当 UISearchController 处于活动状态时，iOS 9 searchBar 从表头视图中消失

iOS 9 searchBar disappears from table header view when UISearchController is active

提问by David Trang

The structure:

结构：

View1 (click a button) -> present modally (MyModalView: UITableViewController)

View1（单击按钮）-> 模态呈现（MyModalView：UITableViewController）

MyModalView has UISearchController embedded. The searchBar of UISearchController is placed in MyModalView.tableView.tableHeaderView.

MyModalView 嵌入了 UISearchController。UISearchController 的 searchBar 放在 MyModalView.tableView.tableHeaderView 中。

It's been working fine since iOS 8.0. However on iOS 9, the searchBar disappear when the UISearchController is active. Please take a look at theses pictures below

自 iOS 8.0 以来一直运行良好。但是在 iOS 9 上，当 UISearchController 处于活动状态时，searchBar 会消失。请看下面的这些图片

The modal view:

模态视图：

UISearchController active on iOS 8:

UISearchController 在 iOS 8 上激活：

UISearchController active on iOS 9:

UISearchController 在 iOS 9 上激活：

The very standard code:

非常标准的代码：

override func viewDidLoad() {
    super.viewDidLoad()

    // Dynamically create a search controller using anonymous function
    self.resultSearchController = ({
        let controller = UISearchController(searchResultsController: nil)
        controller.searchResultsUpdater = self
        controller.dimsBackgroundDuringPresentation = false

        controller.searchBar.sizeToFit()
        controller.searchBar.delegate = self

        self.tableView.tableHeaderView = controller.searchBar

        return controller
    })()

    // Auto sizing row & cell height
    self.tableView.estimatedRowHeight = 130
    self.tableView.rowHeight = UITableViewAutomaticDimension
    self.definesPresentationContext = true

    // No footer for better presentation
    self.tableView.tableFooterView = UIView.init(frame: CGRectZero)
}

This issue also happens in iOS 9.1 beta...

这个问题也发生在 iOS 9.1 测试版中...

Any idea / pointer would be deeply appreciated

任何想法/指针将不胜感激

Cheers.

干杯。

回答by Shwethascar

I'm not sure what exactly is the problem but I 'fixed' it by:

我不确定到底是什么问题，但我通过以下方式“修复”了它：

self.searchController.hidesNavigationBarDuringPresentation = NO;
self.definesPresentationContext = NO;

My guess is that UISearchControlleris doing something funky when it is trying to present as a navigation bar. So, this is a hack but it at least doesn't block the user. The search bar doesn't do the cool animation and cover up the navigation bar.

我的猜测是，UISearchController当它试图作为导航栏呈现时，它正在做一些时髦的事情。所以，这是一个黑客，但它至少不会阻止用户。搜索栏没有做很酷的动画并掩盖了导航栏。

回答by David Trang

It seems all of us got the same problem but they were solved in different ways. However none of the suggested answers worked for me :(. Nevertheless thank you all for your time.

似乎我们所有人都遇到了同样的问题，但他们以不同的方式解决了。然而，没有一个建议的答案对我有用:(。不过谢谢大家的时间。

I got a solution that solved my problem. It is setting Extend Edges - Under Opaque Bars of my (MyModalView: UITableViewController) to true in the Storyboard using Interface Builder.

我得到了解决我的问题的解决方案。它使用界面生成器在情节提要中将 Extend Edges - Under Opaque Bars of my (MyModalView: UITableViewController) 设置为 true。

In summary:

总之：

MyModalView: UITableViewController, in Storyboard using Interface Builder has

MyModalView: UITableViewController, 在 Storyboard 中使用 Interface Builder 有

Extend Edges: - Under Top Bars ticked - Under Bottom Bars ticked - Under Opaque Bars ticked

延伸边缘： - 在顶部条下打勾 - 在底部条下打勾 - 在不透明条下打勾

回答by wiles duan

I found it's the simulated metrics (top bar) in storyboard that's cause this problem. In my case, the following lines work, but I still don't know why.

我发现是故事板中的模拟指标（顶部栏）导致了这个问题。就我而言，以下几行有效，但我仍然不知道为什么。

- (void)willPresentSearchController:(UISearchController *)searchController {
    // do something before the search controller is presented
    self.navigationController.navigationBar.translucent = YES;
}

-(void)willDismissSearchController:(UISearchController *)searchController
{
    self.navigationController.navigationBar.translucent = NO;
}

回答by jigzat

I had to

我不得不

self.aNavigationController?.extendedLayoutIncludesOpaqueBars = true

I found a similar question herebut in my case it was not on the viewDidLoad method. I had to try different views until it worked. Now I can have both a custom navigation bar color and the search bar,

我在这里发现了一个类似的问题，但就我而言，它不在 viewDidLoad 方法上。我不得不尝试不同的观点，直到它奏效。现在我可以同时拥有自定义导航栏颜色和搜索栏，

回答by patrick kuang

Thanks @wiles duan and @Techprimate

感谢@wiles duan 和@Techprimate

In my case, I fixed this issue by setting:

就我而言，我通过设置解决了这个问题：

self.definesPresentationContext = NO;

And implement the following 2 methods in UISearchControllerDelegate

并在 UISearchControllerDelegate 中实现以下 2 个方法

- (void)willPresentSearchController:(UISearchController *)searchController {
    // do something before the search controller is presented
    self.navigationController.navigationBar.translucent = YES;
}

-(void)willDismissSearchController:(UISearchController *)searchController
{
    self.navigationController.navigationBar.translucent = NO;
}

回答by Phil Niedertscheider

I fixed it in my case by removing

我通过删除在我的情况下修复了它

definesPresentationContext = true

definesPresentationContext = true

I didn't test yet if there are any disadvantages of removing this!

我还没有测试删除它是否有任何缺点！

回答by Yassine ElBadaoui

I had the same problem, and when I debugged the UI on Xcode I found that the UISearchBarview was moved to another view and the width was zeroed.

我遇到了同样的问题，当我在 Xcode 上调试 UI 时，我发现UISearchBar视图被移动到另一个视图并且宽度为零。

I fixed it by setting definesPresentationContextproperty of the UISearchControllerto false, and setting it truefor the containing UITableViewController.

我通过设置to 的definesPresentationContext属性来修复它，并将其设置为包含.UISearchControllerfalsetrueUITableViewController

I added only one line to your viewDidLoad().

我只在你的viewDidLoad().

override func viewDidLoad() {
    super.viewDidLoad()

    // Dynamically create a search controller using anonymous function
    self.resultSearchController = ({
        let controller = UISearchController(searchResultsController: nil)
        controller.searchResultsUpdater = self
        controller.dimsBackgroundDuringPresentation = false
        controller.definesPresentationContext = false    // Disable the presentation controller

        controller.searchBar.sizeToFit()
        controller.searchBar.delegate = self

        self.tableView.tableHeaderView = controller.searchBar

        return controller
    })()

    // Auto sizing row & cell height
    self.tableView.estimatedRowHeight = 130
    self.tableView.rowHeight = UITableViewAutomaticDimension
    self.definesPresentationContext = true    // This one remains the same

    // No footer for better presentation
    self.tableView.tableFooterView = UIView.init(frame: CGRectZero)
}

回答by igraczech

I don't have a navigation bar in this place of an app. None of other SO posts helped me, so I've fixed it this way:

我在应用程序的这个地方没有导航栏。其他 SO 帖子都没有帮助我，所以我以这种方式修复了它：

- (void)layoutSubviews
{
    [[[self searchController] searchBar] sizeToFit];
}

回答by Victor Gomes

It works

有用

override func viewDidLoad() {
    super.viewDidLoad()

    self.extendedLayoutIncludesOpaqueBars = !self.navigationController!.navigationBar.translucent
}

回答by Per

Setting the navigationBar permanently to translucent in storyboard solved my problem.

在故事板中将导航栏永久设置为半透明解决了我的问题。