iOS

iOS – Apple provides screenshot detection notification but not providing direct solution for prevention.

Here I found solution for preventing screenshot taking from the UIView. It’s a simple extension of the UIView that allows to hide it from screen-capturing and also from screen recording. The solution uses ability of UITextField to hide a password from capturing.

	extension UIView {
	func preventScreenshot() {
	DispatchQueue.main.async {
	let field = UITextField()
	field.isSecureTextEntry = true
	self.addSubview(field)
	field.centerYAnchor.constraint(equalTo: self.centerYAnchor).isActive = true
	field.centerXAnchor.constraint(equalTo: self.centerXAnchor).isActive = true
	self.layer.superlayer?.addSublayer(field.layer)
	field.layer.sublayers?.first?.addSublayer(self.layer)
	}
	}
	}

view raw PreventScreenshot.swift hosted with ❤ by GitHub

Usage:

viewSecure.preventScreenshot()

So, when you take screenshot the logic of text field secure entry (password text field) will not allow to take screenshot of that part.

ScrollView Screenshot Prevention

Update: Here is recursive function for preventing screenshot.

	extension UIView {
	func preventScrollViewScreenshotRecursive() {
	guard superview != nil else {
	for subview in subviews {
	subview.preventScrollViewScreenshotRecursive()
	}
	return
	}
	let guardTextField = UITextField()
	guardTextField.backgroundColor = .red
	guardTextField.translatesAutoresizingMaskIntoConstraints = false
	guardTextField.tag = Int.max
	guardTextField.isSecureTextEntry = true
	addSubview(guardTextField)
	guardTextField.isUserInteractionEnabled = false
	sendSubviewToBack(guardTextField)
	layer.superlayer?.addSublayer(guardTextField.layer)
	guardTextField.layer.sublayers?.first?.addSublayer(layer)
	guardTextField.centerYAnchor.constraint(
	equalTo: self.centerYAnchor
	).isActive = true
	guardTextField.centerXAnchor.constraint(
	equalTo: self.centerXAnchor
	).isActive = true
	}
	}

view raw PreventScrollViewScreenshot.swift hosted with ❤ by GitHub

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