隐藏导航栏底部的那条线

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NavigationBar 的底部有一条线，对其隐藏或者显示，可以利用以下的扩展来实现

extension UINavigationBar {    func hideBottomHairline() {        let navigationBarImageView = hairlineImageViewInNavigationBar(self)        navigationBarImageView?.hidden = true    }    func showBottomHairline() {        let navigationBarImageView = hairlineImageViewInNavigationBar(self)        navigationBarImageView?.hidden = false    }    private func hairlineImageViewInNavigationBar(view: UIView) -> UIImageView? {        if let view = view as? UIImageView where view.bounds.height <= 1.0 {        return view    }        if let subviews = view.subviews as? [UIView] {            for subview in subviews {                if let imageView = hairlineImageViewInNavigationBar(subview) {                    return imageView                }            }        }        return nil    }}

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