Swift - 带结果列表的搜索条（UISearchDisplayController）的用法

（注：自iOS8起，苹果便废弃UISearchDisplayController的使用，改为使用UISearchController来实现类似功能，可参考我的另一篇文章“Swift - 使用UISearchController实现带搜索栏的表格”）

UISearchDisplayController控件默认封装了Search Bar和Table View，可同时提供搜索和结果表格显示功能。

下面提供了一个使用样例，同时通过代码定制Search Bar的一些属性来实现自定义的外观和效果，并且展示用于选择搜索范围的分段条的用法。

效果图如下：

    

    

--- ViewController.swift ---

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import UIKit   class ViewController: UIViewController,UISearchBarDelegate {           // 引用通过storyboard创建的控件     @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()         // Do any additional setup after loading the view, typically from a nib.                   // 起始加载全部内容         self.ctrlsel = self.ctrls         // 注册TableViewCell         self.searchDisplay.searchResultsTableView.registerClass(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.dequeueReusableCellWithIdentifier(             identify, forIndexPath: indexPath) as 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) {         println(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 = []             for ctrl in self.ctrls {                 let lc = ctrl.lowercaseString                 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()     }               override func didReceiveMemoryWarning() {         super.didReceiveMemoryWarning()         // Dispose of any resources that can be recreated.     } }

--- Main.storyboard ---

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<?xml version="1.0" encoding="UTF-8" standalone="no"?> <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6254" systemVersion="14B25" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">     <dependencies>         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6247"/>     </dependencies>     <scenes>         <!--View Controller-->         <scene sceneID="tne-QT-ifu">             <objects>                 <viewController id="BYZ-38-t0r" customClass="ViewController" customModule="SwiftInAction_008_013" customModuleProvider="target" sceneMemberID="viewController">                     <layoutGuides>                         <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>                         <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>                     </layoutGuides>                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>                         <subviews>                             <searchBar contentMode="redraw" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="514-A1-KsH">                                 <rect key="frame" x="0.0" y="28" width="320" height="44"/>                                 <textInputTraits key="textInputTraits"/>                                 <connections>                                     <outlet property="delegate" destination="BYZ-38-t0r" id="HNb-H1-SIO"/>                                 </connections>                             </searchBar>                         </subviews>                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>                     </view>                     <connections>                         <outlet property="searchDisplay" destination="Lnz-5r-UWS" id="vbY-sQ-4L2"/>                         <outlet property="searchDisplayController" destination="Lnz-5r-UWS" id="Kly-uU-7J1"/>                     </connections>                 </viewController>                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>                 <searchDisplayController id="Lnz-5r-UWS">                     <connections>                         <outlet property="delegate" destination="BYZ-38-t0r" id="889-9H-eic"/>                         <outlet property="searchBar" destination="514-A1-KsH" id="jg7-8Q-dht"/>                         <outlet property="searchContentsController" destination="BYZ-38-t0r" id="S5V-Yk-ta3"/>                         <outlet property="searchResultsDataSource" destination="BYZ-38-t0r" id="5rb-QW-jlM"/>                         <outlet property="searchResultsDelegate" destination="BYZ-38-t0r" id="9rR-uv-SDW"/>                     </connections>                 </searchDisplayController>             </objects>         </scene>     </scenes> </document>