AdditionalSDK.swift

// AdditionalSDK
@objc public class PrimeNumberChecker: NSObject {
    @objc public var delegate: PrimeNumberCheckerDelegate?
  
    @objc public func inspect(number: Int) {
      // ...
    }
}

@objc public protocol PrimeNumberCheckerDelegate {
    func didFinishInspecting(number: Int, isPrime: Bool)
}