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Using CallKit with SwiftUI 👩🏿‍💻

Hey there! Are you looking to add phone call functionality to your SwiftUI app using CallKit? You’re in luck because we’re going to show you how to do just that!


What is CallKit? 📞


CallKit is a framework provided by Apple that allows developers to add phone call capabilities to their apps. With CallKit, you can make and receive phone calls within your app just like you would with the regular phone app.


Using CallKit with SwiftUI 🤙


To use CallKit with SwiftUI, we need to create a custom SwiftUI view that integrates with CallKit. Let’s break down the steps:

  1. Import the CallKit framework at the top of your SwiftUI file:

import CallKit

2. Create a custom SwiftUI view that conforms to the UIViewRepresentable protocol. This view will contain the code for making and receiving phone calls:

struct PhoneCallView: UIViewRepresentable {
    let callController = CXCallController()
    let callObserver = CXCallObserver()

    func makeUIView(context: Context) -> UIView {
        // Create and return a blank UIView
        return UIView()
    }

    func updateUIView(_ uiView: UIView, context: Context) {
        // Not needed for this view
    }

    func makeCall() {
        let handle = CXHandle(type: .phoneNumber, value: "123-456-7890")
        let startCallAction = CXStartCallAction(call: UUID(), handle: handle)
        callController.requestTransaction(with: startCallAction)
    }

    func endCall() {
        let endCallAction = CXEndCallAction(call: UUID())
        callController.requestTransaction(with: endCallAction)
    }

    func answerCall() {
        let answerCallAction = CXAnswerCallAction(call: UUID())
        callController.requestTransaction(with: answerCallAction)
    }

    func declineCall() {
        let endCallAction = CXEndCallAction(call: UUID())
        callController.requestTransaction(with: endCallAction)
    }

    func startObserving() {
        callObserver.setDelegate(self, queue: nil)
    }
}

extension PhoneCallView: CXCallObserverDelegate {
    func callObserver(_ callObserver: CXCallObserver, callChanged call: CXCall) {
        if call.hasEnded {
            // Do something when the call ends
        } else if call.isOutgoing {
            // Do something when the call is outgoing
        } else if call.hasConnected {
            // Do something when the call has connected
        } else if call.isOnHold {
            // Do something when the call is on hold
        } else {
            // Do something else
        }
    }
}

3. Use the custom view in your SwiftUI app to make and receive phone calls:

struct ContentView: View {
    let phoneCallView = PhoneCallView()

    var body: some View {
        VStack {
            Button(action: {
                self.phoneCallView.makeCall()
            }) {
                Text("Make Call")
            }
            Button(action: {
                self.phoneCallView.endCall()
            }) {
                Text("End Call")
            }
        }.onAppear {
            self.phoneCallView.startObserving()
        }
    }
}

And that’s it! With just a few lines of code, you now have a custom SwiftUI view that integrates with CallKit to make and receive phone calls.


Conclusion 🎉


Congratulations! You now know how to use CallKit with SwiftUI to add phone call functionality to your app. With just a little bit of custom code, you can take your SwiftUI app to the next level and make it even more useful for your users.


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