Comment implémenter UISearchController avec objectif c

Initialiser les choses Suivantes que par étapes.

1) Protocole de déclaration en <UISearchBarDelegate, UISearchControllerDelegate, UISearchResultsUpdating> dans le .h classe d'interface

2) Déclarer les propriétés suivantes

//Fetch result controller 
@property (nonatomic, strong) UISearchController *searchController;

//for the results to be shown with two table delegates
@property (nonatomic, strong) CLCustomerResultrowsItemsCellController *searchResultsController;

//this custom controller is only suppose to have number of rows and cell for row function of table datasource

3) Pour la restauration de l'état

 @property BOOL searchControllerWasActive;
 @property BOOL searchControllerSearchFieldWasFirstResponder;

4) permet d'Initialiser le code de cette étape dans le ViewDidload

_searchResultsController = [[CLChatContactsSearchResultController alloc] init];
_searchController = [[UISearchController alloc] initWithSearchResultsController:_searchResultsController];

self.searchController.searchResultsUpdater = self;
self.searchController.searchBar.placeholder = nil; 
[self.searchController.searchBar sizeToFit];
self.contactsTableView.tableHeaderView = self.searchController.searchBar;


//we want to be the delegate for our filtered table so didSelectRowAtIndexPath is called for both tables
self.searchResultsController.tableView.delegate = self;
self.searchController.delegate = self;
self.searchController.dimsBackgroundDuringPresentation = YES; //default is YES
self.searchController.searchBar.delegate = self; //so we can monitor text changes + others

//Search is now just presenting a view controller. As such, normal view controller
//presentation semantics apply. Namely that presentation will walk up the view controller
//hierarchy until it finds the root view controller or one that defines a presentation context.
//
self.definesPresentationContext = YES;  //know where you want UISearchController to be displayed

5) Utilisez les Bouton de même entamer le contrôleur et le passé de ces fonctions pour un usage futur si tout voir les commentaires

#pragma mark - UISearchBarDelegate

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
    [searchBar resignFirstResponder];
}


#pragma mark - UISearchControllerDelegate

//Called after the search controller's search bar has agreed to begin editing or when
//'active' is set to YES.
//If you choose not to present the controller yourself or do not implement this method,
//a default presentation is performed on your behalf.
//
//Implement this method if the default presentation is not adequate for your purposes.
//
- (void)presentSearchController:(UISearchController *)searchController {

}

- (void)willPresentSearchController:(UISearchController *)searchController {
    //do something before the search controller is presented
}

- (void)didPresentSearchController:(UISearchController *)searchController {
    //do something after the search controller is presented
}

- (void)willDismissSearchController:(UISearchController *)searchController {
    //do something before the search controller is dismissed
}

- (void)didDismissSearchController:(UISearchController *)searchController {
    //do something after the search controller is dismissed
}

6) Sur la recherche dans le texte que vous obtenez ce rappel à l'

#pragma mark - UISearchResultsUpdating

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

    //update the filtered array based on the search text
    NSString *searchText = searchController.searchBar.text;

    id <NSFetchedResultsSectionInfo> sectionInfo = [_fetchedResultsController.sections objectAtIndex:0];

    if (searchText == nil) {

        //If empty the search results are the same as the original data
        self.searchResults = [sectionInfo.objects mutableCopy];

    } else {

        NSMutableArray *searchResults = [[NSMutableArray alloc] init];

        NSArray *allObjects = sectionInfo.objects;

        for (PhoneNumber *phoneMO in allObjects) {

            if ([phoneMO.number containsString:searchText] || [[phoneMO.closrr_id filteredId] containsString:searchText] || [[phoneMO.contact.fullname lowercaseString] containsString:[searchText lowercaseString]]) {
                [searchResults addObject:phoneMO];
            }
        }

        self.searchResults = searchResults;

    }

    //hand over the filtered results to our search results table
    CLCustomerResultrowsItemsCellController *tableController = (CLCustomerResultrowsItemsCellController *)self.searchController.searchResultsController;
    tableController.filteredContacts = self.searchResults;
    [tableController.tableView reloadData];
}

7) Vous devez déclarer le filteredContacts propriété dans la classe Personnalisée qui permettra de combler les éléments recherchés .

8) c'est ça , en fait, sélectionnez la rangée de comparer la vue de la table si ses le contrôleur principal ou de la coutume classe de contrôleur de la vue de la table et de faire l'opération pour l'élément sélectionné.

Espère que cela est utile.