UIAertView上的UITextView(多行输入)

let alertController = UIAlertController(title: "Title", message: "Message", preferredStyle: .alert)

let textView = UITextView(frame: CGRect(x: 0, y: 0, width: 240, height: 160))
alertController.view.addSubview(textView)

alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: { action in
    // Handle the user's input here
}))

alertController.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))

self.present(alertController, animated: true, completion: nil)