UISearchController(使用、修改cancel文字)

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[_searchController.searchBar setValue:@"取消" forKey:@"_cancelButtonText"];

iOS8之前我们使用UISearchDisplayController做TableView的本地搜索，查看UIKit库，苹果已经使用新控件取代它。

NS_CLASS_DEPRECATED_IOS(3_0, 8_0, "UISearchDisplayController has been replaced with UISearchController") __TVOS_PROHIBITED

使用UISearchDisplayController的时候，搜索结果的展示tableView系统已经帮我们封装好，但是使用UISearchController，我们需要提供一个搜索结果的展示TableView.

如何使用UISearchController实现搜索功能呢？

1创建一个搜索结果展示TableViewController

.h文件

#import <UIKit/UIKit.h>@interface SearchResultVC : UITableViewController// 搜索结果数据@property (nonatomic, strong) NSMutableArray *resultsArray;@end

#import "SearchResultVC.h"@interface SearchResultVC ()@end@implementation SearchResultVC- (void)viewDidLoad {    [super viewDidLoad];}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}#pragma mark - Table view data source- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {   return self.resultsArray.count;}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {    UITableViewCell *cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"RESULT_CELL"];    if (cell == nil) {        cell = [tableView dequeueReusableCellWithIdentifier:@"RESULT_CELL"];    }    cell.textLabel.text = self.resultsArray[indexPath.row];    cell.accessoryType=UITableViewCellAccessoryDisclosureIndicator;    return cell;}

2 创建一个UISearchController

- (void)initSearchController{    SearchResultVC *resultTVC = [[SearchResultVC alloc] initWithStyle:UITableViewStylePlain];    UINavigationController *resultVC = [[UINavigationController alloc] initWithRootViewController:resultTVC];    self.searchController = [[UISearchController alloc]initWithSearchResultsController:resultVC];    self.searchController.searchResultsUpdater = self;    //self.searchController.dimsBackgroundDuringPresentation = NO;    //self.searchController.hidesNavigationBarDuringPresentation = NO;    self.searchController.searchBar.frame = CGRectMake(self.searchController.searchBar.frame.origin.x,self.searchController.searchBar.frame.origin.y,self.searchController.searchBar.frame.size.width,44);    self.tableView.tableHeaderView = self.searchController.searchBar;        self.searchController.searchBar.delegate = self;}

3 实现UISearchController的UISearchResultsUpdating方法，当开始搜索的时候响应。并且实现筛选的逻辑

#pragma mark - UISearchResultsUpdating- (void)updateSearchResultsForSearchController:(UISearchController *)searchController{    UINavigationController *navController = (UINavigationController *)self.searchController.searchResultsController;    SearchResultVC *resultVC = (SearchResultVC *)navController.topViewController;    [self filterContentForSearchText:self.searchController.searchBar.text];    resultVC.resultsArray = self.tempsArray;    [resultVC.tableView reloadData];}#pragma mark - Private Method- (void)filterContentForSearchText:(NSString *)searchText{    NSLog(@"%@",searchText);    NSUInteger searchOptions = NSCaseInsensitiveSearch | NSDiacriticInsensitiveSearch;    [self.tempsArray removeAllObjects];    for (int i = 0; i < self.resultArray.count; i++) {        NSString *title = self.resultArray[i];        NSRange storeRange = NSMakeRange(0, title.length);        NSRange foundRange = [title rangeOfString:searchText options:searchOptions range:storeRange];        if (foundRange.length) {            [self.tempsArray addObject:self.resultArray[i]];        }    }}

完成了，就是这么简单，UI什么的可以自定义。简单demo可以去我github上下载： https://github.com/wangdachui/WTUISearchController

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