How to show an alert from another class in Swift?

Question

I have a main class, AddFriendsController, that runs the following line of code:

ErrorReporting.showMessage(\"Error\", msg: \"Could not add student          


        

Answer 1

Actually, in my opinion the view controller presenting operation should be done on the UIViewController instance, not in a model class.

A simple workaround for it is to pass the UIViewController instance as a parameter

class ErrorReporting {
    func showMessage(title: String, msg: String, `on` controller: UIViewController) {
        let alert = UIAlertController(title: title, message: msg, preferredStyle: UIAlertControllerStyle.Alert)
        alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler: nil))
        controller.presentViewController(alert, animated: true, completion: nil)
    }
}

And call it like below

ErrorReporting.showMessage("Error", msg: "Could not add student to storage.", on: self)