ios – 将UISearchController与UINavigationController一起使用

概述我遇到的问题与 here相同,没有任何答案. (将searchController.active设置为false会清除搜索文本,这是我不想要的.)我想使用UISearchController,以便用户可以搜索我的UITableView中的项目列表.我在Interface Builder中连接了一个show segue,它在选择表视图的单元格时触发.  问题是,如果用户搜索某些内容然后单击该表格的单 我遇到的问题与 here相同,没有任何答案. (将searchController.active设置为false会清除搜索文本,这是我不想要的.)我想使用UISearchController,以便用户可以搜索我的UItableVIEw中的项目列表.我在Interface Builder中连接了一个show segue,它在选择表视图的单元格时触发.
 问题是,如果用户搜索某些内容然后单击该表格的单元格,当它转移到新视图时,搜索栏就会位于该位置.理想情况下,我希望在用户搜索时导航栏被搜索栏“替换”,然后在用户点击单元格时返回导航栏,然后在用户单击时返回搜索栏“返回键. (这是现在已弃用的UISearchdisplayController的工作方式.)如何实现这一目标？这是我的表视图的控制器.

class ItemSearchVIEwController: UItableVIEwController,UISearchResultsUpdating{    var searchController: UISearchController?    let itemList = [ItemList(category:"Chocolate",name:"chocolate bar",price: 1234),ItemList(category:"Chocolate",name:"chocolate Chip",name:"dark chocolate",ItemList(category:"Hard",name:"lollipop",name:"candy cane",name:"jaw breaker",ItemList(category:"Other",name:"caramel",name:"sour chew",name:"gummi bear",price: 1234)]    var filteredList : [ItemList] = []    overrIDe func vIEwDIDLoad()    {        super.vIEwDIDLoad()        self.Title = "Item Search"        self.tableVIEw.delegate = self        self.tableVIEw.dataSource = self        self.searchController = UISearchController(searchResultsController: nil)        self.searchController!.searchResultsUpdater = self        self.searchController!.hIDesNavigationbarDuringPresentation = true        self.searchController!.dimsBackgroundDuringPresentation = false        self.searchController!.searchbar.searchbarStyle = .Minimal        self.searchController!.searchbar.sizetoFit()        self.tableVIEw.tableheaderVIEw = self.searchController!.searchbar      }    overrIDe func prepareForSegue(segue: UIStoryboardSegue,sender: AnyObject?)    {        if (segue.IDentifIEr == "itemDetail")        {            let itemDetailVIEwController = segue.destinationVIEwController as UIVIEwController            let selectedCell = sender as UItableVIEwCell            itemDetailVIEwController.Title = selectedCell.textLabel?.text        }    }    overrIDe func tableVIEw(tableVIEw: UItableVIEw,cellForRowAtIndexPath indexPath: NSIndexPath) -> UItableVIEwCell    {        let cell = self.tableVIEw.dequeueReusableCellWithIDentifIEr("Cell") as UItableVIEwCell        var item : ItemList        if self.searchController!.active        {            item = self.filteredList[indexPath.row]        }        else        {            item = self.itemList[indexPath.row]        }        cell.textLabel!.text = item.name        return cell}    overrIDe func tableVIEw(tableVIEw: UItableVIEw,numberOfRowsInSection section: Int) -> Int    {        if (self.searchController!.active)        {            return self.filteredList.count        }        else        {            return self.itemList.count        }    }}extension ItemSearchVIEwController: UISearchResultsUpdating{    func updateSearchResultsForSearchController(searchController: UISearchController)    {        if (searchController.searchbar.text.isEmpty)        {            self.filteredList = self.itemList        }        else        {            let searchPredicate =            {                (item: ItemList) -> Bool in                item.name.rangeOfString(searchController.searchbar.text,options: .CaseInsensitiveSearch) != nil            }            self.filteredList = self.itemList.filter(searchPredicate)        }        self.tableVIEw.reloadData()    }}

解决方法 在vIEwDIDLoad()中添加此行

definesPresentationContext = true

来自definesPresentationContext的文档

A Boolean value that indicates whether this vIEw controller’s vIEw is covered when the vIEw controller or one of its descendants presents a vIEw controller.

讨论

When a vIEw controller is presented,iOS starts with the presenting vIEw controller and asks it if it wants to provIDe the presentation
context. If the presenting vIEw controller does not provIDe a context,
then iOS asks the presenting vIEw controller’s parent vIEw
controller. iOS searches up through the vIEw controller hIErarchy
until a vIEw controller provIDes a presentation context. If no vIEw
controller offers to provIDe a context,the window’s root vIEw
controller provIDes the presentation context.

If a vIEw controller returns true,then it provIDes a presentation context. The portion of the window covered by the vIEw controller’s vIEw determines the size of the presented vIEw controller’s vIEw. The default value for this property is false.

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