Implement an audio-only call

When starting a call, the Call Kit (ZegoUIKitPrebuiltCall) turns on the camera, and microphone, and uses the speaker as the audio output device by default.

To change this default configuration, for example, turn off the camera when you start a call, or don't use the speaker (If the speaker is not used, the system's default audio output device, such as ear speaker, headset, Bluetooth, etc., will be used.), you can modify the following configurations:

turnOnCameraWhenJoining: Whether to turn on the camera when the call starts. true: turn on (by default). false: turn off.
turnOnMicrophoneWhenJoining: Whether to turn on the microphone when the call starts. true: turn on (by default). false: turn off.
useSpeakerWhenJoining: Whether to use the speaker when the call starts. true: use the speaker (by default). false: use the system's default audio output device, such as an ear speaker, headset, Bluetooth, etc.

Here is the reference code:

Basic call

With call invitation

class ViewController: UIViewController {
    
    let selfUserID: String = "userID"
    let selfUserName: String = "userName"
    let yourAppID: UInt32 = YourAppID 
    let yourAppSign: String = YourAppSign
    let callID: String = "testCallID"
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    @IBAction func makeNewCall(_ sender: Any) {
        
        // Modify your custom configurations here.
        let config: ZegoUIKitPrebuiltCallConfig = ZegoUIKitPrebuiltCallConfig.oneOnOneVideoCall()

        config.turnOnCameraWhenJoining = false;
        config.turnOnMicrophoneWhenJoining = false;
        config.useSpeakerWhenJoining = true;

        let callVC = ZegoUIKitPrebuiltCallVC.init(yourAppID, appSign: yourAppSign, userID: selfUserID, userName: selfUserName ?? "", callID: callID, config: config)
        callVC.modalPresentationStyle = .fullScreen
        self.present(callVC, animated: true, completion: nil)
    }
}

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class CallInvitationVC: UIViewController {
    let appID: UInt32 = yourAppID
    let appSign: String = "yourAppSign"
    let userID: String = "userID"
    let userName: String = "userName"
    let voiceCallButton: ZegoSendCallInvitationButton = ZegoSendCallInvitationButton(ZegoInvitationType.voiceCall.rawValue)
    let videoCallButton: ZegoSendCallInvitationButton = ZegoSendCallInvitationButton(ZegoInvitationType.videoCall.rawValue)

    override func viewDidLoad() {
        super.viewDidLoad()
        let config = ZegoUIKitPrebuiltCallInvitationConfig([ZegoUIKitSignalingPlugin()], notifyWhenAppRunningInBackgroundOrQuit: false, isSandboxEnvironment: false)
        ZegoUIKitPrebuiltCallInvitationService.shared.initWithAppID(self.appID, appSign: self.appSign, userID: self.userID, userName: self.userName, config: config)
        ZegoUIKitPrebuiltCallInvitationService.shared.delegate = self
    }
}

extension CallInvitationVC: ZegoUIKitPrebuiltCallInvitationServiceDelegate {
    //MARK: -ZegoUIKitPrebuiltCallInvitationServiceDelegate
    func requireConfig(_ data: ZegoCallInvitationData) -> ZegoUIKitPrebuiltCallConfig {
        var config = ZegoUIKitPrebuiltCallConfig.groupVoiceCall()
        if data.type == .voiceCall {
            if data.invitees?.count ?? 0 > 1 {
                config = ZegoUIKitPrebuiltCallConfig.groupVoiceCall()
            } else {
                config = ZegoUIKitPrebuiltCallConfig.oneOnOneVoiceCall()
            }
        } else {
            if data.invitees?.count ?? 0 > 1 {
                config = ZegoUIKitPrebuiltCallConfig.groupVideoCall()
            } else {
                config = ZegoUIKitPrebuiltCallConfig.oneOnOneVideoCall()
            }
        }
        // Modify your custom configurations here.
        config.turnOnCameraWhenJoining = false;
        config.turnOnMicrophoneWhenJoining = false;
        config.useSpeakerWhenJoining = true;
        return config
    }
}

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