Allows using Cordova plugins for iOS written in the Swift language.

The following should be added to the extensibility configurations of the main module of your application (the one set as "Home"). Replace the value by your desired language version:

{
    "preferences": {
        "ios": [
            {
                "name": "UseSwiftLanguageVersion",
                "value": "4"
            }
        ]
    }
}