UISearchDisplayController在沒有結果時顯示自定義的UITableViewCell

Question

我有一個由一些自定義的UITableViewCells和一個連接到它的UISearchDisplayController組成的UITableView。如果在搜索某些內容時沒有結果，如何顯示另一個自定義表格視圖單元格？

下面是搜索和表視圖功能是如何模樣：

- (void)searchTableList:(UISearchBar*)searchBar { 
    NSString *searchString = searchBar.text; 

    for (NSArray *section in _celebs) 
     for (NSDictionary *row in section) { 
      if ([[row[@"name"] lowercaseString] rangeOfString:[searchString lowercaseString]].location!=NSNotFound) 
      [filteredContentList addObject:row]; 
    } 

} 

- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar { 
    isSearching = YES; 
} 

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText { 

    [filteredContentList removeAllObjects]; 

    if (searchText.length) { 
     isSearching = YES; 
     [self searchTableList:searchBar]; 
    } else isSearching = NO; 
} 

- (void)searchDisplayControllerDidEndSearch:(UISearchDisplayController *)controller{ 
} 

- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar { 
    isSearching = NO; 
} 

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

#pragma mark - Table view data source 

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { 
    return [tableView isEqual:self.searchDisplayController.searchResultsTableView]?1:_objects.count; 
} 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { 
    return [tableView isEqual:self.searchDisplayController.searchResultsTableView]?filteredContentList.count:[_objects[section] count]; 
} 

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section { 
    return [tableView isEqual:self.searchDisplayController.searchResultsTableView]?0:25; 
} 

- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForHeaderInSection:(NSInteger)section { 
    return [self tableView:tableView heightForHeaderInSection:section]; 
} 

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { 
    return 55; 
} 

- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath { 
    return [self tableView:tableView heightForRowAtIndexPath:indexPath]; 
} 

- (NSDictionary *)getObjectFromIndexPath:(NSIndexPath*)indexPath tableView:(UITableView*)tableView { 
    BOOL search = [tableView isEqual:self.searchDisplayController.searchResultsTableView]; 
    if (search) 
     return indexPath.row<filteredContentList.count?filteredContentList[indexPath.row]:nil; 
    else return indexPath.section<_objects.count? 
     (indexPath.row<[_objects[indexPath.section] count]?_objects[indexPath.section][indexPath.row]:nil) 
     :nil; 
} 

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

    BOOL search = [tableView isEqual:self.searchDisplayController.searchResultsTableView]; 

    FirstTableViewCell *cell; 
    NoResultsTableViewCell *cell1; 

    if (tableView == self.searchDisplayController.searchResultsTableView) { 
     cell = (FirstTableViewCell*)[self.tableView dequeueReusableCellWithIdentifier:@"FirstTableViewCell"]; 
    } else { 
     cell = (FirstTableViewCell*)[self.tableView dequeueReusableCellWithIdentifier:@"FirstTableViewCell" forIndexPath:indexPath]; 
    } 

    NSDictionary *object = [self getObjectFromIndexPath:indexPath tableView:tableView]; 
    if (!object) return cell; 
    cell.object = celeb; 
    cell.objectName.text = [object objectForKey:@"name"]; 

    } 
    } 

    return cell; 
} 

Answer 1

進行一些更改象下面這樣：

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { 
    if ([tableView isEqual:self.searchDisplayController.searchResultsTableView]){ 
     if (filteredContentList.count > 0){ 
      return filteredContentList.count; 
     }else{ 
      return 1; // the number of custom cells when there're no results 
     } 
    }else{ 
     return [_objects[section] count]; 
    } 
}  

- (NSDictionary *)getObjectFromIndexPath:(NSIndexPath*)indexPath tableView:(UITableView*)tableView { 
    BOOL search = [tableView isEqual:self.searchDisplayController.searchResultsTableView]; 
    if (search) 
     return indexPath.row < filteredContentList.count? filteredContentList[indexPath.row]: theCustomCellDict; // use theCustomCellDict instead of nil 
    else return indexPath.section < _objects.count? 
     (indexPath.row < [_objects[indexPath.section] count]? _objects[indexPath.section][indexPath.row]: nil) 
     :nil; 
}  

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 
    BOOL isSearch = [tableView isEqual:self.searchDisplayController.searchResultsTableView]; 
    FirstTableViewCell *cell; 
    NoResultsTableViewCell *noReultsCell; 
    if ((isSearch && filteredContentList.count > 0) || !isSearch){ 
     cell = (FirstTableViewCell *)[self.tableView dequeueReusableCellWithIdentifier:@"FirstTableViewCell" forIndexPath:indexPath]; 
     NSDictionary *object = [self getObjectFromIndexPath:indexPath tableView:tableView]; 
     if (!object) return cell; 
     cell.object = celeb; 
     cell.objectName.text = [object objectForKey:@"name"]; 
     return cell; 
    }else{ 
     noResultsCell = (NoResultsTableViewCell *)[self.tableView dequeueReusableCellWithIdentifier:@"NoResultsTableViewCell" forIndexPath:indexPath]; 
     NSDictionary *object = [self getObjectFromIndexPath:indexPath tableView:tableView]; 
     if (!object) return noResultsCell; 
     noResultsCell.object = celeb; 
     noResultsCell.objectName.text = [object objectForKey:@"name"]; 
     return noResultsCell 
    } 
} 

Answer 2

如果你想只顯示信息（例如沒有結果發現'東西'）你不需要使用UITableViewCells。我會推薦你​​去看DZNEmptyDataSet庫。

GitHub鏈接https://github.com/dzenbot/DZNEmptyDataSet