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.

如果不使用此搜索栏，则用户界面将进行折腾。请告诉我这里我做错了什么。

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
            }

问题清单

• 在iOS 11上，如果将UISearchbar添加到标题视图
，则UI会出现附加图像错误
• 如果我尝试添加导航项目，如代码中所述，它不会出现
• 由于我在搜索处于活动状态时使用不同的搜索结果控制器，我需要在当前控制器中禁用操作 - 如何轻松实现此目的。

Answer 1

我不确定那里出了什么问题，但在我的情况下，它运作正常。这是我的代码：

1. 创建了一个searchController

   fileprivate 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 }

很高兴。