iOS 11更喜欢大型标题直到滚动才更新

我用包装在UINavigationController中的UITableView实现了一个基本的UIViewController。我将 prefersLargeTitles 设置为true：

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

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    navigationController?.navigationBar.prefersLargeTitles = true
    navigationItem.title = "Coffees"
}

但是，标题一直很小，直到我滚动视图为止，此时它会放大。我尝试将调用移到创建UINavigationController的位置，但是没有任何效果。我确定在设置 prefersLargeTitles 时，navigationController不会为零。

However, the title stays small until I scroll the view, at which point it enlarges. I tried moving that call to where I create the UINavigationController, but there was no effect. I am sure the navigationController is not nil when I set prefersLargeTitles.

我是否应该在其他地方更新该属性？还是应该提交雷达？

Should I be updating that property elsewhere? Or should I file a Radar?

更新：

如果我的视图包含 UITableView 或本身就是 UITableViewController

This only seems to happen if my view contains a UITableView or is itself a UITableViewController