UIButton press wont call function - ios

Question

I am new to swift and have created a viewcontroller and a mainView.swift which holds all the styling and ui elements however the button in the mainView.swift doesn't call the function i have created i should add that all the elements load in fine its just after they load and i tap the login button nothing happens , i did some research into the hierarchy of views in swift however noting helped solve the issue , any help would be appreciated
MainView.swift
import Foundation
import UIKit
import PureLayout
class login: UIView {
var shouldSetupConstraints = true
var logoImageContainer = UIView()
var logoImage = UIImageView(image: UIImage(named: "logo"))
var loginButton = UIButton()
var registerButton = UIButton()
let screenSize = UIScreen.main.bounds
let gradient = CAGradientLayer()
override init(frame: CGRect) {
super.init(frame: frame)
logoImage.center = CGPoint(x: screenSize.width/2, y:0)
logoImage.alpha = 0.0
self.addSubview(logoImage)
loginButton.frame = CGRect(x: screenSize.width/14, y: screenSize.height/1.35, width: 320, height: 50)
gradient.frame = loginButton.bounds
gradient.colors = [UIColor(red: (0/255.0), green: (114/255.0), blue: (255/255.0), alpha: 1).cgColor , UIColor(red: (0/255.0), green: (198/255.0), blue: (255/255.0), alpha: 1).cgColor]
gradient.startPoint = CGPoint(x: 0, y: 0)
gradient.endPoint = CGPoint(x: 1, y: 0)
gradient.cornerRadius = 4
loginButton.layer.addSublayer(gradient)
loginButton.setTitle("SIGN IN", for: .normal)
loginButton.titleLabel?.font = UIFont(name: "HelveticaNeue-medium", size: 30)
loginButton.titleLabel?.textAlignment = .center
loginButton.alpha = 0.0
loginButton.addTarget(self, action: #selector(loginPressed), for: .touchUpInside)
self.addSubview(loginButton)
registerButton.frame = CGRect(x: screenSize.width/14, y: screenSize.height/1.175, width: 320, height: 50)
registerButton.setTitle("Create Account", for: .normal)
registerButton.setTitleColor(UIColor.gray, for: UIControlState.normal)
registerButton.titleLabel?.font = UIFont(name: "HelveticaNeue-medium", size: 24)
registerButton.titleLabel?.textAlignment = .center
registerButton.alpha = 0.0
self.addSubview(registerButton)
UIView.animate(withDuration: 1.0, animations: { () -> Void in
self.loginButton.alpha = 1.0
self.registerButton.alpha = 1.0
self.logoImage.alpha = 1.0
self.logoImage.center = CGPoint(x: self.screenSize.width/2, y:self.screenSize.height/2.5)
})
}
#objc func loginPressed() {
print("press")
/* UIView.animate(withDuration: 1.0, animations: { () -> Void in
self.loginButton.center = CGPoint(x: self.screenSize.width/14, y: self.screenSize.height/1.175)
self.registerButton.alpha = 0.0
self.registerButton.center = CGPoint(x: self.screenSize.width/2, y:self.screenSize.height/1)
self.logoImage.center = CGPoint(x: self.screenSize.width/2, y:self.screenSize.height/1.5)
}) */
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
override func updateConstraints() {
if(shouldSetupConstraints) {
// AutoLayout constraints
shouldSetupConstraints = false
}
super.updateConstraints()
}
}
MainViewController.swift
class MainViewController: UIViewController {
var loginView: login!
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = UIColor(red: (255/255.0), green: (255/255.0), blue: (255/255.0), alpha: 1)
loginView = login()
loginView.isUserInteractionEnabled = true
self.view.addSubview(loginView)
}
}

Answer 1

the problem in your code is your loginPressed method is missing a parameter. When a button is clicked it will call your method and as parameter it will send a button object which is clicked to your method.
But the signature of method being called and your loginPressed method is not matching. It should be like this
#objc func loginPressed(sender: UIButton!) {
print("login Clicked")
}

Answer 2

Since all actions work on the basis of the superView's frame making it like this
loginView = login()
and
loginButton.frame = CGRect(x: screenSize.width/14, y: screenSize.height/1.35, width: 320, height: 50)
where elemnts have there frame values relative to non-zero value because of
let screenSize = UIScreen.main.bounds
screenSize.width/height
despite the superView has a zero frame , will cause all actions to drop