/Swift/Swift uitextfield only numbers keyboard lock programmatically

Swift uitextfield only numbers keyboard lock programmatically

class ViewController: UIViewController, UITextFieldDelegate {

    @IBOutlet weak var textField: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()

        // you can set the following two properties for the text field in Interface Builder, if you'd prefer

        textField.delegate = self
        textField.keyboardType = .numberPad
    }

    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        let invalidCharacters = CharacterSet(charactersIn: "0123456789").inverted
        return string.rangeOfCharacter(from: invalidCharacters) == nil
    }

    // or, alternatively:
    //
    // func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
    //     return string.range(of: "^\\d*$", options: .regularExpression) != nil
    // }

}

Source: stackoverflow.com

Similar codes

2 votes330 views1 answer
Conert data to string swift
Swift
1 vote331 views2 answers
Swift collection view cell size
Swift
0 vote336 views2 answers
Float vs double in swift
Swift
1 vote354 views1 answer
Pop the view controller xcode
Swift
1 vote334 views1 answer
How to select but not focus textfield swift
Swift
1 vote360 views1 answer
Get tabbar height swift
Swift
0 vote414 views1 answer
Regular expression for number less than 100
Swift
0 vote340 views1 answer
Remove key by index dictionary swift
Swift
0 vote362 views1 answer
Swift userdefaults enum
Swift
0 vote352 views2 answers
Uibutton change text
Swift