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The whole point of Swift is to be next generation Objective-C and C on Apple platforms, no need to drop down to other languages.

In fact, the prof of concepts shown in the article are all written in Swift.

I wasn't clear. It is dynamically constructing an API call that Objective-C allows. The objc_msgSend stuff.

Which you can call directly from Swift.

You are right.

Look at the code of gamed exploit that I've uploaded to GitHub, the app is written in Swift and it calls Objective-C runtime functions from it