iOS原生的搜索：UISearchController

iOS8之前我們使用UISearchDisplayController做TableView的本地搜索，查看UIKit庫，蘋果已經使用新控件取代它。

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

使用UISearchDisplayController的時候，搜索結果的展示tableView系統已經幫我們封裝好，但是使用UISearchController，我們需要提供一個搜索結果的展示TableView.

如何使用UISearchController實現搜索功能呢？

1創建一個搜索結果展示TableViewController

.h文件

#import <UIKit/UIKit.h>

@interface SearchResultVC : UITableViewController
// 搜索結果數據
@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 創建一個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 實現UISearchController的UISearchResultsUpdating方法，當開始搜索的時候響應。并且實現篩選的邏輯

#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，就是這么簡單，UI什么的可以自定義。簡單demo可以去我github上下載： https://github.com/wangdachui/WTUISearchController