CustomView

CustomView.swift

import UIKit

class CustomView: UIView {

  //Override the init() constructor so that you can call the function loadView()
  override init(frame: CGRect) {
    super.init(frame: frame)
    loadView()
  }
  
  // Override the requiered constructor
  required init?(coder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }
  
  func loadView() {
    // Bundle contains subfolders so that you can get a reference to the xib file
    let bundle = Bundle(for: CustomView.self)
    // Create an instance of the .xib indicating its bundle
    let nib = UINib(nibName: "CustomView", bundle: bundle)
    // Instantiate the view and and assign the owner, with is the current class
    if let view = nib.instantiate(withOwner: self).first as? UIView {
      view.frame = bounds
      // Add the instantiated view to the current view
      addSubview(view)
    }
  }
}