currencyDelegate

gistfile1.txt

//
//  CurrencyDelegate.swift
//  TextFieldDelegate
//
//  Created by Timothy Isenman on 12/10/17.
//  Copyright © 2017 Timothy Isenman. All rights reserved.
//

import Foundation
import UIKit


class CurrencyDelegate: NSObject, UITextFieldDelegate {
    
    var amount: Int = 0
    
    func currencyAmount() -> String? {
        let formatter = NumberFormatter()
        formatter.numberStyle = .currency
        let amount = Double(self.amount/100) + Double(self.amount%100)/100
        return formatter.string(from: NSNumber(value: amount))
    }
    
    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        
        if let digit = Int(string) {
            amount = amount * 10 + digit
            textField.text = String(describing: currencyAmount())
        } else if string == "" {
            amount = amount / 10
            textField.text = String(describing: currencyAmount())
        }

        return false
    }
}