大标题最初在推送后折叠 [英] Large title is initially collapsed after push

问题描述

我遇到一个奇怪的问题:

I ran into a strange problem:

• 我有两个视图控制器-列表和详细信息.
• 当我从列表"中按详细信息"时，导航栏处于折叠模式.
• 要使标题显得较大，我必须向下滚动.

ListViewController:

ListViewController:

...
override func viewDidLoad() {
    super.viewDidLoad()

    setupNavigationBar()
}

private func setupNavigationBar() {
    navigationController?.navigationBar.prefersLargeTitles = true
    navigationItem.largeTitleDisplayMode = .never
}
...

DetailViewController:

DetailViewController:

...
override func viewDidLoad() {
    super.viewDidLoad()

    setupNavigationBar()
}

private func setupNavigationBar() {
    title = "Bangkok ⇄ Phuket"
    navigationController?.navigationBar.prefersLargeTitles = true
    navigationItem.largeTitleDisplayMode = .always
}
...

经过一番调查，我发现该错误仅在我在标题中放入某些字符时出现:

After some investigation, I found out that the bug oocurs only when I put certain characters in the title:

• 标题为曼谷→普吉岛"时，一切按预期进行
• 当标题为曼谷⇄普吉岛"时，被推送的控制者的标题将被折叠

你们知道标题中字符的限制是什么，或者有什么解决方法的想法吗?谢谢您的帮助，不胜感激

Do you guys know what are the restrictions for characters in title, or any ideas how to solve it? Thank you, any help much appreciated

推荐答案

使用navigationController?.navigationItem.largeTitleDisplayMode = .always代替navigationItem.largeTitleDisplayMode = .always始终为我解决了该问题.

Use navigationController?.navigationItem.largeTitleDisplayMode = .always instead of navigationItem.largeTitleDisplayMode = .always fixed the issue for me.

navigationController?.navigationBar.prefersLargeTitles = true
navigationController?.navigationItem.largeTitleDisplayMode = .always

此问题表明viewController的navigationController.navigationItem和self.navigationItem之间存在差异.请注意使用它.

This issue indicates that there are differences between navigationController.navigationItem and self.navigationItem of viewController. Be aware on using it.

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