blocks|key|2752175|text|我已经为你的问题提出了一个小小的申请。你可以到达吉特布的项目。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2752176|透明NavigationBar用于iOS11|offset|length|2752177|注意:当滚动时，您必须使用UINavigationBar的颜色。|2752178|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/yillars/transparent-navigation-bar-ios11^0|0|0|M|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

I've made a small application for your issue. You can reach the project on Github.

<a href="https://github.com/yillars/transparent-navigation-bar-ios11" rel="nofollow noreferrer">Transparent NavigationBar for iOS11</a>

Note: You must use a color for UINavigationBar when scrolling up.

blocks|key|2752148|text|该帐户已被Stack+overflow团队删除。所以我用我的另一个ID在这里评论。我已经向苹果报告了这个问题，他们要求我提供一个项目，我做到了，但苹果没有发表更多评论。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2752149|entityMap^0|5|E|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

The account has been deleted by <code>Stack overflow</code> team. So I use my another ID to comment here. 
I have reported the issue to Apple，they asked me to provide a project and I did, but no more further comment from Apple.

blocks|key|2752180|text|在NavigationController的NavigationsBar+(而不是ViewControllers+Top+)下设置您的ViewControllers+Top约束。它应该能工作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2752181|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Make your TableView Top constraint right under NavigationController's NavigationsBar, not ViewControllers Top. It should work

blocks|key|2791103|text|您应该在viewDidLoad()中添加下面一行|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2791104|self.navigationController?.navigationBar.prefersLargeTitles+=+true
navigationItem.hidesSearchBarWhenScrolling+=+false|code-block|syntax|javascript|2791105|或者您可以实现viewForHeaderInSection方法的UITableViewDataSource|offset|length|style|CODE|2791106|func+tableView(_+tableView:+UITableView,+viewForHeaderInSection+section:+Int)+->+UIView?+
++++{
++++++++++++let+search+=+UISearchController(searchResultsController:+nil)
++++++++++++search.searchResultsUpdater+=+self
++++++++++++return+search.searchBar
++++}|2791107|链接查看屏幕截图1。+链接查看屏幕截图2。|2791108|entityMap|0|LINK|mutability|MUTABLE|url|https://i.stack.imgur.com/qruOX.png|1|https://i.stack.imgur.com/EOUl9.png^0|0|0|7|M|W|L|0|0|0|A|0|B|A|1|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|12|8|@$I|13|J|14|K|L]|$I|15|J|16|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|18|8|@]|9|@$I|19|J|1A|1|1B]|$I|1C|J|1D|1|1E]]|A|$]]|$1|Q|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]|Y|$5|T|U|V|A|$W|Z]]]]

You should add below line in viewDidLoad() 

<pre><code>self.navigationController?.navigationBar.prefersLargeTitles = true
navigationItem.hidesSearchBarWhenScrolling = false
</code></pre>

OR YOU CAN implement <code>viewForHeaderInSection</code> method of <code>UITableViewDataSource</code>

<pre><code>func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -&gt; UIView? 
 {
 let search = UISearchController(searchResultsController: nil)
 search.searchResultsUpdater = self
 return search.searchBar
 }
</code></pre>

<a href="https://i.stack.imgur.com/qruOX.png" rel="nofollow noreferrer">Link to see the screenshot 1</a> <a href="https://i.stack.imgur.com/EOUl9.png" rel="nofollow noreferrer">Link to see the screenshot 2</a>

Xcode 9 beta 6 iOS 11

I have a storyboard for a <code>viewController</code>, the background ImageView, tableView and the searchFooter view are the subViews of the view.The structure is as follows:

<a href="https://i.stack.imgur.com/5NfeH.png" rel="noreferrer"><img src="https://i.stack.imgur.com/5NfeH.png" alt="enter image description here"></a>

In the <code>AppDelegate</code> class,I set 
<code>UINavigationBar.appearance().prefersLargeTitles = true</code> 

and 

<pre><code>UINavigationBar.appearance().setBackgroundImage(UIImage(),for: .default)

UINavigationBar.appearance().shadowImage = UIImage()
</code></pre>

In the <code>viewController</code>class,I set <code>navigationItem.searchController = searchController</code> and <code>navigationItem.hidesSearchBarWhenScrolling = true</code>

<blockquote>
 When I run the application, I found that the <code>shadowImage</code> of the
 <code>navigationBar</code> was still exist. 
 The navigationBar wouldn't become normal(not the prefersLargeTitles
 mode ) automatically(the left gif) when I scrolled the tableView.I hope the navigationBar can work just like the system
 app(the right gif).
</blockquote>

<a href="https://i.stack.imgur.com/iy8of.gif" rel="noreferrer"><img src="https://i.stack.imgur.com/iy8of.gif" alt="my app"></a><a href="https://i.stack.imgur.com/kKXhd.gif" rel="noreferrer"><img src="https://i.stack.imgur.com/kKXhd.gif" alt="system app "></a>

<blockquote>
 A weird behavior: When I remove the background <code>imageView</code>, it can work as well as
 the system app on the simulator.
</blockquote>

I don't know why it happened,I wonder how to solve it? Thanks.

iOS 11 issues with navigationBar prefersLargeTitles

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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Xcode 9 beta 6 iOS 11我有一个viewController的故事板，后台ImageView，tableView和searchFooter view是view.The结构的subViews如下：​​在AppDelegate类中，我设置UINavigationBar.appearance().prefersLargeTitles = true和UINavigationBar.app

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