ios - Q: Search Bar and Search Display Controller in storyboard with swift and Xcode8.0 crash at Appdelegate -

storyboard layout below:

this demo, , don't know error comes out.

in viewcontroller:

import uikit import foundation  class viewcontroller: uiviewcontroller {  @iboutlet weak var tableview: uitableview!   @iboutlet var searchdisplay: uisearchdisplaycontroller!  // 所有组件 var ctrls:[string] = ["label","button1-初级","button1-高级","button2-初级","button2-高级","switch"]  // 搜索匹配的结果，table view使用这个数组作为datasource var ctrlsel:[string] = []  override func viewdidload() {     super.viewdidload()      // 起始加载全部内容     self.ctrlsel = self.ctrls     // 注册tableviewcell     self.searchdisplay.searchresultstableview.register(uitableviewcell.self,                                                             forcellreuseidentifier: "swiftcell")     // 设置文本提示     self.searchdisplay.searchbar.placeholder = "输入搜索信息"     // 可以设置初始值     //self.searchdisplay.searchbar.text = "b"     // 设置搜索栏提示信息     self.searchdisplay.searchbar.prompt = "搜索组件名称"     // 不显示search bar边框     self.searchdisplay.searchbar.searchbarstyle = uisearchbarstyle.minimal     // 显示分段条     self.searchdisplay.searchbar.showsscopebar = true     self.searchdisplay.searchbar.scopebuttontitles = ["全部","初级","高级"] }  // 返回表格行数（也就是返回控件数） func tableview(tableview: uitableview!, numberofrowsinsection section: int) -> int {     return self.ctrlsel.count }    // 创建各单元显示内容(创建参数indexpath指定的单元） func tableview(tableview: uitableview!, cellforrowatindexpath indexpath: nsindexpath!)     -> uitableviewcell! {     // 为了提供表格显示性能，已创建完成的单元需重复使用     let identify:string = "swiftcell"     // 同一形式的单元格重复使用，在声明时已注册     let cell = self.searchdisplay.searchresultstableview.dequeuereusablecell(         withidentifier: identify, for: indexpath indexpath) uitableviewcell     cell.accessorytype = uitableviewcellaccessorytype.disclosureindicator     cell.textlabel?.text = self.ctrlsel[indexpath.row]     return cell }  // 搜索代理uisearchbardelegate方法，每次改变搜索内容时都会调用 func searchbar(searchbar: uisearchbar!, textdidchange searchtext: string!) {     self.searchtext = searchtext     searchctrls() }  // 选择分段条时调用 func searchbar(searchbar: uisearchbar!, selectedscopebuttonindexdidchange selectedscope: int) {     print(selectedscope)     searchctrls(); } // 保存搜索内容 var searchtext:string = ""  // 搜索过滤 func searchctrls() {     // 没有搜索内容时显示全部组件     if self.searchtext == "" {         self.ctrlsel = self.ctrls     }     else {         var scope = self.searchdisplay.searchbar.selectedscopebuttonindex;         // 匹配用户输入内容的前缀         self.ctrlsel = []         ctrl in self.ctrls {             let lc = ctrl.lowercased()             if lc.hasprefix(self.searchtext) {                 if (scope == 0 || (scope == 1 && lc.hassuffix("初级"))                     || (scope == 2 && lc.hassuffix("高级"))) {                     self.ctrlsel.append(ctrl)                 }             }         }     }      // 不需要刷新table view显示     // self.searchdisplay.searchresultstableview.reloaddata() }  } 

crash @ appdelegate. in swift3 , xcode 8.0 environment. convenient search result ,use search bar , search display controller in storyboard.

when run application, crash @ :class appdelegate: uiresponder, uiapplicationdelegate line inappdelegate.swift.the break info : thread 1: breakpoint 2.1

edit:

after set datasource , delegate of tableview vc: there comes strange scenario：the searchbar under tableview

i believe have set datasource , delegate of tableview incorrectly, please set datasource , delegate either in interface builder shown in below screenshot,

select tableview , set data source in connection inspector.

or can via code, setting them in viewdidload() method. paste these lines in viewdidload()

tableview.datasource = self tableview.delegate = self 

as can see code snippet you've pasted, you've implemented uitableviewdelegate & uitableviewdatasource methods. you've not mentioned class conforms these protocols modify class declaration , specify class conforms these protocols.

class viewcontroller: uiviewcontroller, uitableviewdelegate, uitableviewdatasource { //your class implementation goes here }