NavigationBarColor.swift

extension UINavigationBar {
    
    var barColor: UIColor? {
        get { return self.backgroundView.backgroundColor }
        set { self.backgroundView.backgroundColor = newValue }
    }
    
    private var backgroundView: UIView {
        return self.subviews.filter { $0 is TransparentView }.first ?? {
            let statusBarHeight = UIApplication.shared.isStatusBarHidden ? 20 : UIApplication.shared.statusBarFrame.height
            $0.frame = self.bounds
            $0.frame.origin.y -= statusBarHeight
            $0.frame.size.height += statusBarHeight
            self.insertSubview($0, at: 0)
            return $0
        }(TransparentView())
    }
    
}

class TransparentView: UIView {
    
    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        let view = super.hitTest(point, with: event)
        if view == self { return nil }
        return view
    }
    
}