How to encapsulate an UIViewController (like UIAlertController) in Swift? - ios

Question

I have a ViewController in my Storyboard which works like an alert (with a title, a message, and two buttons).
I would like to encapsulate it to be able to use it anywhere in my code, like this :
let alert = CustomAlertViewController(title: "Test", message: "message de test.", view: self.view, delegate: self)
self.present(alert, animated: false, completion: nil)
My problem is that the IBOutlets are not initialised...
My CustomAlertViewController :
public protocol CustomAlertProtocol {
func alertAccepted()
}
class CustomAlertViewController: UIViewController {
var delegate :CustomAlertProtocol? = nil
var parentView :UIView?
var blurScreenshot :SABlurImageView?
var alertTitle :String? = nil
var alertMessage :String? = nil
#IBOutlet weak var oAlertView: UIView!
#IBOutlet weak var oAlertTitle: UILabel!
#IBOutlet weak var oAlertMessage: UILabel!
//MARK: - Main
public convenience init(title: String?, message: String?, view: UIView, delegate: CustomAlertProtocol) {
self.init()
self.alertTitle = title
self.alertMessage = message
self.delegate = delegate
self.parentView = view
}
override func viewDidLoad() {
oAlertTitle.text = self.alertTitle
oAlertMessage.text = self.alertMessage
}
#IBAction func onAcceptButtonPressed(_ sender: AnyObject) {
delegate?.alertAccepted()
}
}

Answer 1

Set the Custom Class property of your View Controller to CustomAlertViewController
and Storyboard ID to whatever you want - e.g. CustomAlertViewControllerIdentifier in the Identity Inspector of the InterfaceBuilder.
And then instantiate it like following:
let storyboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
guard let vc = storyboard.instantiateViewControllerWithIdentifier("CustomAlertViewControllerIdentifier") as? CustomAlertViewController else {
return
}
edit:
You can then put that code in a class function like:
extension CustomAlertViewController {
class func instantiateFromStoryboard(title: String?, message: String?, view: UIView, delegate: CustomAlertProtocol) -> CustomAlertViewController {
let storyboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
let vc = storyboard.instantiateViewControllerWithIdentifier("CustomAlertViewControllerIdentifier") as! CustomAlertViewController
vc.title = title
vc.message = message
vc.view = view
vc.delegate = delegate
return vc
}
}
and then use like:
let myCustomAlertViewController = CustomAlertViewController.instantiateFromStoryboard(title: "bla", ...)