swiftui_preview_with_ui_view

HelloWorldView.swift

import UIKit

class HelloWorldView: UIView {
  
    private lazy var title = createTitle()

    override init(frame: CGRect) {
        super.init(frame: frame)
        addSubview(title)
    }

    required init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        title.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            title.centerXAnchor.constraint(equalTo: self.centerXAnchor),
            title.centerYAnchor.constraint(equalTo: self.centerYAnchor),
            title.widthAnchor.constraint(equalTo: self.widthAnchor),
            title.heightAnchor.constraint(equalTo: self.heightAnchor)
        ])
    }
  
    private func createTitle() -> UILabel {
        let view = UILabel(frame: CGRect())
        view.text = "Hello World"
        return view
    }
}