UISearchController с updateSearchResultsForSearchController

Question

Я нашел, как реализовать searchBar, но я не знаю, что делать в методе updateSearchResultsForSearchController. Все мои данные извлекаются из CoreData. Здесь я помещаю свой код. Если у кого-то была подобная проблема, пожалуйста, скажите мне, что делать.

@interface PlumbListTableViewController()<NSFetchedResultsControllerDelegate, UIPageViewControllerDelegate, UISearchBarDelegate, UISearchResultsUpdating, UISearchControllerDelegate> 

@property (nonatomic, strong) NSFetchedResultsController *fetchedResultsController; 
@property (nonatomic, strong) NSManagedObjectContext *managedObjectContext; 
@property (nonatomic, strong) NSArray *array; 
@property (nonatomic, strong) NSNumber *number; 
@property (nonatomic) int sum; 
@property (nonatomic, strong) PickerViewController *picker; 
@property (nonatomic, strong) UISearchController *searchController; 
@property (nonatomic, strong) NSMutableArray *fileteredTableData; 
@property (nonatomic, strong) NSArray *products; 
@property (nonatomic, strong) NSArray *recipies; 
@property (nonatomic, strong) NSArray *searchResults; 

@end 

@implementation PlumbListTableViewController 
-(void)viewDidLoad { 
    [super viewDidLoad]; 

    //All data from CoreData 
    self.products = [Product allProducts]; 
    self.searchResults = [NSMutableArray arrayWithCapacity:[self.products count]]; 

    [self.fetchedResultsController performFetch:nil]; 
    CoreDataStack *coreDataStack = [CoreDataStack defaultStack]; 
    NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"AddEntry"]; 
    fetchRequest.resultType = NSDictionaryResultType; 
    self.recipies = [coreDataStack.managedObjectContext executeFetchRequest:fetchRequest error:nil]; 

} 

-(void) viewWillAppear:(BOOL)animated { 
    [super viewWillAppear:YES]; 
    [self initializeSearchController]; 
    self.tabBarController.tabBar.hidden = NO; 
    [self showTotalSum]; 
    [self.tableView reloadData]; 
    } 


-(void)initializeSearchController { 
    //instantiate a search results controller for presenting the search/filter results (will be presented on top of the parent table view) 
    UITableViewController *searchResultsController = [[UITableViewController alloc] initWithStyle:UITableViewStylePlain]; 

    searchResultsController.tableView.dataSource = self; 

    searchResultsController.tableView.delegate = self; 

    //instantiate a UISearchController - passing in the search results controller table 
    self.searchController = [[UISearchController alloc] initWithSearchResultsController:searchResultsController]; 

    //this view controller can be covered by theUISearchController's view (i.e. search/filter table) 
    self.definesPresentationContext = YES; 


    //define the frame for the UISearchController's search bar and tint 
    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.searchController.searchBar.tintColor = [UIColor whiteColor]; 

    //add the UISearchController's search bar to the header of this table 
    self.tableView.tableHeaderView = self.searchController.searchBar; 


    //this ViewController will be responsible for implementing UISearchResultsDialog protocol method(s) - so handling what happens when user types into the search bar 
    self.searchController.searchResultsUpdater = self; 


    //this ViewController will be responsisble for implementing UISearchBarDelegate protocol methods(s) 
    self.searchController.searchBar.delegate = self; 
} 

-(void)updateSearchResultsForSearchController:(UISearchController *)searchController { 
} 

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { 
    if ([segue.identifier isEqualToString:@"edit"]) { 
     UITableViewCell *cell = sender; 
     NSIndexPath *indexPath = [self.tableView indexPathForCell:cell]; 
     UINavigationController *navigationController = segue.destinationViewController; 
     PlumbAddViewController *entryViewController = (PlumbAddViewController *)navigationController.topViewController; 
     entryViewController.entry = [self.fetchedResultsController objectAtIndexPath:indexPath]; 

    } 
} 


-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { 
    // Return the number of sections. 
    return self.fetchedResultsController.sections.count; 
} 

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { 
    // Return the number of rows in the section. 

     id <NSFetchedResultsSectionInfo> sectionInfo = [self.fetchedResultsController sections][section]; 
     return [sectionInfo numberOfObjects]; 
} 

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

    static NSString *CellIdentifier = @"Cell"; 
    ConfigureCellPlumb *cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath]; 


    AddEntry *entry = [self.fetchedResultsController objectAtIndexPath:indexPath]; 
    [cell configureCellforTable:entry]; 

    return cell; 

} 

-(NSFetchRequest *)entryListFetchRequest { 
    NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"AddEntry"]; 

    fetchRequest.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"date" ascending:NO]]; 

    return fetchRequest; 
} 

-(NSFetchedResultsController *)fetchedResultsController { 
    if (_fetchedResultsController != nil) { 
     return _fetchedResultsController; 
    } 

    CoreDataStack *coreDataStack = [CoreDataStack defaultStack]; 
    NSFetchRequest *fetchRequest = [self entryListFetchRequest]; 

    _fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:coreDataStack.managedObjectContext sectionNameKeyPath:@"sectionName" cacheName:nil]; 
    _fetchedResultsController.delegate = self; 

    return _fetchedResultsController;} 

Answer 1

Согласно документации, updateSearchResultsForSearchController: это «вызывается, когда текст в строке поиска или сфера изменилась или когда панель поиска становится первым ответчиком.»

Итак, в рамках этого метода вы хотите обновить таблицу, чтобы показать правильные результаты поиска. Это то, на что похожа моя (ваша будет выглядеть по-другому, но идея такая же):

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController 
{ 
    //make sure model has only results that correspond to the search 
    [self updateFilteredContentWithSearchText:[self.searchController.searchBar text]]; 
    //update the table now that the model has been updated 
    [self.specialtySearchResultsTVC.tableView reloadData]; 
} 

//helper method 
- (void)updateFilteredContentWithSearchText:(NSString*)searchText 
{ 
    [self.specialtySearchResultsTVC.filteredSpecialties removeAllObjects]; 
    for (Specialty *specialty in self.specialties) 
    { 
     NSRange nameRange = [specialty.name rangeOfString:searchText options:NSCaseInsensitiveSearch]; 
     if (nameRange.location != NSNotFound) 
     { 
      [self.specialtySearchResultsTVC.filteredSpecialties addObject:specialty]; 
     } 
    } 
}