How to create a reusable UIAlert ActionSheet as an UIViewController extension?

Question

I would like to create an action sheet that can be used several time in my code. To do so, I need to be able to use functions according to the action sheet title. Is there a way to pass functions as a parameter array like the "title" parameter?

//MARK: - UIAlert action sheet title
enum ActionSheetLabel: String {
  case camera = "Camera"
  case photoLibrary = "Album"
  case cancel = "Cancel"
}



class CameraHandler {
static let cameraHandler = CameraHandler()
func openCamera() { }
func openPhotoLibrary() { }
}


//MARK: - Alert that shows an action sheet with cancel
extension UIViewController {
  func showActionSheetWithCancel(vc: UIViewController, title: [ActionSheetLabel] /*Make a function parameter here to match title*/) {
    let actionSheet = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)

for value in title {
  actionSheet.addAction(UIAlertAction(title: value.rawValue, style: .default, handler: {
    (alert: UIAlertAction!) -> Void in

    //Use the parameter function here to match title

  }))
}

actionSheet.addAction(UIAlertAction(title: ActionSheetLabel.cancel.rawValue, style: .cancel, handler: nil))
vc.present(actionSheet, animated: true, completion: nil)
  }
}

Answer 1

I have find out the best way to add an action sheet with cancel and as much action as needed.

Create an UIViewController extension with type alias:

//MARK: - Alert that shows an action sheet with cancel 
extension UIViewController {
  typealias AlertAction = () -> ()
  typealias AlertButtonAction = (ActionSheetLabel, AlertAction)

  func showActionSheetWithCancel(titleAndAction: [AlertButtonAction]) {
    let actionSheet = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)

for value in titleAndAction {
  actionSheet.addAction(UIAlertAction(title: value.0.rawValue, style: .default, handler: {
  (alert: UIAlertAction!) -> Void in

    value.1()

}))
}
actionSheet.addAction(UIAlertAction(title: ActionSheetLabel.cancel.rawValue, style: .cancel, handler: nil))
self.present(actionSheet, animated: true, completion: nil)
  }
}

Then, in the class or other place where you want to use it, add the method this way:

//MARK: - UIAlert action sheet title
enum ActionSheetLabel: String {
  case camera = "Camera"
  case photoLibrary = "Album"
  case cancel = "Cancel"
}

//MARK: - Class example where to use the action sheet action
class CameraHandler {

fileprivate let currentVC: UIViewController!

func openCamera() { 
// Open user camera
}
func openPhotoLibrary() { 
// Open user photo library
}

  // Method example of this action sheet
  func showActionSheetWithCameraAndLibrary(vc: UIViewController) {

    //This is the way to use the extension
    vc.showActionSheetWithCancel(titleAndAction: [
      (ActionSheetLabel.camera, { [weak self] in self?.openCamera() }),
      (ActionSheetLabel.photoLibrary, { [weak self] in self?.openPhotoLibrary() })
      ])
  }
}