Enable a login button only if all text fields have verified success - ios

Question

I want to enable login button once all the condition satisfied for text field. I have added editchange event to two text fields through starboard.By default i have adding one label to text field with red background color to indicate(wrong) once user enters correct values in textfield then i need to change label color to green color. It is not working as except.
My entire code:
import UIKit
import IQKeyboardManagerSwift
class SignInFormViewController: UIViewController , UITextFieldDelegate {
#IBOutlet weak var forgotPasswordButton: UIButton!
#IBOutlet weak var signInButton: UIButton!
// Existing User
#IBOutlet weak var existingEmailAddressTextField: UITextField!
#IBOutlet weak var existingPasswordTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
//Setting text fileds effect
self.makeTextFiledEffect(textField: existingEmailAddressTextField, backColor: UIColor.red, borderColor: UIColor.lightGray)
self.makeTextFiledEffect(textField: existingPasswordTextField, backColor: UIColor.red, borderColor: UIColor.lightGray)
//Disable sing button by default
signInButton.isEnabled = false
}
func makeTextFiledEffect(textField : UITextField, backColor : UIColor, borderColor : UIColor) {
for viewPrevious in textField.subviews{
if viewPrevious.tag == 1000{
viewPrevious.removeFromSuperview()
}
}
let arrowView = UILabel(frame: CGRect(x:0, y: 0, width: 5, height: textField.frame.size.height))
arrowView.tag = 1000
arrowView.backgroundColor = backColor
textField.changeDynamicBorderColor(borderColor: borderColor)
textField.addSubview(arrowView)
}
#IBAction func validateTextField(_ sender: UITextField) {
if sender.text?.count == 1 {
if sender.text?.first == " " {
sender.text = ""
return
}
}
guard
let emaiTextField = existingEmailAddressTextField.text, !emaiTextField.isEmpty && self.validateEmail(emaiTextField)==true ,
let password = existingPasswordTextField.text, !password.isEmpty
else {
self.makeTextFiledEffect(textField: sender, backColor: UIColor.red, borderColor: UIColor.lightGray)
self.signInButton.isEnabled = false
return
}
self.makeTextFiledEffect(textField: sender, backColor: UIColor.green, borderColor: UIColor.lightGray)
signInButton.isEnabled = true
}
#IBAction func signInButtonTapped(_ sender: UIButton) {
print("Tapped")
}
func validateEmail(_ candidate: String) -> Bool {
let emailRegex = "[A-Z0-9a-z._%+-]+#[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}"
return NSPredicate(format: "SELF MATCHES %#", emailRegex).evaluate(with: candidate)
}
}
extension UITextField
{
func changeDynamicBorderColor(borderColor : UIColor){
self.layer.borderColor = borderColor.cgColor
}
open override func draw(_ rect: CGRect) {
self.layer.cornerRadius = 10.0
self.layer.borderWidth = 1.0
// self.layer.borderColor = UIColor.lightGray.cgColor
self.layer.masksToBounds = true
}
}
You can find a similar question : Enable a button in Swift only if all text fields have been filled out
Thanks in advance..

Answer 1

Follow the below basic steps to achieve your goal:-
Create a function which will perform all the validations(UI Level or API level or any validation). If any validation fails, it will return false, otherwise return true
loginButton.isEnabled = returned value of above function

Answer 2

Try this:
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
self.validateField()
return true
}
// MARK: - Validations
func validateField() -> Bool
{
if (self.isValidEmail(testStr: txtEmail.text!) && strPassword.characters.count > 0 )
{
btn.isUserInteractionEnabled = .true
btn.backgroundColor = .green
return true
}
else
{
btn.isUserInteractionEnabled = .false
btn.backgroundColor = .red
return false
}
}
func isValidEmail(testStr:String) -> Bool {
let emailRegEx = "[A-Z0-9a-z._%+-]+#[A-Za-z0-9.-]+\\.[A-Za-z]{2,}"
let emailTest = NSPredicate(format:"SELF MATCHES %#", emailRegEx)
if (emailTest.evaluate(with: testStr) == false)
{
print("Invalid Email")
return false
}
else
{
return true
}
}