[Show simple UIAlerts from any VC] #ios #swift

alert.swift

extension UIViewController {
    func showAlert(withTitle title: String, message : String, withActions actions:[UIAlertAction] = [], withCompletion c:(()->())?=nil) {
        let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)

        if actions.isEmpty{ // default ok action
            let defaultAction = UIAlertAction(title: "Ok", style: .default)
            alertController.addAction(defaultAction)
        }

        for action in actions{
            alertController.addAction(action)
        }

        self.present(alertController, animated: true, completion: c)
    }
}

// use it like this:
// show a simple message with an ok action that just dismisses the alert
showAlert(withTitle: "Error", message: "Unable to do stuff.")


// add an action (pop the VC)
let backAction = UIAlertAction(title: "Ok", style: .default) { (action) in
	self.navigationController?.popViewController(animated: true)
    }
showAlert(withTitle: "Error", message: "Unable to do stuff, please return and try again.", withActions: [backAction])