Ios UIButton press不调用功能

我是swift新手，创建了一个viewcontroller和一个mainView.swift，其中包含所有样式和ui元素，但是mainView.swift中的按钮不调用我创建的函数。我应该补充一点，所有元素在加载后都会加载，我点击登录按钮，什么都不会发生，我在swift中对视图的层次结构进行了一些研究，但如果没有任何帮助，我们将不胜感激

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)
}
}

---

代码中的问题是loginPressed方法缺少参数。单击按钮时，它将调用您的方法，并作为参数将单击的按钮对象发送到您的方法

但是正在调用的方法的签名与您的loginPressed方法不匹配。应该是这样的

@objc func loginPressed(sender: UIButton!) {  
          print("login Clicked")  
     } 

loginView = login()

---

因为所有动作都是基于superView的框架进行的，所以它是这样的

@objc func loginPressed(sender: UIButton!) {  
          print("login Clicked")  
     } 

loginView = login()

及

其中，元素具有相对于非零值的帧值，因为

let screenSize = UIScreen.main.bounds
screenSize.width/height

---

尽管superView有一个零帧，但会导致所有操作停止

是否有任何错误？完全没有错误，我打开控制台查看我要打印的行是否显示，但没有显示。SPL使用autolayout而不是CgrectAll元素在mainView中。swift作为子视图添加到UIView中，即使使用参数，按下按钮仍不显示在屏幕中output@AAM尝试给loginViewtry一个框架。loginButton.addTargetself，操作：selectorloginPressedsender:，for:。TouchUpInside发件人参数不是强制性的，如果指定了该参数，则类型在Swift 3+中永远不会是IUO。此外，最好将loginButton.layer.addSublayergradient替换为loginButton.layer.insertSublayergradient，位置：0