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Learn how to easily integrate a `Swift package` into your Objective-C project by following these clear steps and practical tips.
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Making Your Swift Package Usable in an Objective-C Project

Integrating a Swift package into an Objective-C project can be a challenging endeavor, especially for developers who are more accustomed to either language separately. The question arises: How can a package that's written purely in Swift be made usable in an Objective-C context?

If you're in this situation, don't worry—while the documentation might lack detail, I've found a straightforward way to achieve this. Let's break down the process into manageable steps.

Understanding the Basics

Before diving into the solution, let's summarize a few essential prerequisites:

Swift Class Requirements: A Swift class must inherit from NSObject to be usable within Objective-C.

Bridging with @ objc: You’ll need to utilize the @ objc keyword to expose Swift functionality to Objective-C.

Step-by-Step Guide to Export Your Swift Package

Step 1: Inherit from NSObject

First, you need to ensure that your Swift class inherits from NSObject. Here's an example:

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Step 2: Use the @ objc Keyword

To facilitate the interoperability between Swift and Objective-C, append the @ objc keyword to your class. You can also specify a more suitable name for the Objective-C context, which can simplify things for users of your library:

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Step 3: Export Functions

Next, you’ll want to add the functions necessary for your users to utilize. Be sure to prefix these functions with @ objc to make them accessible from Objective-C code. Here’s an example where we're wrapping a Swift class called MyLibrary:

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Step 4: Import and Use in Objective-C

Once your Swift package is properly configured, you can utilize it directly in your Objective-C code. Simply import your package as you would with any Swift package:

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Important Considerations

It's worth noting a couple of things to keep in mind:

Function Naming: The first parameter's function signature does not require the prefix "with". For instance, doSomethingElse becomes doSomethingElseWithID in Objective-C.

Xcode Updates: If you encounter issues after updating your Swift library, you may need to restart Xcode and clear your DerivedData folder to regenerate the bridging header with the updated code.

Conclusion

While the path to making a Swift package usable in an Objective-C project might not be perfectly documented, it is certainly achievable. By following the structured steps outlined in this post, you can harness the potential of your Swift packages within Objective-C applications.

Keep experimenting with these methods, and feel free to share your experiences or findings as you continue down this integration path!