CODEWITHSUNDEEP
iosswift
BenMQ
BenMQ

Reputation: 876

Text field on UIAlertController triggers disabled button

I have a UIAlertController with a UITextField and a submit button. The code looks like this:

let saveDialogue = UIAlertController(title: "Save Level",
    message: "",
    preferredStyle: .Alert)

let saveAction = UIAlertAction(title: "Save", style: .Default,
    handler: { (action) in
        let textfield = saveDialogue.textFields![0] as UITextField
        // do something with the textfield
    }
)
saveAction.enabled = false
saveDialogue.addTextFieldWithConfigurationHandler { (textField) in
    textField.placeholder = "My Level"
    textField.text = filename
    // conditionally enable the button 
    textField.addTarget(self, action: "textChanged:", forControlEvents: .EditingChanged)

}

While the button cannot be tapped, hitting the return key on the keyboard triggers the default action (saveAction).

Is there a way around this? I also tried to validate the textfield value in the handler, but the view will be dismissed. Can it be retained?

Upvotes: 1

Views: 1274

Answers (2)

Alok C
Alok C

Reputation: 2857

I did solve the same problem little bit differently. 

//where alert is variable in class 
    override func textField(_ textField: UITextField,
                            shouldChangeCharactersIn range: NSRange,
                            replacementString string: String) -> Bool {
        if range.location >= 1 { return true } // if we have one or more characters

        guard let isTextFieldEmpty = textField.text?.isEmpty else { return true }

        if !isTextFieldEmpty {
            alert?.actions.first?.isEnabled = false
        } else {
            alert?.actions.first?.isEnabled = true
        }
        return true
    }

Upvotes: 0

kishikawa katsumi
kishikawa katsumi

Reputation: 10573

If you want to ignore the return key input, set textField's delegate and return false in textFieldShouldReturn: delegate method.

Like bellow:

saveDialogue.addTextFieldWithConfigurationHandler { (textField) in
    textField.placeholder = "My Level"
    textField.text = "hello"
    // conditionally enable the button
    textField.addTarget(self, action: "textChanged:", forControlEvents: .EditingChanged)

    // Add this line
    textField.delegate = self
}

func textFieldShouldReturn(textField: UITextField) -> Bool {
    return false
}

Upvotes: 5

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