如何创建入职\Walkthrough swift

Question

我正在尝试为第一次登录的用户创建一个欢迎入职的界面，但是没有一个视图在模拟器中游荡，当onboardingVC出现时，我得到的只是一个红色背景。有没有人知道为什么标题、按钮和图片不会出现的问题？

这是我在控制台中得到的消息：

警告:试图在视图不在窗口层次结构中的上显示！全部找到了！！

let holderView: UIView = {
    let view = UIView()
        view.translatesAutoresizingMaskIntoConstraints = true
        view.backgroundColor = .darkGray
        return view
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = UIColor.white
    }
    
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        view.backgroundColor = UIColor.red
        configure()
    }
    
    private func configure() {
        let scrollView = UIScrollView(frame: holderView.bounds)
        holderView.addSubview(scrollView)
        
        let titles = ["Hi","Welcome","real nigga"]
        
        for x in 0..<3 {
            let pageView = UIView(frame: CGRect(x: CGFloat(x) * holderView.frame.size.width, y: 0, width: holderView.frame.size.width, height: holderView.frame.size.height))
            scrollView.addSubview(pageView)
            
            let label = UILabel(frame: CGRect(x: 10, y: 10, width: pageView.frame.size.width-20, height: 120))
            
            let imageView = UIImageView(frame: CGRect(x: 10, y: 10+120+10, width: pageView.frame.size.width-20, height: pageView.frame.size.height - 60 - 130 - 15))
            
            let button = UIButton(frame: CGRect(x: 10, y: pageView.frame.size.height - 60, width: pageView.frame.size.width-20, height: 50))
            
            label.textAlignment = .center
            label.font = UIFont.systemFont(ofSize: 16, weight: .semibold)
            pageView.addSubview(label)
            label.text = titles[x]
            
            imageView.contentMode = .scaleAspectFill
            imageView.image = UIImage(named: "BankCard\(x)")
            pageView.addSubview(imageView)
            
            button.setTitleColor(.red, for: .normal)
            button.backgroundColor = .black
            button.setTitle("Continue", for: .normal)
            if x == 2 {
                button.setTitle("Get Started", for: .normal)
            }
            button.addTarget(self, action: #selector(didTapButton), for: .touchUpInside)
            pageView.addSubview(button)

        }
    }
    
    @objc func didTapButton(_ button: UIButton) {
        
    }

}

Answer 1

“其视图不在窗口层次结构中”您没有将创建的视图添加到主视图尝试使用此视图将子视图添加到主视图

self.view.addSubview(holderView)

另外，别忘了像这样添加holder视图的框架

UIView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height))
    view.translatesAutoresizingMaskIntoConstraints = true

在视图中加载了

   override func viewDidLoad() {
    super.viewDidLoad()
    view.backgroundColor = UIColor.white
    self.view.addSubview(holderView)
}