Ошибка:
2018-05-13 01: 32: 25.577503-0400 LoginScreen [2606: 70991] *** Завершение работы приложения из-за необработанного исключения «NSGenericException», причина: «Невозможно активировать ограничение с помощью якорей и , поскольку они не имеют общего предка. Указывает ли ограничение или его привязки на элементы в разных иерархиях представления? Это незаконно. '
Исходный код:
import UIKit
class ViewController: UIViewController {
let emailTextField: UITextField = {
let e = UITextField()
let attributedPlaceHolder = NSAttributedString(string: "Email", attributes:
[NSAttributedStringKey.foregroundColor: UIColor.white])
e.attributedPlaceholder = attributedPlaceHolder
e.backgroundColor = GREEN_THEME
return e
}()
let passwordTextField: UITextField = {
let p = UITextField()
let attributedPlaceHolder = NSAttributedString(string: "Password", attributes:
[NSAttributedStringKey.foregroundColor: UIColor.white])
p.attributedPlaceholder = attributedPlaceHolder
p.backgroundColor = GREEN_THEME
return p
}()
let loginButton: UIButton = {
let l = UIButton(type: .system)
l.setTitleColor( .white, for: .normal)
l.setTitle("Log In", for: .normal)
l.backgroundColor = GREEN_THEME
return l
}()
let forgotPasswordButton: UIButton = {
let f = UIButton(type: .system)
f.setTitleColor( .white, for: .normal)
f.setTitle("Forgot Password?", for: .normal)
f.backgroundColor = GREEN_THEME
return f
}()
let haveAccountButton: UIButton = {
let color = UIColor(red: 89/255, green: 156/255, blue: 120/255, alpha: 1 )
let font = UIFont.systemFont(ofSize: 16)
let h = UIButton(type: .system)
h.backgroundColor = GREEN_THEME
let attributedTitle = NSMutableAttributedString(string:
"Don't have an accoun?", attributes:
[NSAttributedStringKey.foregroundColor: color, NSAttributedStringKey.font: font ])
attributedTitle.append(NSAttributedString(string: "Sign Up", attributes: [NSAttributedStringKey.foregroundColor: UIColor.white,
NSAttributedStringKey.font: font ]))
h.setAttributedTitle(attributedTitle, for: .normal)
return h
}()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = GREEN_THEME
setupTextFieldComponents()
setupLoginButton()
}
fileprivate func setupTextFieldComponents(){
setupEmailField()
setupPasswordField()
setupHaveAccountButton()
setupForgotPasswordButton()
}
override var preferredStatusBarStyle: UIStatusBarStyle{
return .lightContent
}
fileprivate func setupEmailField(){
view.addSubview(emailTextField)
emailTextField.translatesAutoresizingMaskIntoConstraints = false
emailTextField.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 16).isActive = true
emailTextField.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 24).isActive = true
emailTextField.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -24).isActive = true
emailTextField.heightAnchor.constraint(equalToConstant: 30).isActive = true
emailTextField.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
}
fileprivate func setupPasswordField(){
view.addSubview(passwordTextField)
passwordTextField.translatesAutoresizingMaskIntoConstraints = false
passwordTextField.topAnchor.constraint(equalTo: emailTextField.bottomAnchor, constant: 8).isActive = true
passwordTextField.leftAnchor.constraint(equalTo: emailTextField.leftAnchor, constant: 0).isActive = true
passwordTextField.rightAnchor.constraint(equalTo: emailTextField.rightAnchor, constant: 0).isActive = true
passwordTextField.heightAnchor.constraint(equalToConstant: 30).isActive = true
}
fileprivate func setupLoginButton(){
view.addSubview(loginButton)
loginButton.translatesAutoresizingMaskIntoConstraints = false
loginButton.topAnchor.constraint(equalTo: passwordTextField.bottomAnchor, constant: 8).isActive = true
loginButton.leftAnchor.constraint(equalTo: passwordTextField.leftAnchor, constant: 0).isActive = true
loginButton.rightAnchor.constraint(equalTo: passwordTextField.rightAnchor, constant: 0).isActive = true
loginButton.heightAnchor.constraint(equalToConstant: 30).isActive = true
}
fileprivate func setupForgotPasswordButton(){
view.addSubview(forgotPasswordButton)
forgotPasswordButton.translatesAutoresizingMaskIntoConstraints = false
forgotPasswordButton.topAnchor.constraint(equalTo: loginButton.bottomAnchor, constant: 8).isActive = true
forgotPasswordButton.leftAnchor.constraint(equalTo: loginButton.leftAnchor, constant: 0).isActive = true
forgotPasswordButton.rightAnchor.constraint(equalTo: loginButton.rightAnchor, constant: 0).isActive = true
forgotPasswordButton.heightAnchor.constraint(equalToConstant: 30).isActive = true
}
fileprivate func setupHaveAccountButton(){
view.addSubview(haveAccountButton)
haveAccountButton.translatesAutoresizingMaskIntoConstraints = false
haveAccountButton.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -8).isActive = true
haveAccountButton.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 12).isActive = true
haveAccountButton.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -12).isActive = true
haveAccountButton.heightAnchor.constraint(equalToConstant: 30).isActive = true
}
}