swift - iOS 11 中的 UISearchBar 对齐问题

Question

   I have UITableViewController where i was adding UISearchController searchbar as an headerView and I have changed this to navigationItem.searchcontroller for iOS 11 in iOS 11 searchbar won't appear at all even navigationItem was present.

如果不使用这个搜索栏用户界面就会被折腾。请告诉我我在这里做错了什么。

let  searchController = UISearchController(searchResultsController: vc)
            searchController.searchBar.scopeButtonTitles = ["All", "images", "videos", "others"]
            searchController.dimsBackgroundDuringPresentation = false
            // Don't remove these two lines then search bar alignment issue will raise
            self.extendedLayoutIncludesOpaqueBars = true
            self.searchController.searchBar.isHidden = false
            definesPresentationContext = false
            if #available(iOS 11.0, *) {
                 self.navigationItem.searchController = searchController // not working for me.
                searchController?.hidesNavigationBarDuringPresentation = false
                 navigationItem.hidesSearchBarWhenScrolling = false

            } else {
                searchController?.hidesNavigationBarDuringPresentation = true
                searchController?.searchBar.sizeToFit()
                tableView.tableHeaderView = searchController.searchBar
            }

问题列表是

• 在 iOS 11 上，如果将 UISearchbar 添加到标题 View ，UI 会作为附加图像出错
• 如果我尝试添加到代码中提到的导航项，它不会出现
• 由于我在搜索处于事件状态时使用不同的搜索结果 Controller ，因此我需要禁用当前 Controller 中的操作 - 如何轻松实现此目的。

Answer 1

我不太确定那里出了什么问题，但就我而言，它工作正常。这是我的代码:

1. 创建了一个 searchController 文件:

   private let searchController = UISearchController(searchResultsController: nil)
   

2. 在viewDidLoad()中:

   searchController.searchResultsUpdater = self
   searchController.obscuresBackgroundDuringPresentation = false
   searchController.searchBar.placeholder = kSearchPlaceholder
   searchController.searchBar.scopeButtonTitles = [kCategory, kAuthor, kPicture]
   searchController.searchBar.delegate = self
   definesPresentationContext = true
   
   if #available(iOS 11.0, *) {
     navigationItem.searchController = searchController
   } else {
     tableView.tableHeaderView = searchController.searchBar
   }
   

一切顺利。