An iOS Quick Support screen represented using CleanSwift architecture

QuickSupportExample.swift

// Models File
// QuickSupportModels.swift

class QuickSupportModels {
...
  enum CallSupport {
    struct Request {
      var viewController: UIViewController?
      var supportPhoneNumber: String?
    }
    
    struct Response {
    }
    
    struct ViewModel {
    }
  }
...
}

// ViewController File
// QuickSupportViewController.swift

class QuickSupportViewController {
...
  func callCustomerService(for number: String)  {
    let alertTitle = Localiser.sharedInstance.string(for: "Quick Support.Call.Alert.Title")
    let alertDescription = Localiser.sharedInstance.string(for: "Quick Support.Call.Alert.Description")
    let alertYes = Localiser.sharedInstance.string(for: "Quick Support.Call.Alert.Yes")
    let alertNo = Localiser.sharedInstance.string(for: "Quick Support.Call.Alert.No")

    var alertButtonAndActions: [UIAlertButtonAndAction] = []
    alertButtonAndActions.append(UIAlertButtonAndAction(buttonLabel: alertNo, style: .cancel))
    alertButtonAndActions.append(UIAlertButtonAndAction(buttonLabel: alertYes, style: .ok) {
    let request = QuickSupportModels.CallSupport.Request(viewController: self, supportPhoneNumber: number)
    self.interactor?.callSupport(with: request)
    })
  }

  func displayCallSupportResult(with viewModel: QuickSupportModels.CallSupport.ViewModel) {
    // display whatever you want after you've called the Phone app to call the Support Phone Number
  }
...
}

// Interactor File
// QuickSupportInteractor.swift

class QuickSupportInteractor {
...
  func callSupport(with request: QuickSupportModels.CallSupport.Request) {
    worker = QuickSupportWorker(viewController: request.viewController!)
    worker?.callSupport(number: request.supportPhoneNumber!, completionHandler: {
      let response = QuickSupportModels.CallSupport.Response()  
      self.presenter?.presentCallSupportResult(with: response)      
    })
  }
...
}


// Worker File
// QuickSupportWorker.swift

class QuickSupportWorker {
...
  func callSupport(number: String, completionHandler: @escaping () -> Void) {     
    if let phoneCallURL:NSURL = NSURL(string: "tel://\(number)") {
      let application:UIApplication = UIApplication.shared
      if (application.canOpenURL(phoneCallURL as URL)) {
        application.openURL(phoneCallURL as URL);
      }
    }
    
    completionHandler()
  }
...
}

// Presenter File
// QuickSupportPresenter.swift

class QuickSupportPresenter {
  func presentCallSupportResult(with response: QuickSupportModels.CallSupport.Response) {
    let viewModel = QuickSupportModels.CallSupport.ViewModel()
    viewController?.displayCallSupportResult(with: viewModel)
  }
}