We see how to substitute the old UIAlertView, deprecated in iOS9.
There was changes in iOS8, to make the interfaces more adaptive.
Therefore in the new adaptive world of iOS 8 the UIAlertController is a replacement for both UIAlertView and UIActionSheet. Switching between an alert or action sheet is done by setting the preferred style when creating the controller.

For example we consider a message with the OK button. The old code was like this:

func showSendMailErrorAlert() {
// Old and deprecated

let sendMailErrorAlert = UIAlertView(title: “some title”, message: “some message”, delegate: self, cancelButtonTitle: “OK”)

sendMailErrorAlert.show()
  }

After that I substituted the code with this new code:
func showSendMailErrorAlert() {
let alertController = UIAlertController(title: “some title”, message: “Some message.”, preferredStyle: .alert)
let OKAction = UIAlertAction(title: “OK”, style: .default)
alertController.addAction(OKAction)
var alertWindow : UIWindow!
alertWindow = UIWindow.init(frame: UIScreen.main.bounds)
alertWindow.rootViewController = UIViewController.init()
alertWindow.windowLevel = UIWindow.Level.alert + 1
alertWindow.makeKeyAndVisible()
alertWindow.rootViewController?.present(alertController, animated: true)
}

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