iOS原生的搜索：UISearchController

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

.m

#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