UICurrencyTextField.swift

//
//  CurrencyEditField.swift
//  TSoftShopper
//
//  Created by Burak Dizlek on 12.06.2019.
//  Copyright © 2019 Burak Dizlek. All rights reserved.
//

import Foundation

class UICurrencyTextField : UITextField, UITextFieldDelegate {
    
    var amt:Int = 0
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        self.delegate = self
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
    
    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        if let digit = Int(string){
            amt = amt * 10 + digit
            self.text = updateAmount()
        }

        if string == "" {
            amt = amt/10
            self.text = updateAmount()
        }
        return  false

    }
    
    func updateAmount() -> String? {
        let formatter = NumberFormatter()
        formatter.numberStyle = .currency
        let amount = Double(amt/100) + Double(amt%100)/100
        return formatter.string(from: NSNumber(value: amount))
    }
}