space-ios/iOSClient/Extensions/UIView+Extension.swift

//
//  UIView+Extension.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 14/12/2022.
//  Copyright © 2020 Marino Faggiana. All rights reserved.
//
//  Author Marino Faggiana <marino.faggiana@nextcloud.com>
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
//

import Foundation
import UIKit

extension UIView {

    // Source
    // https://stackoverflow.com/questions/18680028/prevent-screen-capture-in-an-ios-app/67054892#67054892
    //
    // private weak var scrollView: UIScrollView! (it's an outlet)
    // self.view.preventScreenshot(for: self.scrollView)
    //
    func preventScreenshot(for view: UIView) {
        let textField = UITextField()
        textField.isSecureTextEntry = true
        textField.isUserInteractionEnabled = false
        guard let hiddenView = textField.layer.sublayers?.first?.delegate as? UIView else {
            return
        }
        hiddenView.subviews.forEach { $0.removeFromSuperview() }
        hiddenView.translatesAutoresizingMaskIntoConstraints = false
        self.addSubview(hiddenView)
        hiddenView.fillSuperview()
        hiddenView.addSubview(view)
    }
}