UISearchController SearchBar 在旋转期间处于活动状态时未对齐 [英] UISearchController SearchBar misaligns while active during rotation

问题描述

我已经为 UISearchController 的搜索栏苦苦挣扎了一段时间.我需要在 tableview 上实现搜索功能，但与传统方法不同，我没有将搜索栏放在 table 标题视图上.相反，我创建了一个 UIView 并将搜索栏添加为它的子视图.充当搜索栏容器的 UIView 在具有自动布局的故事板上正确设置了其约束.

I have been struggling with UISearchController's search bar for quite a while now. I need a search feature to be implemented on a tableview but unlike conventional methods, I didn't put the search bar on a table header view. Instead, I created a UIView and added the search bar as a subview to it. The UIView which acts as a container to search bar has its constraints properly set on the storyboard with auto layout.

这是我的代码.请注意，我以编程方式执行此操作是因为 UISearchDisplayController 和 UISearchBar 自 iOS 8 起已被弃用，而支持 UISearchController，并且尚未加入 UIKit.

Here are my codes for it. Note that I did this programmatically because UISearchDisplayController and UISearchBar has been deprecated as of iOS 8 in favour of UISearchController and has yet to come to UIKit.

searchController = UISearchController(searchResultsController: nil)
searchController.searchResultsUpdater = self
searchController.dimsBackgroundDuringPresentation = false
searchController.searchBar.autoresizingMask = .FlexibleRightMargin
searchController.searchBar.delegate = self
definesPresentationContext = true
self.searchContainerView.addSubview(searchController.searchBar)

但是，我确实注意到搜索栏在旋转过程中的一种奇怪行为.当它在纵向上处于活动状态时，我将模拟器旋转到横向，然后按取消，搜索栏将返回纵向宽度.

However, I did notice one odd behaviour of the search bar during rotation. When it is active on Portrait, I rotate the simulator to Landscape, and press Cancel, the search bar goes back to Portrait Width.

反之亦然.

我将不胜感激，因为我至少已经在这个问题上工作了好几天了.非常感谢

I would appreciate any ideas or maybe some hints towards the correct direction to solve this as I have been at this for days at least. Thank you very much

推荐答案

经过这么多天的挣扎:

风景的肖像

1. 使 SearchBar/SearchController 在纵向中处于活动状态
2. 旋转到横向
3. 按取消，SearchBar 将返回纵向宽度

从风景到肖像

1. 使 SearchBar/SearchController 在横向中处于活动状态
2. 旋转到纵向
3. 按取消，SearchBar 将返回横向宽度

我终于自己解决了.似乎当用户在 SearchBar 上按下取消时，ViewController 将调用 viewDidLayoutSubviews 因此我试图通过在 viewDidLayoutSubviews 中调用此函数来重置宽度:

I finally solved it on my own. It seems that when a user presses Cancel on the SearchBar, the ViewController will call viewDidLayoutSubviews thus I tried to reset the width by calling this function in viewDidLayoutSubviews:

func setupSearchBarSize(){
     self.searchController.searchBar.frame.size.width = self.view.frame.size.width
}

但这并没有我想象的那么好.所以这就是我认为会发生的事情.当用户激活 SearchController/SearchBar 时，SearchController 会在调整自身大小之前保存当前帧.然后，当用户按下取消或关闭它时，它将使用保存的框架并将其调整为该框架大小.

But that didn't work as well as I thought. So here is what I think happens. When a user activates the SearchController/SearchBar, the SearchController saves the current frame before it resizes itself. Then when a user presses Cancel or dismisses it, it will use the saved frame and resize to that frame size.

因此，为了在我按下取消键时强制重新对齐其宽度，我必须在我的 VC 中实现 UISearchControllerDelegate 并检测何时取消 SearchController，然后再次调用 setupSearchBarSize().

So in order to force its width to be realigned when I press Cancel, I have to implement the UISearchControllerDelegate in my VC and detect when the SearchController is dismissed, and call setupSearchBarSize() again.

以下是解决这个问题的相关代码:

Here are the relevant codes to solve this question:

class HomeMainViewController : UIViewController, UISearchControllerDelegate, UISearchResultsUpdating, UITableViewDelegate, UITableViewDataSource, UISearchBarDelegate {
    @IBOutlet weak var searchContainerView: UIView!

override func viewDidLoad() {
    super.viewDidLoad()

        searchController = UISearchController(searchResultsController: nil)
        searchController.searchResultsUpdater = self
        searchController.dimsBackgroundDuringPresentation = false
        searchController.searchBar.autoresizingMask = .FlexibleRightMargin
        searchController.searchBar.delegate = self
        searchController.delegate = self
        definesPresentationContext = true
        self.searchContainerView.addSubview(searchController.searchBar)
        setupSearchBarSize()
}

func setupSearchBarSize(){
        self.searchController.searchBar.frame.size.width = self.view.frame.size.width
}

func didDismissSearchController(searchController: UISearchController) {
        setupSearchBarSize()
}

override func viewDidLayoutSubviews() {
        setupSearchBarSize()
 }
}

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