iOS 11 prefersLargeTitles not updating until scroll

Question

I implemented a basic UIViewController with a UITableView that\'s wrapped in a UINavigationController. I set prefersLargeTitles to true:

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Answer 1

I just had this same issue and, in my case, it turns out that the Storyboard structure that was working in iOS 10 with Swift 3 (and also works with iOS 11 with Swift 3) was causing the issue on iOS 11 with Swift 4.

To elaborate:

I had a regular UIViewController in my storyboard that I had set to a UINavigationController subclass (my hierarchy is similar to yours, with UITabBarController subclass → UINavigationController subclass → UITableViewController subclass).

In iOS 10, this worked fine.

In iOS 11, this also works fine when you run the existing Swift 3 app.

However, with the Swift 4 app, running on iOS 11, I was seeing the same symptoms you described (large titles only appear when you pull/scroll the view down).

To fix, I replaced the UIViewController-based elements in the Storyboard with actual UINavigationController instances (which contain a UINavigationBar explicitly in the Storyboard – I have a hunch this is where the crux of the issue stems from, as the UIViewController instances didn’t have that element explicitly declared within the Storyboard).

Anyway, that fixed the issue for me.

I’ll file radar as this looks like a Swift 4-based regression as, for me, it works both in iOS 10 with Swift 3 and in iOS 11 with Swift 3.