Swift 简略控件示例：搜索框（UISearchBar）

//
//  ViewController.swift
//  UISearchBarSample
//
//  Created by jinnchang on 15/4/2.
//  Copyright (c) 2015年 Jinn Chang. All rights reserved.
//

import UIKit

class ViewController: UIViewController, UISearchBarDelegate {
    
    var searchBar: UISearchBar!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        searchBar = UISearchBar(frame: CGRectMake(0, 20, self.view.frame.size.width, 80))
        searchBar.placeholder = "search"
        searchBar.barStyle = .Default
        searchBar.showsBookmarkButton = true
        searchBar.showsCancelButton = true
        searchBar.delegate = self
        
        self.view.addSubview(searchBar)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    // 每次输入内容改变触发事件
    func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {
        println("筛选内容：\(searchText)")
    }
    
    // 书签按钮触发事件
    func searchBarBookmarkButtonClicked(searchBar: UISearchBar) {
        println("搜索历史记录")
    }
    
    // 取消按钮触发事件
    func searchBarCancelButtonClicked(searchBar: UISearchBar) {
        println("取消搜索")
    }
    
    // 搜索触发事件
    func searchBarSearchButtonClicked(searchBar: UISearchBar) {
        println("开始搜索")
    }

}