SecureImageView.swift

import React
import UIKit

class SecureImageView: UIView {
  @objc var url: String = "" {
    didSet {
      do {
        let imageUrl = URL(string: url)
        let data = try Data(contentsOf: imageUrl!)
        let image = UIImage(data: data)
        
        imageView.image = image
        
        let imageWidth = image!.size.width
        let imageHeight = image!.size.height
        let viewWidth = UIScreen.main.bounds.width
        let ratio = viewWidth / imageWidth
        let scaledHeight = imageHeight * ratio
        
        imageView.frame = CGRect(x: 0, y: 0, width: viewWidth, height: scaledHeight)
        self.frame = CGRect(x: 0, y: 0, width: viewWidth, height: scaledHeight)
        
        let field = UITextField()
        field.isSecureTextEntry = true
        imageView.addSubview(field)
        
        imageView.layer.superlayer?.addSublayer(field.layer)
        field.layer.sublayers?.first?.addSublayer(imageView.layer)
      } catch {
        print(error)
      }
    }
  }
  
  var imageView: UIImageView!
  
  override init(frame: CGRect) {
    super.init(frame: frame)
    setupView()
  }
  
  required init?(coder: NSCoder) {
    super.init(coder: coder)
    setupView()
  }
  
  private func setupView() {
    imageView = UIImageView()
    imageView.contentMode = .scaleAspectFit
    self.addSubview(imageView)
  }
}