PhoneCallObserver.swift

//
//  PhoneCallObserver.swift
//
//  Created by Paul Wilkinson on 27/9/17.
//  Copyright © 2017 Paul Wilkinson. All rights reserved.
//

import UIKit
import CallKit


class PhoneCallObserver: NSObject {
    
    static let sharedObserver = PhoneCallObserver()
    
    private let serialQueue = DispatchQueue(label: "my.ios10.call.status.queue")
    private let callObserver = CXCallObserver()
    
    private override init() {
        super.init()
        self.callObserver.setDelegate(self, queue: self.serialQueue)
    }

}

extension PhoneCallObserver: CXCallObserverDelegate {
    
    func callObserver(_ callObserver: CXCallObserver, callChanged call: CXCall) {
        
        let identifier = call.uuid.uuidString
        
        var state = ""
        
        if call.isOutgoing {
            state = "Outgoing "
        } else {
            state = "Incoming "
        }
        
        if call.isOnHold {
            state = state+"On hold "
        }
        
        if call.hasConnected {
            state = state+"Connected "
        } else {
            state = state+"Alerting "
        }
        
        if call.hasEnded {
            state = state+"Ended"
        }
        
        print("Call \(identifier) is now in state \(state)")
    }
}