swift uitextfield only numbers keyboard lock programmatically

Quaint Quelea answered on October 8, 2020 Popularity 1/10 Helpfulness 1/10

answer swift uitextfield only numbers keyboard lock programmatically

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swift uitextfield only numbers keyboard lock programmatically

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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
    // }

}

Popularity 1/10 Helpfulness 1/10 Language swift

Source: stackoverflow.com

Tags: keyboard numbers programmatically swift uitextfield

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Contributed on Oct 08 2020

Quaint Quelea

0 Answers Avg Quality 2/10

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swift uitextfield only numbers keyboard lock programmatically

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func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        let bytes: [Unicode.UTF8.CodeUnit] = Array([0x7F, 0x08, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x2E, 0x2D])
        let newString = String(bytes: bytes, encoding: String.Encoding.utf8)!
        if let x = string.rangeOfCharacter(from: NSCharacterSet.init(charactersIn: newString) /* decimalDigits */ /* init(charactersIn: stringa) */ as CharacterSet) {
                return true
             } else {
             return false
          }
       }

Popularity 1/10 Helpfulness 1/10 Language swift

Source: Grepper

Tags: numbers programmatically swift uitextfield keyboard

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Contributed on Nov 04 2021

Awful Ape

0 Answers Avg Quality 2/10

swift uitextfield only numbers keyboard lock programmatically

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