iOS8 UISearchViewController搜索功能讲解

     在iOS8以前我们实现搜索功能需要用到UISearchbar和UISearchDisplayController, 在iOS8之后呢, UISearchController配合UITableView的使用相比之下简单很多,  需要签订两个代理协议UISearchControllerDelegate, UISearchResultsUpdating.还有一个很重要的属性self.searchVC.active,,返回的BOOL如果为yes,UITableView的数据源应该为搜索后的数组即resultArray, 否则为原始数组即self.dataArray-------需要在UITableView的代理方法里做判断.  运行效果图如下:

具体代码如下:

.h文件

//  ViewController.h

//  SearchForChinese

//  Created by Dong on 15/5/14.

//  Copyright (c) 2015年 xindong. All rights reserved.

#import <UIKit/UIKit.h>

#import "ChinesePinyin/ChineseSorting.h"

@interface ViewController : UIViewController<UITableViewDelegate, UITableViewDataSource, UISearchControllerDelegate, UISearchResultsUpdating>

@property (nonatomic, strong) UITableView *tableView;

@property (nonatomic, strong) UISearchController *searchVC;

// 存放排好序的数据(汉字)

@property (nonatomic, strong) NSMutableDictionary *sectionDictionary;

// 存放汉字拼音大写首字母

@property (nonatomic, strong) NSArray *keyArray;

// 存放汉字(地名)

@property (nonatomic, strong) NSMutableArray *dataArray;

@end

//  ViewController.m

//  SearchForChinese

//  Created by Dong on 15/5/14.

//  Copyright (c) 2015年 xindong. All rights reserved.

#import "ViewController.h"

#define WIDTH [UIScreen mainScreen].bounds.size.width

#define HEIGHT [UIScreen mainScreen].bounds.size.height

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, WIDTH, 64)];

    label.backgroundColor = [UIColor greenColor];

    label.text = @"\n搜搜";

    label.numberOfLines = 0;

    label.textAlignment = NSTextAlignmentCenter;

    [self.view addSubview:label];

    self.tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 64, WIDTH, HEIGHT) style:UITableViewStyleGrouped];

    self.tableView.backgroundColor = [UIColor clearColor];

    self.tableView.delegate = self;

    self.tableView.dataSource = self;

    [self.view addSubview:self.tableView];

    // UISearchController初始化

    self.searchVC = [[UISearchController alloc] initWithSearchResultsController:nil];

    self.searchVC.searchResultsUpdater = self;

    self.searchVC.delegate = self;

    self.searchVC.searchBar.frame = CGRectMake(0, 100, WIDTH, 44);

    self.searchVC.searchBar.barTintColor = [UIColor yellowColor];

    self.tableView.tableHeaderView = self.searchVC.searchBar;

    // 设置为NO,可以点击搜索出来的内容

    self.searchVC.dimsBackgroundDuringPresentation = NO;

    // 原始数据

    self.dataArray = [NSMutableArray arrayWithObjects:@"大兴", @"丰台", @"海淀", @"朝阳", @"东城", @"崇文", @"西城", @"石景山",@"通州", @"密云", @"迪拜", @"华仔", @"三胖子", @"大连",  nil];

    [self customSortingOfChinese:self.dataArray];

}

/*

 **

 **********************调用排序方法 (本人自己封装的方法, 下载地址:https://github.com/Tbwas/ChineseCharacterSorting)

*

**/

- (void)customSortingOfChinese:(NSMutableArray *)array

{

    // 获取汉字拼音首字母

    self.keyArray = [[ChineseSorting sharedInstance] firstCharcterSortingOfChinese:array];

    // 将汉字排序

    self.sectionDictionary = [NSMutableDictionary dictionary];

    self.sectionDictionary = [[ChineseSorting sharedInstance] chineseCharacterSorting:array KeyArray:self.keyArray];

}

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

{

    return self.keyArray.count;

}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

{

    // 取每个section对应的数组

    NSArray *arr = [self.sectionDictionary objectForKey:self.keyArray[section]];

    return arr.count;

}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

    static NSString *str = @"cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:str];

    if (!cell) {

        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:str];

    }

    NSArray *arr = [self.sectionDictionary objectForKey:self.keyArray[indexPath.section]];

    cell.textLabel.text = arr[indexPath.row];

    return cell;

}

// section的标题

-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section

{

    return self.keyArray[section];

}

// 搜索界面将要出现

- (void)willPresentSearchController:(UISearchController *)searchController

{

    NSLog(@"将要  开始  搜索时触发的方法");

}

// 搜索界面将要消失

-(void)willDismissSearchController:(UISearchController *)searchController

{

    NSLog(@"将要  取消  搜索时触发的方法");

}

-(void)didDismissSearchController:(UISearchController *)searchController

{

    [self customSortingOfChinese:self.dataArray];

    [self.tableView reloadData];

}

#pragma mark -- 搜索方法

// 搜索时触发的方法

-(void)updateSearchResultsForSearchController:(UISearchController *)searchController

{

    NSString *searchStr = [self.searchVC.searchBar text];

    // 谓词

    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS %@", searchStr];

    // 过滤数据

    NSMutableArray *resultDataArray = [NSMutableArray arrayWithArray:[self.dataArray filteredArrayUsingPredicate:predicate]];

    // 调用地名排序的方法

    [self customSortingOfChinese:resultDataArray];

    // 刷新列表

    [self.tableView reloadData];

}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

{

    UIAlertView *arlertView = [[UIAlertView alloc] initWithTitle:@"提示" message:@"表点啦" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"听话", nil];

    [arlertView show];

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end