UIBarButtonItem size displays wrong - ios

Question

I have custom UINavigationBar(for JSQMessagesViewController) with some items. But I have some problems with leftBarButtonItem
func setNavigationBar() {
let screenSize: CGRect = UIScreen.main.bounds
let navBar = UINavigationBar(frame: CGRect(x: 0, y: 28, width: screenSize.width, height: 78))
let navItem = UINavigationItem(title: chatName ?? "chat")
let menuBtn = UIButton(type: .custom)
menuBtn.frame = CGRect(x: 0.0, y: 0.0, width: 78, height: 78)
menuBtn.setImage(UIImage(named: "backButton"), for: .normal)
menuBtn.addTarget(self, action: #selector(back), for: UIControl.Event.touchUpInside)
let menuBarItem = UIBarButtonItem(customView: menuBtn)
let currWidth = menuBarItem.customView?.widthAnchor.constraint(equalToConstant: 78)
currWidth?.isActive = true
let currHeight = menuBarItem.customView?.heightAnchor.constraint(equalToConstant: 78)
currHeight?.isActive = true
navItem.leftBarButtonItem = menuBarItem
navBar.titleTextAttributes = [.font : UIFont(name: "Acrom-Bold", size: 26)!, .foregroundColor : UIColor.white]
navBar.setItems([navItem], animated: false)
navBar.setBackgroundImage(UIImage(), for: .default)
navBar.shadowImage = UIImage()
navBar.backgroundColor = UIColor(displayP3Red: 0, green: 0, blue: 0, alpha: 0.3)
navBar.isTranslucent = true
self.view.addSubview(navBar)
}
But my BackButton looks wrong.
What is the problem with the height of the button?

Answer 1

If a bar button item has a custom view, you must size the width of the custom view using internal autolayout constraints.
But you must not size the height larger than the runtime likes, as you are doing. Delete these lines:
let currHeight = menuBarItem.customView?.heightAnchor.constraint(equalToConstant: 78)
currHeight?.isActive = true