导航栏中的从大标题到小标题的切换并不流畅iOS 13 [英] Large title to small title switch in navigation bar is not smooth iOS 13, sticky

问题描述

我有一个UINavigationController，其默认值为navigationBar.prefersLargeTitles = true.

I have a UINavigationController with default value of it's navigationBar.prefersLargeTitles = true .

当我push进入新场景时，我将其切换为false，通过将其更改为viewWillDisappear来调用它(DetailsViewController).

I am switching that to false when I push into a new scene lets call it (DetailsViewController), by changing it into the viewWillDisappear .

override func viewWillDisappear(_ animated: Bool) {
   super.viewWillDisappear(animated)
   navigationController?.navigationBar.prefersLargeTitles = false
}

现在在DetailsViewController中，我正在使用willMove(to parent:).

Now in DetailsViewController I am using willMove(to parent:) .

override func willMove(toParent parent: UIViewController?) {
        navigationController?.navigationBar.prefersLargeTitles = true
}

要过渡回大标题.

考虑 iOS 12 是正确的行为，请观察所附的快照，了解 iOS 13 的运行方式和 iOS 12 的运行方式.

Observe the attached snapshots of how iOS 13 doing it with how iOS 12 is doing it, considering iOS 12 is the correct behavior.

iOS 13 :

iOS 12 :

推荐答案

您所做的总是错误的.您应该将导航栏的prefersLargeTitles设置为true一次，再也不要触摸它.

What you're doing was always wrong. You should set prefersLargeTitles to true once for the navigation bar and never touch it again.

更改每个视图控制器对大标题所做的操作的方法是，该视图控制器将其自己的navigationItem(在其viewDidLoad中)设置为具有所需的largeTitleDisplayMode.所以如果第一个v.c. .always，第二个具有.never，一切都会变得顺畅.

The way to change what each view controller does about large titles as it appears is that that view controller sets its own navigationItem (in its viewDidLoad) to have the desired largeTitleDisplayMode. So if the first v.c. has .always and the second has .never everything will be smooth.

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