Project permissions

As you'll be using the microphone when making a call, you need to request the permission to use it.

Every Xcode project contains an Info.plist file containing all the metadata required in each app or bundle. If you click on the VonageTutorialApp target, then select info you will see the file.

A new entry in the Info.plist file is required:

1. Hover your mouse over the last entry in the list and click the little + button that appears.

2. From the dropdown list, pick Privacy - Microphone Usage Description and add Microphone access required in order to make and receive audio calls. for its value.

Your Info.plist should look like this:

Request permission on application start

Open AppDelegate.swift and import the AVFoundation library right after where UIKit is included.

import UIKit
import AVFoundation

Next, call requestRecordPermission: inside application:didFinishLaunchingWithOptions::

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    AVAudioSession.sharedInstance().requestRecordPermission { granted in
        print("Allow microphone use. Response: ", granted)
    }
    return true
}

Build and Run

You can now build and run the project, by either selecting Product > Run from the top menu, or pressing Cmd + R, and launch it in the simulator.

Notice the prompt asking for permission to use the microphone: