Question

我以编程方式创建了一个UISearchBar和UISearchDisplayController。视图控制器是一个UITableViewController。 @interface StockTableViewController () <UISearchDisplayDelegate, UISearchBarDelegate>您可以看到以下代码。但是当我在搜索栏中输入时，不会调用shouldReloadTableForSearchString，包括其他UISearchDisplayDelegate方法。

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.searchResults = [NSArray array];

    UISearchBar *searchBar = [[UISearchBar alloc] init];
    searchBar.barStyle = UISearchBarStyleDefault;
    searchBar.searchBarStyle = UISearchBarStyleDefault;
    searchBar.showsCancelButton = YES;
    searchBar.showsScopeBar = NO;
    searchBar.delegate = self;

    UISearchDisplayController *searchDisplayController = [[UISearchDisplayController alloc] initWithSearchBar:searchBar contentsController:self];
    searchDisplayController.delegate = self;
    searchDisplayController.searchResultsDataSource = self;
    searchDisplayController.searchResultsDelegate = self;

    self.tableView.tableHeaderView = searchBar;
}

- (void)searchDisplayControllerWillBeginSearch:(UISearchDisplayController *)controller
{
    NSLog(@"searching"); //not showed up in the console
}

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
    NSLog(@"%@", searchString); //not showed up in the console
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name LIKE %@", searchString];
    NSArray *results = [Stock MR_findAllSortedBy:@"createdDate" ascending:NO withPredicate:predicate];
    if ([results count] > 0) {

        self.searchResults = results;
        [self.searchDisplayController.searchResultsTableView reloadData];
    }
    return YES;
}

Answer 1

它不起作用，因为您正在将UISearchDisplayController创建为局部变量，这会导致在viewDidLoad超出范围时将其解除分配。因此，为搜索显示控制器创建一个强大的属性，然后它应该正常工作（如果你命名属性，你将会遇到命名冲突，searchDisplayController，所以称之为其他）。

未调用UISearchDisplayDelegate方法

1 个答案: