2 ответов:
обновлено для Swift 3 и выше:
//1. Create the alert controller. let alert = UIAlertController(title: "Some Title", message: "Enter a text", preferredStyle: .alert) //2. Add the text field. You can configure it however you need. alert.addTextField { (textField) in textField.text = "Some default text" } // 3. Grab the value from the text field, and print it when the user clicks OK. alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { [weak alert] (_) in let textField = alert.textFields![0] // Force unwrapping because we know it exists. print("Text field: \(textField.text)") })) // 4. Present the alert. self.present(alert, animated: true, completion: nil)
Swift 2.x
предполагая, что вы хотите предупреждение о действиях на iOS:
//1. Create the alert controller. var alert = UIAlertController(title: "Some Title", message: "Enter a text", preferredStyle: .Alert) //2. Add the text field. You can configure it however you need. alert.addTextFieldWithConfigurationHandler({ (textField) -> Void in textField.text = "Some default text." }) //3. Grab the value from the text field, and print it when the user clicks OK. alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: { [weak alert] (action) -> Void in let textField = alert.textFields![0] as UITextField println("Text field: \(textField.text)") })) // 4. Present the alert. self.presentViewController(alert, animated: true, completion: nil)
Swift 3/4
вы можете использовать следующие расширения для вашего удобства.
использование внутри
ViewController:showInputDialog(title: "Add number", subtitle: "Please enter the new number below.", actionTitle: "Add", cancelTitle: "Cancel", inputPlaceholder: "New number", inputKeyboardType: .numberPad) { (input:String?) in print("The new number is \(input ?? "")") }добавочный код:
extension UIViewController { func showInputDialog(title:String? = nil, subtitle:String? = nil, actionTitle:String? = "Add", cancelTitle:String? = "Cancel", inputPlaceholder:String? = nil, inputKeyboardType:UIKeyboardType = UIKeyboardType.default, cancelHandler: ((UIAlertAction) -> Swift.Void)? = nil, actionHandler: ((_ text: String?) -> Void)? = nil) { let alert = UIAlertController(title: title, message: subtitle, preferredStyle: .alert) alert.addTextField { (textField:UITextField) in textField.placeholder = inputPlaceholder textField.keyboardType = inputKeyboardType } alert.addAction(UIAlertAction(title: actionTitle, style: .destructive, handler: { (action:UIAlertAction) in guard let textField = alert.textFields?.first else { actionHandler?(nil) return } actionHandler?(textField.text) })) alert.addAction(UIAlertAction(title: cancelTitle, style: .cancel, handler: cancelHandler)) self.present(alert, animated: true, completion: nil) } }
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