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Swift - 搜索条（UISearchBar）的用法

1，搜索条Options属性还可设置如下功能样式：

Shows Search Results Button：勾选后，搜索框右边显示一个圆形向下的按钮，单击会发送特殊事件。

Shows Bookmarks Button：勾选后，搜索框右边会显示一个书本的按钮，单击会发送特殊事件。

Shows Cancel Button：勾选后，搜索框右边会出现一个“Cancel”按钮，单击会发送特殊事件。

Shows Scope Bar：勾选后，会在搜索条下面出现一个分段控制器。

2，下面是一个搜索条的使用样例，功能如下：

（1）在Main.storyboard界面里拖入一个Search Bar和一个Table View，Search Bar放到Table View的页眉位置

（2）初始化或者搜索条为空时，表格显示所有数据

（3）搜索条不为空时，表格实时过滤显示匹配的项目

3，效果图

4，代码如下

import UIKit
 
class ViewController: UIViewController,UISearchBarDelegate,
UITableViewDataSource,UITableViewDelegate {
     
    // 引用通过storyboard创建的控件
    @IBOutlet var searchBar : UISearchBar!
    @IBOutlet var tableView : UITableView!
     
    // 所有组件
    var ctrls:[String] = ["Label","Button1","Button2","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.tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "SwiftCell")
    }
     
    // 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 = tableView.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!) {
        // 没有搜索内容时显示全部组件
        if searchText == "" {
            self.ctrlsel = self.ctrls
        }
        else { // 匹配用户输入内容的前缀
            self.ctrlsel = []
            for ctrl in self.ctrls {
                if ctrl.lowercaseString.hasPrefix(searchText) {
                    self.ctrlsel.append(ctrl)
                }
            }
        }
        // 刷新Table View显示
        self.tableView.reloadData()
    }
     
    // 搜索代理UISearchBarDelegate方法，点击虚拟键盘上的Search按钮时触发
    //func searchBarSearchButtonClicked(searchBar: UISearchBar!) {
        //searchBar.resignFirstResponder()
    //}
     
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

--- Main.storyboard ---

<?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_012" 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>
                            <tableView clipsSubviews="YES" contentMode="scaleToFill" fixedFrame="YES" alwaysBounceVertical="YES" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="44" sectionHeaderHeight="22" sectionFooterHeight="22" translatesAutoresizingMaskIntoConstraints="NO" id="eUR-Ky-A8I">
                                <rect key="frame" x="6" y="32" width="320" height="440"/>
                                <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
                                <searchBar key="tableHeaderView" contentMode="redraw" id="8pv-hH-OQ9">
                                    <rect key="frame" x="80" y="218" width="320" height="44"/>
                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                    <textInputTraits key="textInputTraits"/>
                                    <connections>
                                        <outlet property="delegate" destination="BYZ-38-t0r" id="0l9-UU-iHJ"/>
                                    </connections>
                                </searchBar>
                                <connections>
                                    <outlet property="dataSource" destination="BYZ-38-t0r" id="o1t-B2-xHp"/>
                                    <outlet property="delegate" destination="BYZ-38-t0r" id="p1t-kn-J9Q"/>
                                </connections>
                            </tableView>
                        </subviews>
                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
                    </view>
                    <connections>
                        <outlet property="searchBar" destination="8pv-hH-OQ9" id="B0M-ya-PE5"/>
                        <outlet property="tableView" destination="eUR-Ky-A8I" id="YCI-P6-0gY"/>
                    </connections>
                </viewController>
                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
            </objects>
        </scene>
    </scenes>
</document>