iOS. UINavigationBar with custom height -> vertically center titleView & barButtonItems - ios

Question

I have a custom UINavigationBar:
class NavBar: UINavigationBar {
override init(frame: CGRect) {
super.init(frame: frame)
self.commonInit()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self.commonInit()
}
private func commonInit() {
self.barTintColor = .orange
}
override func sizeThatFits(_ size: CGSize) -> CGSize {
return CGSize(width: UIScreen.main.bounds.width, height: 66)
}
}
When I set titleView and/or barButtonItems they are not vertically centered:
class ViewController : UIViewController {
override func viewDidLoad() {
self.viewDidLoad()
self.edgesForExtendedLayout = []
let searchField = UITextField(frame: CGRect(x: 0, y: 0, width: 100, height: 44))
searchField.backgroundColor = .green
self.navigationItem.titleView = searchField
}
}
Result:
How can I vertically center textView & barButtonItems inside UINavigationBar when it's height is not default?
I've tried setting textView's bounds, frame - does not work.
With:
let view = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 44))
view.backgroundColor = .green
let searchField = UITextField(frame: CGRect(x: 0, y: -20, width: 100, height: 44))
searchField.backgroundColor = .red
view.addSubview(searchField)
self.navigationItem.titleView = view
I can change the position of the searchField, but it seems like I am doing it wrong.
Can I somehow set UINavigationBar 'padding'/'margin' or textView & barButtonItem offset in the NavBar class?

Answer 1

You're basically hacking UINavigationBar right now that's why I wouldn't expect stable behaviour from it. Apple is discouraging your from doing that. Even in the Apple example of extended UINavBar they just adding another view and make transition between bar and view seamless. You can also try
setTitleVerticalPositionAdjustment(_:for:)
method but I believe it only affects title and not tab bar items. I would use apple solution to avoid unexpected issues or create custom nav bar without subclassing UINavBar.