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Block Screenshots in iOS

E13EA3.gif

Use SecureField


import UIKit

class ViewController: UIViewController {
private lazy var screenshotBlockLabel: UILabel = {
let label = UILabel()
label.text = "No Screenshots ❌"
label.textAlignment = .center
return label
}()

private lazy var tableView: UITableView = {
let tableView = UITableView()
tableView.dataSource = self
tableView.delegate = self
tableView.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
return tableView
}()

override func viewDidLoad() {
super.viewDidLoad()
setupSecureView()
}

private func setupSecureView() {
guard let secureView = SecureField().secureContainer else { return }

view.addSubview(screenshotBlockLabel)
screenshotBlockLabel.pinEdges()

secureView.addSubview(tableView)
tableView.pinEdges()

view.addSubview(secureView)
secureView.pinEdges()
}
}

extension ViewController: UITableViewDataSource, UITableViewDelegate {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
5
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = "Try to screenshot \(indexPath)"
return cell
}
}

class SecureField: UITextField {
weak var secureContainer: UIView? {
let secureView = subviews.first { String(describing: type(of: $0)).contains("CanvasView") }
secureView?.translatesAutoresizingMaskIntoConstraints = false
secureView?.isUserInteractionEnabled = true
return secureView
}

override var canBecomeFirstResponder: Bool { false }
override func becomeFirstResponder() -> Bool { false }

override init(frame: CGRect) {
super.init(frame: .zero)
isSecureTextEntry = true
translatesAutoresizingMaskIntoConstraints = false
}

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

extension UIView {
func pinEdges(to superview: UIView? = nil) {
guard let superview = superview ?? self.superview else { return }
translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
topAnchor.constraint(equalTo: superview.topAnchor),
leadingAnchor.constraint(equalTo: superview.leadingAnchor),
trailingAnchor.constraint(equalTo: superview.trailingAnchor),
bottomAnchor.constraint(equalTo: superview.bottomAnchor)
])
}
}

References

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