UISearchDisplayController does not update search results - ios

Question

I have the following search setup in my app:
- (UISearchBar*)searchBar
{
if (!_searchBar) {
_searchBar = [[UISearchBar alloc] init];
_searchBar.delegate = self;
_searchBar.placeholder = kSearchBarPlaceHolder;
}
return _searchBar;
}
- (UISearchDisplayController*)searchBarDisplayContr
{
if (!_searchBarDisplayContr) {
_searchBarDisplayContr = [[UISearchDisplayController alloc] initWithSearchBar:self.searchBar contentsController:self];
_searchBarDisplayContr.delegate = self;
_searchBarDisplayContr.searchResultsDataSource = self.tableView.dataSource;
_searchBarDisplayContr.searchResultsDelegate = self.tableView.delegate;
_searchBarDisplayContr.searchResultsTableView.backgroundColor = [UIColor clearColor];
_searchBarDisplayContr.searchResultsTableView.separatorStyle = UITableViewCellSeparatorStyleNone;
}
return _searchBarDisplayContr;
}
- (NSMutableArray *)searchResults
{
if (!_searchResults) {
_searchResults = [NSMutableArray arrayWithCapacity:_restaurants.count];
}
return _searchResults;
}
- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
[self.searchResults removeAllObjects];
[self.restaurants enumerateObjectsUsingBlock:^(Restaurant *restaurant, NSUInteger idx, BOOL *stop) {
if ([scope isEqualToString:#"All"] || [restaurant.name isEqualToString:scope]) {
NSRange range = [restaurant.name rangeOfString:searchText
options:(NSCaseInsensitiveSearch | NSDiacriticInsensitiveSearch)];
if (range.length > 0) {
[self.searchResults addObject:restaurant];
}
}
}];
}
- (BOOL)searchDisplayController:(UISearchDisplayController*)controller shouldReloadTableForSearchString:(NSString*)searchString
{
[self filterContentForSearchText:searchString
scope:#"All"];
dispatch_async(dispatch_get_main_queue(), ^(void) {
for (UIView *v in controller.searchResultsTableView.subviews) {
if ([v isKindOfClass:[UILabel class]]) {
((UILabel *)v).text = kSearchResultsTableViewNoResultsLabel;
((UILabel *)v).font = [UIFont mediumFontOfSize:20.0f];
((UILabel *)v).textColor = [UIColor blackColor];
break;
}
}
});
return YES;
}
- (BOOL)searchDisplayController:(UISearchDisplayController*)controller shouldReloadTableForSearchScope:(NSInteger)searchOption
{
[self filterContentForSearchText:[self.searchBarDisplayContr.searchBar text]
scope:#"All"];
return YES;
}
But for some reason when I search the searchResultsTableView is not updated / cellForRowAtIndexPath is not called. The tableView delegates and DataSource is setup in my storyboard.
Any ideas why this is happening?
UPDATE:
[self.tableView registerClass:[RestaurantsCell class] forCellReuseIdentifier:cellIdentifier];
[self.searchBarDisplayContr.searchResultsTableView registerClass:[RestaurantsCell class] forCellReuseIdentifier:cellIdentifier];
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView*)tableView numberOfRowsInSection:(NSInteger)section
{
if (tableView == self.searchBarDisplayContr.searchResultsTableView) {
return [self.searchResults count];
} else {
return [self.restaurants count];
}
return 0;
}
- (UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath
{
RestaurantsCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
Restaurant *restaurant;
if (tableView == self.searchBarDisplayContr.searchResultsTableView) {
if (self.searchResults.count > 0) {
restaurant = self.searchResults[indexPath.row];
}
} else {
if (self.restaurants.count > 0) {
restaurant = self.restaurants[indexPath.row];
}
}
if (restaurant) {
cell.titleLabel.text = restaurant.name;
}
return cell;
}

Answer 1

This is the offending line:
RestaurantsCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
Should be:
RestaurantsCell *cell = [self.tableView dequeueReusableCellWithIdentifier:cellIdentifier];
Explanation:
If the tableView turns out to be your search results table view, then trying to dequeue a cell with an identifier won't work because it doesn't have prototype cells. Therefore, you have to use self.tableView
Also, your code can be cleaned up a lot:
- (NSInteger)tableView:(UITableView*)tableView numberOfRowsInSection:(NSInteger)section
{
return (tableView == self.tableView) ? self.restaurants.count : self.searchResults.count;
}
- (UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath
{
RestaurantsCell *cell = [self.tableView dequeueReusableCellWithIdentifier:cellIdentifier];
Restaurant *restaurant = (tableView == self.tableView) ? self.restaurants[indexPath.row] ? self.searchResults[indexPath.row];
}
cell.titleLabel.text = restaurant.name;
return cell;
}
Edit
Check out this example