ios - 无法创建class的实例，导致应用崩溃

Question

解决方案-信贷Sanzio Angeli，用过lazy var尝试访问pageIndex以更新页面指示器，我尝试创建一个具有pageIndex的public属性的类的实例，但是当我尝试这样做会使应用程序崩溃时，请问有人可以建议在哪里我做错了，如果我不全局声明实例，但在方法内部，奇怪的是，应用程序不会崩溃
我得到的错误-Thread 1: EXC_BAD_ACCESS (code=2, address=0x7ffeeebccea8)下面是我要创建其实例的类，之后是我要通过在顶部创建全局实例来调用它的类，我正尝试在func moveToNext()中使用它

import UIKit

class ContentViewController: UIViewController {
    let contentDesign = ContentView()
    var pageIndex = 0
    var pageHeading = ""
    var pageContent = ""
    var pageImage = ""
    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(contentDesign)
        contentDesign.pagerContent.text = pageContent
        contentDesign.pagerHeader.text = pageHeading
        contentDesign.pagerImage.image = UIImage(named: pageImage)
        // Do any additional setup after loading the view.
    }

}

////// ---------

class MasterView: UIViewController {
    
    var container = UIView()
    var lowerCotainer = UIView()
    var pageNumbering: UIPageControl = UIPageControl()
    var nextButton = UIButton()
    var skipButton = UIButton()
    var pageController = PageViewController()

    **var content = ContentViewController()**

    override func viewDidLoad() {
           super.viewDidLoad()
      
           commonInit()
       }
    
    func commonInit()
    {
        container.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(container)
        container.widthAnchor.constraint(equalToConstant: UIScreen.main.bounds.width).isActive = true
        container.heightAnchor.constraint(equalToConstant: UIScreen.main.bounds.height * 0.6).isActive = true

    }

    @objc func moveToNext()  {
   //  let index = pageController.currentIndex
        let index = content.pageIndex
        pageNumbering.currentPage = index + 1
                   print(index)
                   switch index {
                   case 0...1:

                       pageController.forwardPage()


                   case 2:
            self.view.window?.rootViewController?.dismiss(animated: true, completion: nil)
                    
                   default:
                       break

                   }
    }

}

在 var pagerHeader = UILabel()的另一个类中，应用程序崩溃的地方很奇怪

import UIKit

class ContentView: UIView {
    
    var pagerImage = UIImageView()
    var pagerHeader = UILabel()
    var pagerContent = UILabel()
   let master = MasterView()
    override init(frame: CGRect) {
        super.init(frame: frame)
        commonInit()
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    func commonInit()
    {
        pagerImage.translatesAutoresizingMaskIntoConstraints = false
        addSubview(pagerImage)
       
    }

}

Answer 1

在使用多重宇宙之后:

lazy var content = ContentViewController()

代替:

var content = ContentViewController()

已解决问题