOT TO USE IT Avoid SPM if your project has a deep, legacy dependency on CocoaPods and migration is too costly. Some older, unmaintained libraries may only be available through other managers. While SPM now supports binary dependencies (XCFrameworks), it may not work for projects that require older binary formats or complex pre-build scripting that other managers support.
ONE CANONICAL EXAMPLE To add the popular swift-algorithms library to your project, you navigate to File > Add Packages... in Xcode. You then paste the repository URL (https://github.com/apple/swift-algorithms.git) into the search bar. Xcode fetches the package manifest, and you can then choose a versioning rule and select which target in your project should include the new library. SPM handles the download and integration automatically.
Read the original → developer.apple.com
Get five bites like this every day.
Tezvyn delivers a daily feed of 60-second tech bites with quizzes to lock in what you learn.