Swift: Encrypted input for UITextField for map information

Question

I want to accept Card details as input from user. The condition is that first 10 character will be hiddenwhere asuser will be allowed to enter next 6 character.

I used four text fields for this (my guess). Any other suggestion is welcome.

Q.1. How to allow the user to enter directly from the 11th character in the third text field?

In the Expiration Date field, I used two text fields.

IN 2. How to make a text box has a border at the bottom (without left, right and top border)?

Answer 1

, :

• 1- 2- . Ive (.. XX), . .

  .. , / Ive (14 ) . 6 .

  , . , 4- , " " .

• setBorderColor " " "".

• Ive UIToolbar with done button ( ) .

, Ive :

@IBOutlet weak var txtCardDetails1: UITextField!

    @IBOutlet weak var txtCardDetails2: UITextField!
    @IBOutlet weak var txtCardDetails3: UITextField!
    @IBOutlet weak var txtCardDetails4: UITextField!

    @IBOutlet weak var txtExpiryMonth: UITextField!
    @IBOutlet weak var txtExpiryYear: UITextField!

    let objBlackColor = UIColor.blackColor()
    let objGreyColor = UIColor.grayColor() 

func viewDidLoad() {          super.viewDidLoad()

        //Add done button to numeric pad keyboard
        let toolbarDone = UIToolbar.init()
        toolbarDone.sizeToFit()
        let barBtnDone = UIBarButtonItem.init(barButtonSystemItem: UIBarButtonSystemItem.Done,
                                              target: self, action: #selector(VerifyCardViewController.doneButton_Clicked(_:)))

        toolbarDone.items = [barBtnDone] // You can even add cancel button too
        txtCardDetails3.inputAccessoryView = toolbarDone
        txtCardDetails4.inputAccessoryView = toolbarDone
        txtExpiryMonth.inputAccessoryView = toolbarDone
        txtExpiryYear.inputAccessoryView = toolbarDone

        // Set an action on EditingChanged event of textfield
        txtCardDetails3.addTarget(self, action: #selector(VerifyCardViewController.textFieldDidChange(_:)), forControlEvents: UIControlEvents.EditingChanged)

        txtCardDetails4.addTarget(self, action: #selector(VerifyCardViewController.textFieldDidChange(_:)), forControlEvents: UIControlEvents.EditingChanged)

        txtExpiryMonth.addTarget(self, action: #selector(VerifyCardViewController.textFieldDidChange(_:)), forControlEvents: UIControlEvents.EditingChanged)

        setBorderColor(txtExpiryMonth,setBorderColor: objGreyColor)
        setBorderColor(txtExpiryYear,setBorderColor: objGreyColor)
    }


 //Set bottom border color to textfield 
    func setBorderColor(objTextField : UITextField, setBorderColor objColor:UIColor) {
        let bottomLine = CALayer()
        bottomLine.frame = CGRectMake(0.0, objTextField.frame.height - 1, objTextField.frame.width, 1.0)
        bottomLine.backgroundColor = objColor.CGColor

        objTextField.borderStyle = UITextBorderStyle.None
        objTextField.layer.addSublayer(bottomLine)
    }

    func doneButton_Clicked(sender: AnyObject) { // Hide keyboard when done button is clicked
        txtCardDetails3.resignFirstResponder()
        txtCardDetails4.resignFirstResponder()
        txtExpiryMonth.resignFirstResponder()
        txtExpiryYear.resignFirstResponder()
    }

  func textFieldDidChange(textField: UITextField){ // Change text focus as per condition

        let text = textField.text

        if textField.tag == 101 { // Set tag to textfield (if multiple) during design time
            if text?.utf16.count==2 {
                txtCardDetails4.becomeFirstResponder() // Move to next text field
            }
        }
        else if textField.tag == 102 {
            if text?.utf16.count==4 {
                txtExpiryMonth.becomeFirstResponder()
            }
        }
        else if textField.tag == 103 {
            if text?.utf16.count==2 {
                txtExpiryYear.becomeFirstResponder()
            }
        }
    }

    func textFieldDidBeginEditing(textField: UITextField) {

        if textField.tag == 103 { // Set border color based on focus
           setBorderColor(txtExpiryMonth,setBorderColor: objBlackColor)
        }
        else if textField.tag == 104 {
           setBorderColor(txtExpiryMonth,setBorderColor: objBlackColor)
        }

        textField.becomeFirstResponder()
    }

    func textFieldShouldReturn(textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true;
    }

 //User can enter two digits in textfield with tag 101, 103, 104 and four digits in textfield with tag 102
    func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
        if let text = textField.text {

            let newStr = (text as NSString)
                .stringByReplacingCharactersInRange(range, withString: string)
            if newStr.isEmpty {
                return true
            }
            let intvalue = Int(newStr)

            if textField.tag == 101 || textField.tag == 103 || textField.tag == 104{
                 return (intvalue >= 0 && intvalue <= 99) ? true : false
            }
            else if textField.tag == 102 {
                 return (intvalue >= 0 && intvalue <= 9999) ? true : false
            }           

        }
        return true
    }

Answer 2

Q.1. 11- ?

A-1: ​​txt3.becomeFirstResponder()

.2. ( , )?

A-2: :

 func addbottomBorderWithColor(view : UIView, color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.CGColor
        border.frame = CGRectMake(15.0, view.frame.size.height-width, view.frame.size.width,width )
        view.layer.addSublayer(border)
    }