Brazilian telephone mask

Question

I’m migrating from Android to iOS now, and I’m having a question. I can do on Swift something like onTextChanged java?

I need a Mask for my UITextField which is dynamic according to the number of characters entered (## ####-#### or ## #####-####).

How can I handle it on Swift 3?

Answer 1

You can use the function textField shouldChangeCharactersIn range. To do this, you need to connect the Uitextfield delegate to your Viewcontroller (either through storyboard or through code), create an outlet for that textField in your Viewcontroller code, implement the Uitextfielddelegate protocol, and use the code as described below. It will allow you to format the Brazilian number already including the fifth number after the area code. To make it clear, below where I use "cellPhoneTextField", you must use the name of the textField outlet for the phone number you have connected with the storyboard.

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

    if textField == cellPhoneTextField {

        //New String and components
        let newStr = (textField.text! as NSString).replacingCharacters(in: range, with: string)
        let components = (newStr as NSString).components(separatedBy: NSCharacterSet.decimalDigits.inverted)

        //Decimal string, length and leading
        let decimalString = components.joined(separator: "") as NSString
        let length = decimalString.length
        let hasLeadingOne = length > 0 && decimalString.character(at: 0) == (1 as unichar)

        //Checking the length
        if length == 0 || (length > 11 && !hasLeadingOne) || length > 13 {
            let newLength = (textField.text! as NSString).length + (string as NSString).length - range.length as Int

            return (newLength > 11) ? false : true
        }

        //Index and formatted string
        var index = 0 as Int
        let formattedString = NSMutableString()

        //Check if it has leading
        if hasLeadingOne {
            formattedString.append("1 ")
            index += 1
        }

        //Area Code
        if (length - index) > 2 {
            let areaCode = decimalString.substring(with: NSMakeRange(index, 2))
            formattedString.appendFormat("%@ ", areaCode)
            index += 2
        }

        if length - index > 5 {
            let prefix = decimalString.substring(with: NSMakeRange(index, 5))
            formattedString.appendFormat("%@-", prefix)
            index += 5
        }

        let remainder = decimalString.substring(from: index)
        formattedString.append(remainder)
        textField.text = formattedString as String
        return false

    } else {
        return true
    }

}

Answer 2

For development Swift the best thing to do to save time and lines of code is to use Frameworks, something extremely abundant in iOS.

In this case I suggest using the Tlcustommask, easy to implement using Podfile.

Follow the Github framework Tlcustommask