How To Validate TextField Using Swift 2.0 In iOS

So you want to know How To Validate TextField Using Swift 2.0 In iOS? Don’t worry Inwizards, a leading Software Development Company has expert developers that has solution to your query.

Objective:- Make a registration form with apply all required validation.

Create a new project

Open Xcode , create a new “Single Page Application” and select Swift as the programming language.

Add a TextField property

Open the ViewController.swift class and add a new tableview instance variable below the class declaration.

@IBOutlet weak var firstName: UITextField!

@IBOutlet weak var LastName: UITextField!

@IBOutlet weak var UserName: UITextField!

@IBOutlet weak var DateofBirth: UITextField!

@IBOutlet weak var MobileNo: UITextField!

@IBOutlet weak var password: UITextField!

@IBOutlet weak var Cpassword: UITextField!

@IBOutlet weak var DOB: UIDatePicker!

@IBOutlet weak var emailID: UITextField!

Add Source File from project directory.

TextFieldValidation.swift

ValidationError.swift

ValidationErrorType.swift

ValidationFactory.swift

ValidationRule.swift

ValidationRuleType.swift

Validator.swift

Validation.swift

Confirm to the TextField Delegate.

To conform to the UITextFieldDelegate,ValidationFieldDelegate just add them separated by colons after UIViewController in the class declaration. This was a bit confusing at first but the new protocol syntax is cleaner.

class ViewController: UIViewController,UITextFieldDelegate,ValidationFieldDelegate

{

…….

}

Add a TextField in your view controller

Search in the component library(It should be in the lower right corner) for TextField and then drag and drop it on the view.

Connect the Interface Builder Outlets

Connect the referencing delegate outlets.
We can connect the respective outlets using interface builder by right clicking on the textfield view and dragging each outlet on the view controller.

Now Goto ViewController.swift file

import UIKit

struct MoveKeyboard {

static let KEYBOARD_ANIMATION_DURATION : CGFloat = 0.3

static let MINIMUM_SCROLL_FRACTION : CGFloat = 0.2;

static let MAXIMUM_SCROLL_FRACTION : CGFloat = 0.8;

static let PORTRAIT_KEYBOARD_HEIGHT : CGFloat = 216;

static let LANDSCAPE_KEYBOARD_HEIGHT : CGFloat = 162;

}

class ViewController:UIViewController,UITextFieldDelegate,ValidationFieldDelegate,UIAlertViewDelegate

{

//************************************************************************************************

// MARK: Create Outlets and Proprty.

//************************************************************************************************

@IBOutlet weak var firstName: UITextField!

@IBOutlet weak var LastName: UITextField!

@IBOutlet weak var UserName: UITextField!

@IBOutlet weak var DateofBirth: UITextField!

@IBOutlet weak var MobileNo: UITextField!

@IBOutlet weak var password: UITextField!

@IBOutlet weak var Cpassword: UITextField!

@IBOutlet weak var DOB: UIDatePicker!

@IBOutlet weak var emailID: UITextField!

var animateDistance:CGFloat!

var validator = Validator()

var databasePath = NSString()

var Fields = [“Email”,“Phone”,“Password”,“Cpassword”,“UserID”,“fname”,“Lname”,“dob”]

//*************************************************************************************************

// MARK: viewDidLoad

//*************************************************************************************************

override func viewDidLoad() {

super.viewDidLoad()

self.setUpUI()

}

func setUpUI(){

emailID.delegate = self

MobileNo.delegate = self

password.delegate = self

Cpassword.delegate = self

UserName.delegate = self

firstName.delegate = self

LastName.delegate = self

DateofBirth.delegate = self

// MARK: Apply Validation on textfield.

validator.registerFieldByKey(Fields[0],textField: emailID,rules: [.Required, .Email])

validator.registerFieldByKey(Fields[1],textField: MobileNo,rules: [.Required, .PhoneNumber])

validator.registerFieldByKey(Fields[2],textField: password,rules: [.Required, .Password])

validator.registerFieldByKey(Fields[3],textField: Cpassword,rules: [.Required, .Password])

validator.registerFieldByKey(Fields[4],textField: UserName,rules: [.Required, .MinLength])

validator.registerFieldByKey(Fields[5],textField: firstName,rules: [.Required, .MaxLength])

validator.registerFieldByKey(Fields[6],textField: LastName,rules: [.Required, .MaxLength])

}

//*************************************************************************************************

// MARK: Use datePicker for valueChanged on textField.

//*************************************************************************************************

@IBAction func dobtext(sender: UITextField)

{

let datePickerView : UIDatePicker = UIDatePicker()

datePickerView.datePickerMode = UIDatePickerMode.Date

sender.inputView = datePickerView

datePickerView.addTarget(self, action: Selector(“handleDatePicker:”), forControlEvents:UIControlEvents.ValueChanged)

}

func handleDatePicker(sender: UIDatePicker)

{

let dateFormatter = NSDateFormatter()

dateFormatter.dateFormat = “dd MMM yyyy”

DateofBirth.text = dateFormatter.stringFromDate(sender.date)

}

//**************************************************************************************************

// MARK: TextField Delegate Method For Moving Keyboard.

//**************************************************************************************************

func textFieldDidBeginEditing(textField: UITextField) {

let textFieldRect : CGRect = self.view.window!.convertRect(textField.bounds, fromView: textField)

let viewRect : CGRect = self.view.window!.convertRect(self.view.bounds, fromView: self.view)

let midline : CGFloat = textFieldRect.origin.y + 0.5 * textFieldRect.size.height

let numerator : CGFloat = midline – viewRect.origin.y – MoveKeyboard.MINIMUM_SCROLL_FRACTION * viewRect.size.height

let denominator : CGFloat = (MoveKeyboard.MAXIMUM_SCROLL_FRACTION –MoveKeyboard.MINIMUM_SCROLL_FRACTION) * viewRect.size.height

var heightFraction : CGFloat = numerator / denominator

if heightFraction < 0.0 {

heightFraction = 0.0

} else if heightFraction > 1.0 {

heightFraction = 1.0

}

let orientation : UIInterfaceOrientation = UIApplication.sharedApplication().statusBarOrientation

if (orientation == UIInterfaceOrientation.Portrait || orientation == UIInterfaceOrientation.PortraitUpsideDown) {

animateDistance = floor(MoveKeyboard.PORTRAIT_KEYBOARD_HEIGHT * heightFraction)

} else {

animateDistance = floor(MoveKeyboard.LANDSCAPE_KEYBOARD_HEIGHT * heightFraction)

}

var viewFrame : CGRect = self.view.frame

viewFrame.origin.y -= animateDistance

UIView.beginAnimations(nil, context: nil)

UIView.setAnimationBeginsFromCurrentState(true)

UIView.setAnimationDuration(NSTimeInterval(MoveKeyboard.KEYBOARD_ANIMATION_DURATION))

self.view.frame = viewFrame

UIView.commitAnimations()

}

func textFieldDidEndEditing(textField: UITextField) {

var viewFrame : CGRect = self.view.frame

viewFrame.origin.y += animateDistance

UIView.beginAnimations(nil, context: nil)

UIView.setAnimationBeginsFromCurrentState(true)

UIView.setAnimationDuration(NSTimeInterval(MoveKeyboard.KEYBOARD_ANIMATION_DURATION))

self.view.frame = viewFrame

UIView.commitAnimations()

}

func textFieldShouldReturn(textField: UITextField) -> Bool {

textField.resignFirstResponder()

return true

}

func DismissKeyboard(){

emailID.resignFirstResponder()

MobileNo.resignFirstResponder()

UserName.resignFirstResponder()

UserName.resignFirstResponder()

LastName.resignFirstResponder()

password.resignFirstResponder()

Cpassword.resignFirstResponder()

}

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

if(string == “\n”){

emailID.resignFirstResponder()

MobileNo.resignFirstResponder()

UserName.resignFirstResponder()

UserName.resignFirstResponder()

LastName.resignFirstResponder()

password.resignFirstResponder()

Cpassword.resignFirstResponder()

return false

}

return true

}

override func prefersStatusBarHidden() -> Bool {

return true

}

//*******************************************************************************************************************************************//

// MARK: Validation Delegate Function.

//*******************************************************************************************************************************************//

func validationFieldFailed(key:String, error:ValidationError)

{

//set error textfield border to red.

_ = UITextField(frame: CGRectMake(0.0, 0.0, 200.0, 44.0))

error.textField.layer.cornerRadius = 8.0

error.textField.layer.masksToBounds = true

error.textField.layer.borderColor = UIColor.redColor().CGColor

error.textField.layer.borderWidth = 2.0

error.textField

}

func validationFieldSuccess(key:String, validField:UITextField)

{

//set valid textfield border to green

_ = UITextField(frame: CGRectMake(0.0, 0.0, 200.0, 44.0))

validField.layer.cornerRadius = 8.0

validField.layer.masksToBounds = true

validField.layer.borderColor = UIColor.greenColor().CGColor

validField.layer.borderWidth = 2.0

validField

}

@IBAction func validateField(sender: AnyObject)

{

switch (sender as! UITextField)

{

case emailID :

validator.validateFieldByKey((Fields[0]), delegate: self)

break

case MobileNo :

validator.validateFieldByKey((Fields[1]), delegate: self)

break

case password :

validator.validateFieldByKey((Fields[2]), delegate: self)

break

case Cpassword :

validator.validateFieldByKey((Fields[3]), delegate: self)

break

case UserName :

validator.validateFieldByKey((Fields[4]), delegate: self)

break

case firstName :

validator.validateFieldByKey((Fields[5]), delegate: self)

break

case LastName :

validator.validateFieldByKey((Fields[6]), delegate: self)

break

default :

print(“no fields to validate”)

}

}

@IBAction func SubmitAction(sender: AnyObject)

{

if (firstName == nil || firstName.text == “”)

{

validator.validateFieldByKey(Fields[5], delegate: self)

let alert = UIAlertView(title: “Error”, message: “Please Enter Your First Name”, delegate: self, cancelButtonTitle: “OK”)

alert.show()

}

else if (LastName == nil || LastName.text == “”)

{ validator.validateFieldByKey(Fields[6], delegate: self)

let alertview = UIAlertView(title: “Error”, message: “Please Enter Your Last Name”, delegate: self, cancelButtonTitle: “ok”)

alertview.show()

}

else if (UserName == nil || UserName.text == “”)

{

validator.validateFieldByKey(Fields[4], delegate: self)

let alertview = UIAlertView(title: “Error”, message: “UserID Short Should be 5 Char. “, delegate: self, cancelButtonTitle: “ok”)

alertview.show()

}

else if (MobileNo == nil || MobileNo.text == “”)

{

validator.validateFieldByKey(Fields[1], delegate:self)

let alertview = UIAlertView(title: “Error”, message: “Please Enter Mobile No. and must be 10 digit “, delegate:self, cancelButtonTitle: “ok”)

alertview.show()

}

else if (emailID == nil || emailID.text == “”)

{

validator.validateFieldByKey(Fields[0], delegate:self)

let alertview = UIAlertView(title: “Error”, message: “Please Enter Your Email Address”, delegate: self, cancelButtonTitle: “ok”)

alertview.show()

}

else if (password == nil || password.text == “”)

{ validator.validateFieldByKey(Fields[2], delegate: self)

let alertview = UIAlertView(title: “Error”, message: “Please Enter Your Password “, delegate: self, cancelButtonTitle: “ok”)

alertview.show()

}

else if (Cpassword == nil || Cpassword.text == “”)

{ validator.validateFieldByKey(Fields[3], delegate: self)

let alertview = UIAlertView(title: “Error”, message: “Please Enter Confirm Password “, delegate: self, cancelButtonTitle: “ok”)

alertview.show()

}

else if(password.text != Cpassword.text)

{

let alert = UIAlertView(title: “Alert”, message: “Password And Confirm Password Should Be Same”, delegate:self, cancelButtonTitle: “Cancel”,otherButtonTitles: “Ok”)

alert.show()

password.text = “”

Cpassword.text = “”

}

else{

let alert = UIAlertView(title: “Success”, message: “All Validation is correct”, delegate: self, cancelButtonTitle:nil,otherButtonTitles: “Ok”)

alert.show()

}

}

}

You can download Demo project from here.