Determine if UIView is visible to the user?

Question

is it possible to determine whether my UIView is visible to the user or not?

My View is added as subview several times into a Tab Bar

Answer 1

Tested solution.

func isVisible(_ view: UIView) -> Bool {
    if view.isHidden || view.superview == nil {
        return false
    }

    if let rootViewController = UIApplication.shared.keyWindow?.rootViewController,
        let rootView = rootViewController.view {

        let viewFrame = view.convert(view.bounds, to: rootView)

        let topSafeArea: CGFloat
        let bottomSafeArea: CGFloat

        if #available(iOS 11.0, *) {
            topSafeArea = rootView.safeAreaInsets.top
            bottomSafeArea = rootView.safeAreaInsets.bottom
        } else {
            topSafeArea = rootViewController.topLayoutGuide.length
            bottomSafeArea = rootViewController.bottomLayoutGuide.length
        }

        return viewFrame.minX >= 0 &&
               viewFrame.maxX <= rootView.bounds.width &&
               viewFrame.minY >= topSafeArea &&
               viewFrame.maxY <= rootView.bounds.height - bottomSafeArea
    }

    return false
}