I was wondering if there is a way to check if a text field contains a certain character and if that is the case, change the keyboard type displayed. This is what I have tried but it does not manage to change. This is action occurs when editing the text field is changed.

    @IBAction func decOrNot(_ sender: Any) {
    let cont = "1"
    let field = testKaede.text
    if (field!.contains(cont)) {
        self.testKaede.keyboardType = UIKeyboardType.numberPad
    }
    else {
        self.testKaede.keyboardType = UIKeyboardType.decimalPad
    }
}