How to get range of textField text till 6 characters?

Question

I've a UITextField for entering pincode number.
My requirement is when textField character range reach to 6th character then I've to do server validation and I have to put the data in labels. If character range is less than 5 then I will pass nil value.

Below is my code :-

//TextField character range
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

    if textField == pinCode
    {
        guard let text = textField.text else { return  true }

        let newLength = text.characters.count + string.characters.count - range.length
        if(5 >= newLength)
        {
            print(newLength)
        }

        else
        {
            if newLength == 6
            {
                serverValidation()

                print(textField.text!)
                setFields(city: "Ajmer", state: "Rajasthan", country: "India")
                return newLength <= 6
            }
            else
            {
                 return newLength <= 6
            }
        }

    }

    return true
} 

My problem is when (newLength == 6) then I'm getting textField text of 5 characters only. I mean if suppose zip code is 560068 then text I'm getting 56006 only. (But I've to do server validation in that condition only for 6 characters zip code)

So if (newLength == 6) then how can I get 6 characters in text field, and then I can do server validation here only.

I'm new in swift.

Thanks

Answer 1

shouldChangeCharactersIn will get called prior to getting the actual text in the UITextField

This is how you get the full text from that UITextField

let newString = NSString(string: textField.text!).replacingCharacters(in: range, with: string)

Edit

this is how you can use it

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

    if textField == pinCode
    {
        guard let text = textField.text else { return  true }

        let newString = NSString(string: textField.text!).replacingCharacters(in: range, with: string)
        let newLength = newString.characters.count

        if(5 >= newLength)
        {
            print(newLength)
        }

        else
        {
            if newLength == 6
            {
                serverValidation()

                print(newString)
                setFields(city: "Ajmer", state: "Rajasthan", country: "India")
                return newLength <= 6
            }
            else
            {
                 return newLength <= 6
            }
        }

    }

    return true
} 

Answer 2

Try this

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

if textField == pinCode
{
    guard let text = textField.text else { return  true }

    var txtAfterUpdate:NSString = textField.text! as NSString
    txtAfterUpdate = txtAfterUpdate.stringByReplacingCharactersInRange(range, withString: string)
    let txtString = txtAfterUpdate as String

    let newLength = txtString.characters.count
    if(5 >= newLength)
    {
        print(newLength)
    }

    else
    {
        if newLength == 6
        {
            print(textField.text!)
            setFields(city: "Ajmer", state: "Rajasthan", country: "India")
            return newLength <= 6
        }
        else
        {
            return newLength <= 6
        }
    }

}

return true
}

Answer 3

Use TextField delegates method for this.

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

 let currentCharacterCount = textField.text?.characters.count ?? 0
            if (range.length + range.location > currentCharacterCount+1)
            {
                return false
            }

            print(currentCharacterCount)
            let newLength = currentCharacterCount + string.characters.count - range.length
            return newLength <= 6 //this will not allow you to enter more than 6 characters 

}

After that call

func textFieldDidEndEditing(_ textField: UITextField)
 {
             print(textField.text!)
            setFields(city: "Ajmer", state: "Rajasthan", country: "India")
}

to call this method you can use view.endEditing(true) method.

Answer 4

You should get newlength from textfield.text.length + string.length

then get the text from textfield.text + string.

You can't get new text from textfield.text before call return true.