iOS 11 prefersLargeTitles not expanding after orientation change - ios

Question

I've implemented the iOS 11 feature prefersLargeTitles and it works just fine. Portrait mode is working as expected:
I understand the large title will always stay collapsed (small) in landscape mode and that's fine to me. The problem is when I try to change to landscape and then again to portrait, the large title should be expanded (big) by default back in portrait mode, but it won't until I scroll down a bit:
My code looks quite simple:
if #available(iOS 11.0, *) {
navigationController?.navigationBar.prefersLargeTitles = true
navigationItem.largeTitleDisplayMode = .always
}
I also tried using different values on tableView.contentInsetAdjustmentBehavior, nothing changed. I'm kind of solving it by now scrolling down the table programmatically after orientation changes, but I think that's just a (not very nice) workaround.
Is that supposed to be working as expected? Is it something left in my implementation? Is there a better workaround to this?

Answer 1

I faced the same issue. This worked for me.
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
navigationItem.largeTitleDisplayMode = .always
coordinator.animate(alongsideTransition: { (_) in
self.coordinator?.navigationController.navigationBar.sizeToFit()
}, completion: nil)
}

Answer 2

One approach could be save the maximum navigation bar height, and set it during rotation.
Something like this:
var maximumHeight: CGFloat = 0
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
super.viewWillTransition(to: size, with: coordinator)
guard let navigationController = navigationController else {
return
}
if maximumHeight < navigationController.navigationBar.frame.height {
maximumHeight = navigationController.navigationBar.frame.height
}
coordinator.animate(alongsideTransition: { (_) in
navigationController.navigationBar.frame.size.height = self.maximumHeight
}, completion: nil)
}
In landscape, the system knows that it must change its size, so you don't have to worry about it.
#rassar #twofish

Answer 3

iOS 16
First set the PrefersLargeTitles to true either on ViewDidLoad() or on the NavigationBar in the storyboard.
Then on the Navigation Controller's rootController add this:
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
super.viewWillTransition(to: size, with: coordinator)
coordinator.animate { (_) in
self.navigationController?.navigationBar.sizeToFit()
}
}