UITextField And UILabel Tips

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UITextField Tips

Add a top Line on Keyboard

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extension UITextField {
    func addTopLineOnKeyboard() {
        let line = UIView(frame: CGRect(x: 0, y: 0, width: 2000, height: 0.5))
        line.backgroundColor = "979797".color

        inputAccessoryView = line
    }
}

Only allowed a price number with exactly two decimals

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func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    let str = (textField.text! as NSString).replacingCharacters(in: range, with: string)

    let regex = "^([1-9]\\d{0,7}|0)(\\.\\d{0,2})?$|^$"
    let predicte = NSPredicate(format: "SELF MATCHES %@", regex)

    return  predicte.evaluate(with: str)
}

Only allowed 1-100 or leave blank

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

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

    // 1-100 or leave blank
    let regex = "^[1-9]?\\d|100|[1-9]?$"
    let predicte = NSPredicate(format: "SELF MATCHES %@", regex)

    return  predicte.evaluate(with: str)
}

UILabel Tips

Formate cell-phone number to 111 1111 111

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extension String {
    var phoneNumberFormater: String {
        get {
            var s = self.replacingOccurrences(of: " ", with: "")
            let count = s.characters.count
            if count > 7 {
                s.insert(" ", at: s.index(s.startIndex, offsetBy: 3))
                s.insert(" ", at: s.index(s.startIndex, offsetBy: 8))
            } else if count > 3 {
                s.insert(" ", at: s.index(s.startIndex, offsetBy: 3))
            }
            return s
        }
    }
}

Highlight UILabel’s substring by given string

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var userInputPhoneNumber = "123"

@IBOutlet private weak var phoneLabel: UILabel!

var phoneNumber:  String = "123456789" {
didSet {
    let atrStr = NSMutableAttributedString(string: phoneNumber.phoneNumberFormater)

    let font = UIFont.systemFont(ofSize: 14)
    let range = (phoneNumber.phoneNumberFormater as NSString).range(of: userInputPhoneNumber.phoneNumberFormater)

    if range.location == 0 {
        atrStr.addAttributes([NSFontAttributeName :  font, NSForegroundColorAttributeName: UIColor.red], range: (phoneNumber.phoneNumberFormater as NSString).range(of: userInputPhoneNumber.phoneNumberFormater))
    }

    phoneLabel.attributedText = atrStr
}
}