Inputboxをalertで表示する

サンプル：alert表示のInputboxで現在のViewControllerのname属性を修正するロジック

let ac = UIAlertController(title: "New Name", message: "", preferredStyle: .alert)
        
let done = UIAlertAction(title: "Done", style: .default) { [weak self, weak ac](action) in
    guard let textFields = ac?.textFields else { return }
    for textField in textFields {
        if textField.tag == 1 {
            guard let newName = textField.text else { return }
            self?.name = newName
        }
    }
}
        
let cancel = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
        
ac.addTextField(configurationHandler: {(textField:UITextField!) -> Void in
    textField.text = self.name
    textField.tag  = 1
})

ac.addAction(done)
ac.addAction(cancel)
present(ac, animated: true, completion: nil)