iOS开发之高级视图—— UISearchController

     UISearchController控件正好了UISearchBar、UITableView，而且内部提供了良好的封装，可以方便的实现搜索列表。

     创建一个工程，并且删除原来的ViewController.h和ViewController.m,重新建立一个文件，命名为ViewController，继承UITableViewController。

     AppDelegate.m

//
//  AppDelegate.m
//  UISearchControllerDemo
//
//  Created by Apple on 16/5/26.
//  Copyright © 2016年 Apple. All rights reserved.
//

#import "AppDelegate.h"
#import "ViewController.h"

@interface AppDelegate ()

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    
    self.window.backgroundColor = [UIColor whiteColor];
    
    ViewController* viewController = [[ViewController alloc] initWithStyle:UITableViewStyleGrouped];
    
    self.window.rootViewController = viewController;
    
    [self.window makeKeyAndVisible];
    return YES;
    return YES;
}


@end

   ViewController.h

//
//  ViewController.h
//  UISearchControllerDemo_c
//
//  Created by apple on 15/7/10.
//  Copyright (c) 2015年 fkit.org. All rights reserved.
//

#import 

@interface ViewController : UITableViewController 

@end

 ViewController.m

//
//  ViewController.m
//  UISearchControllerDemo
//
//  Created by Apple on 16/5/26.
//  Copyright © 2016年 Apple. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

// ? 必须定义成全局变量
UISearchController *searchController;
// 保存原始表格数据的NSArray对象。
NSArray * tableData;
// 保存搜索结果数据的NSArray对象。
NSArray* searchData;

- (void)viewDidLoad {
    NSLog(@"viewDidLoad --> 装载控件");
    [super viewDidLoad];
    
    // 初始化原始表格数据
    tableData = [NSArray arrayWithObjects:@"Java讲义",
                 @"轻量级Java EE企业应用实战",
                 @"Android讲义",
                 @"Ajax讲义",
                 @"HTML5/CSS3/JavaScript讲义",
                 @"iOS讲义",
                 @"XML讲义",
                 @"经典Java EE企业应用实战"
                 @"Java入门与精通",
                 @"Java基础教程",
                 @"学习Java",
                 @"Objective-C基础" ,
                 @"Ruby入门与精通",
                 @"iOS开发教程" , nil];
    
    // 注册
    [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"reuseIdentifier"];
    
    // UISearchController控件整合了UISearchBar，而且内部提供了良好的封装，可以方便的实现搜索列表。
    searchController = [[UISearchController alloc] initWithSearchResultsController:nil];
    // 注意：必须设置searchBar的大小
    searchController.searchBar.frame = CGRectMake(0, 88, 100, 66);
    // 设置提示
    //    searchController.searchBar.prompt = @"查找图书";
    searchController.searchBar.placeholder = @"请输入字符";
    // 显示CancelButton
    searchController.searchBar.showsCancelButton = true;
    
    // 设置这个对象（self）负责更新搜索结果控制器的内容
    searchController.searchResultsUpdater = self;
    // 搜索结果的背景
    //    searchController.dimsBackgroundDuringPresentation = NO;
    
    searchController.searchBar.delegate = self;
    
    self.tableView.tableHeaderView = searchController.searchBar;
    
    
}

-(void) viewDidAppear:(BOOL)animated{
    //    self.tableView.frame = [UIScreen mainScreen].applicationFrame;
}

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController{
    NSLog(@"updateSearchResultsForSearchController --> ");
    // 定义搜索谓词
    NSPredicate* pred = [NSPredicate predicateWithFormat:
                         @"SELF CONTAINS[c] %@" , searchController.searchBar.text];
    // 使用谓词过滤tableData数组，返回新数组searchData
    searchData = [tableData filteredArrayUsingPredicate:pred];
    NSLog(@"searchData -->%lu",[searchData count]);
    // 刷新数据（显示新数组）
    [self.tableView reloadData];
}

- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar{
    NSLog(@"searchBarCancelButtonClicked --> ");
}


#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    // Return the number of sections.
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    // Return the number of rows in the section.
    if (searchController.active) {
        return [searchData count];
    }else{
        return [tableData count];
    }
    
}

/**/
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"reuseIdentifier" forIndexPath:indexPath];
    
    if (searchController.active) {
        cell.textLabel.text = [searchData objectAtIndex:indexPath.row];
    }else{
        cell.textLabel.text = [tableData objectAtIndex:indexPath.row];
    }
    
    return cell;
}


/*
 // Override to support conditional editing of the table view.
 - (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
 // Return NO if you do not want the specified item to be editable.
 return YES;
 }
 */

/*
 // Override to support editing the table view.
 - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
 if (editingStyle == UITableViewCellEditingStyleDelete) {
 // Delete the row from the data source
 [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
 } else if (editingStyle == UITableViewCellEditingStyleInsert) {
 // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
 }
 }
 */

/*
 // Override to support rearranging the table view.
 - (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
 }
 */

/*
 // Override to support conditional rearranging of the table view.
 - (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
 // Return NO if you do not want the item to be re-orderable.
 return YES;
 }
 */

/*
 #pragma mark - Navigation
 
 // In a storyboard-based application, you will often want to do a little preparation before navigation
 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
 // Get the new view controller using [segue destinationViewController].
 // Pass the selected object to the new view controller.
 }
 */

@end

     效果图如下：