Displaying an Alert

The first step is to declare an alertController as a variable.

let alertController = UIAlertController(title: "Alert Title", message: "Additional Information - message", preferredStyle: .alert)

The next step described an optional textField for user data entry.

alertController.addTextField { (textfield: UITextField) -> Void in
}

Here we do something with textFiled data, adding it to an array. This would only be included to act on the textfield data.

let addAction = UIAlertAction(title: "Add", style: .default) { (action: UIAlertAction) in
	let textField = alertController.textFields?.first
	
	self.dataArray.append((textField?.text)!)
	
	self.tableView.reloadData() // reload the data in the tableview
}

We can add additional buttons, here OK and Cancel, to remove the alert and perform optional actions as needed. Here, none for OK and print for Cancel.

let OKAction = UIAlertAction(title: "OK", style: .default)

let cancelAction = UIAlertAction(title: "Cancel", style: .default) { (action: UIAlertAction) in
	print("Optional action")
}

The final step is to add the actions to the alert viewcontroller and display the alert.

alertController.addAction(addAction)
alertController.addAction(OKAction)
alertController.addAction(cancelAction)

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

An Example Alert

Index