How to get UITextField text editing changed events for user input validation - Swift Tips 1
How to get UITextField text editing changed events for user input validation - Swift Tips 1
Watch the new Swift 4 version: • How to Get UITextField Text Editing C...
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Learn how to get user input from text fields in your iPhone App. When a user types in a UITextField, you can get a method call for each character typed. This is important when you want to validate input or warn the user about invalid input.
You can provide real-time feedback to the user with the Text Editing Changed Events.
Right-click on a UITextField, drag a connection for the Editing Changed Event (sent events) or connect it in code using the UIControlEvents.EditingChanged enum value.
@IBAction func textFieldEditingDidChange(_ sender: AnyObject) {
print("textField: \(textField.text!)")
if validatePassword(text: textField.text!) {
// correct password
button.isEnabled = true
} else {
button.isEnabled = false
}
}
Code to add Events to UITextField
You can optionally do the connection in code, instead of using Assistant Editor. In viewDidLoad: add the code for any UITextField.
override func viewDidLoad() {
super.viewDidLoad()
// disable button
button.isEnabled = false
// The action can be made in code, uncomment to try it
// textField.addTarget(self, action: Selector("textFieldEditingDidChange:"), for: UIControlEvents.editingChanged) // Swift 2
// Swift 4 (you can leave off the parameters)
// textField.addTarget(self, action: #selector(textFieldEditingDidChange), for: UIControlEvents.editingChanged)
// Swift 4 (you can specify the parameters) use (_:) since the label is now _ in Swift 4
// textField.addTarget(self, action: #selector(textFieldEditingDidChange(_:)), for: UIControlEvents.editingChanged)
}
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