Question

我已将UISearchDisplayController正确连接到IB中自定义UITableView的标头。但是，当我搜索任何内容时，searchResultsTableView仅显示“无结果”，而我似乎无法找到代码不正确的位置。

searchResults财产

- (NSMutableArray *)searchResults {
    if (!_searchResults) {
        _searchResults = [[NSMutableArray alloc] initWithCapacity:self.listingPreviews.count];
    }

    return _searchResults;
}

表格查看数据源方法

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    // Return the number of rows in the section.
    NSInteger numberOfRows = 0;

    if (tableView == self.tableView) {
        numberOfRows = self.listingPreviews.count;
    } else {
        numberOfRows = self.searchResults.count;
    }

    return numberOfRows;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"Listing";
    ListingPreviewTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (!cell) {
        cell = [[ListingPreviewTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    // Configure the cell.
    if (tableView == self.tableView) {
        cell.listingPreview = [self.listingPreviews objectAtIndex:indexPath.row];
    } else {
        NSLog([[self.searchResults objectAtIndex:indexPath.row] title]);
        cell.listingPreview = [self.searchResults objectAtIndex:indexPath.row];
    }

    return cell;
}

搜索栏代表方法

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText {
    NSInteger searchTextLength = searchText.length;

    for (ListingPreview *listingPreview in self.listingPreviews) {
        if ((listingPreview.title.length >= searchTextLength) && ([listingPreview.title rangeOfString:searchText].location != NSNotFound)) {
            [self.searchResults addObject:listingPreview];
        }
    }
}

Answer 1

试试这个：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Listing";
ListingPreviewTableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];

// Configure the cell.
if (tableView == self.tableView) {
    cell.listingPreview = [self.listingPreviews objectAtIndex:indexPath.row];
} else {
    NSLog([[self.searchResults objectAtIndex:indexPath.row] title]);
    cell.listingPreview = [self.searchResults objectAtIndex:indexPath.row];
}

return cell;

}

请注意，更改适用于：

ListingPreviewTableViewCell * cell = [ self.tableView dequeueReusableCellWithIdentifier：CellIdentifier];

这样你就可以从你自己的tableView中解除Cell，而不是从UISearchDisplayController创建的那个。

Answer 2

似乎代码中没有任何内容强制searchDisplayController重新加载它的searchResultTableView。

标准方法是设置UISearcDisplayController's委托（请注意协议 - UISearchDisplayDelegate）并实施– searchDisplayController:shouldReloadTableForSearchString:

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {

    // perform your search here and update self.searchResults
    NSInteger searchStringLength = searchString.length;

    for (ListingPreview *listingPreview in self.listingPreviews) {
        if ((listingPreview.title.length >= searchStringLength) && ([listingPreview.title rangeOfString:searchString].location != NSNotFound)) {
            [self.searchResults addObject:listingPreview];
        }
    }

    // returning YES will force searchResultController to reload search results table view
    return YES;
}

UISearchDisplayController在searchResultsTableView中不显示结果

2 个答案: