_UITextLayoutCanvasView

SecureLabel.swift

import UIKit

  lazy var hiddenView: UIView = {
    let hiddenView: UIView

    // iOS 14.1 -> _UITextFieldCanvasView
    // iOS 15.0 -> _UITextLayoutCanvasView

    if let klass = NSClassFromString("_UITextFieldCanvasView") as? UIView.Type {
      hiddenView = klass.init()
      hiddenView.layer.perform(Selector(("setDisableUpdateMask:")), with: 0x12)
    } else {
      let textField = UITextField()
      textField.isSecureTextEntry = true

      hiddenView = textField.layer.sublayers?.first?.delegate as! UIView
      hiddenView.subviews.forEach { $0.removeFromSuperview() }
    }

    addSubview(hiddenView)
    hiddenView.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate([
      hiddenView.leftAnchor.constraint(equalTo: leftAnchor),
      hiddenView.rightAnchor.constraint(equalTo: rightAnchor),
      hiddenView.topAnchor.constraint(equalTo: topAnchor),
      hiddenView.bottomAnchor.constraint(equalTo: bottomAnchor)
    ])
    return hiddenView
  }()

  lazy var hiddenLabel: UILabel = {
    let sublabel = UILabel()

    hiddenView.addSubview(sublabel)
    sublabel.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate([
      sublabel.leftAnchor.constraint(equalTo: hiddenView.leftAnchor),
      sublabel.rightAnchor.constraint(equalTo: hiddenView.rightAnchor),
      sublabel.topAnchor.constraint(equalTo: hiddenView.topAnchor),
      sublabel.bottomAnchor.constraint(equalTo: hiddenView.bottomAnchor)
    ])

    return sublabel
  }()

}

@damian-rzeszot thanks for this. how does setDisableUpdateMask play into this & how were you able to figure?

@Joseph-Nathan it is private API, you app won't pass Apple's review

@damian-rzeszot I want to prevent taking navigation bar. Could you give me a hand to resolve this issue? Many thanks!