import BYCustomTextField
        .
        .
    let emailTextField = BYTextField(placeholder: "E-mail", alertMessage: "Lütfen geçerli bir e-mail adresi girin.", validMessage: "Geçerli e-mail adresi.", characters: ["@", "."])
    emailTextField.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(emailTextField)
    NSLayoutConstraint.activate([
        emailTextField.widthAnchor.constraint(equalToConstant: 350)
        emailTextField.centerXAnchor.constraint(equalTo: view.centerXAnchor)
        emailTextField.centerYAnchor.constraint(equalTo: view.centerYAnchor)
   ])

    import BYCustomTextFieldSwiftUI
            .
            .
    @State var text: String = ""
            .
            .
    BYTextFieldSwiftUI(text: $text, placeholder: "E-mail", alertText: "Lütfen geçerli bir e-mail girin.", validText: "Geçerli email.", characters: ["@", "."], textColor: Color.black, leftIcon: "person.fill", leftIconColor: Color.gray)

import BYCustomTextField
        .
        .
    let passwordTextField = BYSecurityTextField(placeHolder: "Password", alertMessage: "Şifreniz en az 6  haneli olmalı.", validMessage: "Geçerli şifre.", minCharacterCount: 6)
    passwordTextField.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(passwordTextField)
    NSLayoutConstraint.activate([
        passwordTextField.widthAnchor.constraint(equalToConstant: 350)
        passwordTextField.centerXAnchor.constraint(equalTo: view.centerXAnchor)
        passwordTextField.centerYAnchor.constraint(equalTo: view.centerYAnchor)
   ])

    import BYCustomTextFieldSwiftUI
            .
            .
    @State var text: String = ""
            .
            .
    BYSecurityTextFieldSwiftUI(text: $text1, placeholder: "Password", alertText: "Şifreniz en az 5 haneli olmalıdır.", validText: "Geçerli şifre.", characterCount: 5, textColor: Color.black, leftIcon: "lock.fill", leftIconColor: Color.gray)

import BYCustomTextField
        .
        .
    let emailUnderlineTextField = BYUnderlineTextField(leftIcon: UIImage(systemName: "person.fill") ?? UIImage(), placeholder: "E-mail", alertMessage: "Lütfen geçerli bir e-mail adresi girin.", validMessage: "Geçerli e-mail adresi.", underlineColor: .black, characters: ["@", "."])
    emailUnderlineTextField.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(emailUnderlineTextField)
    NSLayoutConstraint.activate([
        emailUnderlineTextField.widthAnchor.constraint(equalToConstant: 350)
        emailUnderlineTextField.centerXAnchor.constraint(equalTo: view.centerXAnchor)
        emailUnderlineTextField.centerYAnchor.constraint(equalTo: view.centerYAnchor)
   ])

    import BYCustomTextFieldSwiftUI
            .
            .
    @State var text: String = ""
            .
            .
    BYUnderlineTextFieldSwiftUI(text: $text2, placeholder: "E-mail", alertText: "Lütfen geçerli bir e-mail girin.", validText: "Geçerli email.", characters: ["@", "."], textColor: Color.black, underLineColor: Color.gray, leftIcon: "person.fill")

import BYCustomTextField
        .
        .
    let passwordUnderlineTextField = BYUnderlineSecurityTextField(leftIcon: UIImage(systemName: "key.horizontal.fill") ?? UIImage(), placeholder: "Password", alertMessage: "Şifreniz en az 6  haneli olmalı.", validMessage: "Geçerli şifre.", underlineColor: .black, minCharacterCount: 6)
    passwordUnderlineTextField.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(passwordUnderlineTextField)
    NSLayoutConstraint.activate([
        passwordUnderlineTextField.widthAnchor.constraint(equalToConstant: 350)
        passwordUnderlineTextField.centerXAnchor.constraint(equalTo: view.centerXAnchor)
        passwordUnderlineTextField.centerYAnchor.constraint(equalTo: view.centerYAnchor)
   ])

    import BYCustomTextFieldSwiftUI
            .
            .
    @State var text: String = ""
            .
            .
    BYUnderlineSecurityTextFieldSwiftUI(text: $text3, placeholder: "Password", alertText: "Şifreniz en az 5 haneli olmalıdır.", validText: "Geçerli şifre.", minCharacterCount: 5, textColor: Color.black, underLineColor: Color.gray, leftIcon: "lock.fill")

    class ViewController: UIViewController, UITextFieldDelegate {
    
    let customTextField = BYTextField(placeholder: "E-mail", alertMessage: "Lütfen geçerli bir e-mail adresi girin.", validMessage: "Geçerli e-mail adresi.", characters: ["@", "."])

    override func viewDidLoad() {
        super.viewDidLoad()
        
        view.addSubview(customTextField)
        customTextField.delegate = self
        
        customTextField.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            customTextField.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            customTextField.centerYAnchor.constraint(equalTo: view.centerYAnchor),
            customTextField.widthAnchor.constraint(equalToConstant: 250),
        ])
    }
    
    func textFieldDidBeginEditing(_ textField: UITextField) {
        print("Kullanıcı giriş yapmaya başladı")
    }
    
    func textFieldDidEndEditing(_ textField: UITextField) {
        print("Kullanıcı giriş yapmayı bitirdi")
    }
    
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }
}