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

I have created a custom class for textField. I have handled the case when you want to enable/disable actions on textfield. You can customize the code as per your requirement. Set isActionsEnabled true/false for enable/disable actions on textfield.

Prefer to use

return super.canPerformAction(action, withSender: sender)

instead of

return true

because returning true might cause a crash in some cases.

Here is my code,

open class MyTextFieldEffect : UITextField {

    var isActionsEnabled = true {
        didSet {
            reloadInputViews()
        }
    }

override open func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
        /* disable particular actions
        if (action == #selector(paste(_:)) || action == #selector(copy(_:)) || action == #selector(select(_:)) || action == #selector(cut(_:)) || action == #selector(delete(_:)) || action == #selector(replace(_:withText:))  || action == #selector(select(_:))  || action == #selector(selectAll(_:)) || action == #selector(insertText(_:)) || action == #selector(draw(_:))) && !isActionsEnabled {
            return false
        }
        return super.canPerformAction(action, withSender: sender)
                                           */

       //disable all actions
        if !isActionsEnabled {
            return false
        }

        return super.canPerformAction(action, withSender: sender)
    }
}