How to mock classes of external framework with delegates in iOS?

I am working in an iOS application called ConnectApp and I am using a framework called Connector. Now, Connector framework completes actual connection task with BLE devices and let my caller app (i.e. ConnectApp) know the connection request results through ConnectionDelegate. Let's see example code,

ConnectApp - host app

class ConnectionService: ConnectionDelegate {

    func connect(){
        var connector = Connector()
        connector.setDelegate(self)
        connector.connect()
    }

    func onConnected(result: ConnectionResult) {
        //connection result
    }
}

Connector Framework

public class ConnectionResult {
    // many complicated custom variables
}

public protocol ConnectionDelegate {
      func onConnected(result: ConnectionResult)
}

public class Connector {

   var delegate: ConnectionDelegate?

   func setDelegate(delegate: ConnectionDelegate) {
       self.delegate = delegate
   }

   func connect() {
        //…..
        // result = prepared from framework
        delegate?.onConnected(result)
   }
}

Problem

Sometimes developers have no BLE device and we need to mock the Connector layer of framework. In case of simple classes (i.e. with simpler methods) we could have used inheritance and mock the Connector with a MockConnector which might override the lower tasks and return status from MockConnector class. But when I need to deal with a ConnectionDelegate which returns complicated object. How can I resolve this issue?

Note that framework does not provide interfaces of the classes rather we need to find way around for concrete objects like, Connector, ConnectionDelegate etc.