How to disable pasting in a TextField in Swift?

Question

I\'ve got a TextField with a numberPad and the function runs only if it contains numbers.

The user will crash the app if they paste letters

Answer 1

You can just attach an IBAction to your Sent Events (editing changed) of your textfield to filter non numbers out of your string as you type as follow:

@IBAction func changedTextAction(_ sender: UITextField) {
    sender.text = sender.text?.filter(\.isWholeNumber)
}

This will allow the user to paste into the field but it will filter all non digits from the string.