B4i v3.60 adds support for libraries written in Swift and compiled as frameworks. This is an important feature as many (probably most) of the new open source projects are written in Swift. The B4i wrapper is written in Objective C. You can see an example here: https://github.com/AnywhereSoftware/B4i_iSwiftyButton (note the ~dependson attribute). Using a Swift library is not different than using an Objective C library. There are however a couple nuances that you should be familiar with: 1. The minimum supported iOS version is 8. You need to add: Code: #MinVersion: 8 2. Swift runtime libraries - All applications with Swift code depend on Swift runtime libraries. They are added automatically during compilation. The runtime size is about 8mb. Note that the size of the ipa file, when you compile with a store provision profile in release mode, will be about 35mb. Still the app size when installed on the device will be around 8mb. Example of B4i app with Swift library: https://itunes.apple.com/us/app/b4i-coordinates-calculator/id915366768?mt=8 3. Simulator not supported for now.