搜索功能

@interface HZAutoPartsViewController ()<UITableViewDelegate,UITableViewDataSource,UISearchResultsUpdating, UISearchBarDelegate>
// 搜索控制器
@property (nonatomic, strong) UISearchController *searchController;
// 搜索结果
@property (nonatomic, strong) NSMutableArray *searchResults;
@end

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = HZWhiteColor;
    /**
     *  搜索相关
     */
    self.searchResults = [NSMutableArray array];
    HZTSearchResultController *searchResultVC = [[HZTSearchResultController alloc]init];
    searchResultVC.title = self.title;
    
    UINavigationController *searchResultNAV = [[UINavigationController alloc]initWithRootViewController:searchResultVC];
    self.searchController = [[UISearchController alloc]initWithSearchResultsController:searchResultNAV];
    // 设置代理
    self.searchController.searchResultsUpdater = self;
    // 搜索框frame
    self.searchController.searchBar.frame = CGRectMake(self.searchController.searchBar.frame.origin.x, self.searchController.searchBar.frame.origin.y, self.searchController.searchBar.frame.size.width, 44.0);
    // 
    self.definesPresentationContext = YES;
    self.searchController.searchBar.placeholder = @"编码,名称,编码+名称";
    self.searchController.searchBar.showsCancelButton = YES;
    UIButton *cancelButton = [self.searchController.searchBar valueForKey:@"_cancelButton"];
    [cancelButton setTitle:@"取消"forState:UIControlStateNormal];
    
    _autoPartsTableView.tableHeaderView = self.searchController.searchBar;
    
}

#pragma mark - UISearchBarDelegate

// Workaround for bug: -updateSearchResultsForSearchController: is not called when scope buttons change
- (void)searchBar:(UISearchBar *)searchBar selectedScopeButtonIndexDidChange:(NSInteger)selectedScope {
    [self updateSearchResultsForSearchController:self.searchController];
}
#pragma mark ** UISearchResultUpdating **
-(void)updateSearchResultsForSearchController:(UISearchController *)searchController{
    NSString *searchString = [self.searchController.searchBar text];
    
    [self updateFilteredContentForProductName:searchString];
    
    if (self.searchController.searchResultsController) {
        UINavigationController *navController = (UINavigationController *)self.searchController.searchResultsController;
        
        HZTSearchResultController *vc = (HZTSearchResultController *)navController.topViewController;
        vc.searchResults = self.searchResults;
        [vc.tableView reloadData];
    }

}


#pragma mark - Content Filtering
- (void)updateFilteredContentForProductName:(NSString *)productName{
    // Update the filtered array based on the search text and scope.
    if ((productName == nil) || [productName length] == 0) {
        self.searchResults = [_dataArray mutableCopy];
        return;
    }
    
    
    [self.searchResults removeAllObjects]; // First clear the filtered array.
    
    /*  Search the main list for products whose type matches the scope (if selected) and whose name matches searchText; add items that match to the filtered array.
     */
    for (HZAutoPartsModel *model  in _dataArray) {
            NSUInteger searchOptions = NSCaseInsensitiveSearch | NSDiacriticInsensitiveSearch;
            NSRange productNameRange = NSMakeRange(0, model.partsName.length);
            NSRange foundRange = [model.partsName rangeOfString:productName options:searchOptions range:productNameRange];
            if (foundRange.length > 0) {
                [self.searchResults addObject:model];
            }
        }
    }