Get url schema programmatically in Swift 3.0

func getURLSchema() -> String?{

    guard let schemas = Bundle.main.object(forInfoDictionaryKey: "CFBundleURLTypes") as? [[String:Any]],
        let schema = schemas.first,
        let urlschema = schema["CFBundleURLName"] as? String
        else {return nil}

return urlschema 

}