iOS 11 navigation bar height customizing

Question

Now in iOS 11, the sizeThatFits method is not called from UINavigationBar subclasses. Changing the frame of UINavigationBar causes gli

Answer 1

This is what I use. It works for regular content (44.0 px) if you use UISearchBar as title or other views that modify the size of the bar content, you must update the values accordingly. Use this at your own risk since it might brake at some point.

This is the navbar with 90.0px height hardcoded, working on both iOS 11 and older versions. You might have to add some insets to the UIBarButtonItem for pre iOS 11 to look the same.

class NavBar: UINavigationBar {

    override init(frame: CGRect) {
        super.init(frame: frame)

        if #available(iOS 11, *) {
            translatesAutoresizingMaskIntoConstraints = false
        }
    }

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

    override func sizeThatFits(_ size: CGSize) -> CGSize {
        return CGSize(width: UIScreen.main.bounds.width, height: 70.0)
    }

    override func layoutSubviews() {
        super.layoutSubviews()

        guard #available(iOS 11, *) else {
            return
        }

        frame = CGRect(x: frame.origin.x, y:  0, width: frame.size.width, height: 90)

        if let parent = superview {
            parent.layoutIfNeeded()

            for view in parent.subviews {
                let stringFromClass = NSStringFromClass(view.classForCoder)
                if stringFromClass.contains("NavigationTransition") {
                    view.frame = CGRect(x: view.frame.origin.x, y: frame.size.height - 64, width: view.frame.size.width, height: parent.bounds.size.height - frame.size.height + 4)
                }
            }
        }

        for subview in self.subviews {
            var stringFromClass = NSStringFromClass(subview.classForCoder)
            if stringFromClass.contains("BarBackground") {
                subview.frame = CGRect(x: 0, y: 0, width: self.frame.width, height: 90)
                subview.backgroundColor = .yellow
            }

            stringFromClass = NSStringFromClass(subview.classForCoder)
            if stringFromClass.contains("BarContent") {
                subview.frame = CGRect(x: subview.frame.origin.x, y: 40, width: subview.frame.width, height: subview.frame.height)

            }
        }
    }
}

And you add it to a UINavigationController subclass like this:

class CustomBarNavigationViewController: UINavigationController {

    init() {
        super.init(navigationBarClass: NavBar.self, toolbarClass: nil)
    }

    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    }

    override init(rootViewController: UIViewController) {
        super.init(navigationBarClass: NavBar.self, toolbarClass: nil)

        self.viewControllers = [rootViewController]
    }

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

}