UITextField with maxLength property

UITextField+maxLength.swift

private var __maxLengthsForTextField = [UITextField: Int]()
extension UITextField {
    //https://stackoverflow.com/a/43099816/3110026
    @IBInspectable var maxLength: Int {
        get {
            guard let l = __maxLengthsForTextField[self] else {
                return 150 // (global default-limit. or just, Int.max)
            }
            return l
        }
        set {
            __maxLengthsForTextField[self] = newValue
            addTarget(self, action: #selector(fix), for: .editingChanged)
        }
    }
    @objc func fix(textField: UITextField) {
        if let t = textField.text {
            textField.text = String(t.prefix(maxLength))
        }
    }
}