搜索表格视图用的UISearchBar

Question

我使用此代码通过一个UITableView搜索：

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



if(searchText.length == 0) 
{ 
    isFiltered = FALSE; 
} 
else 
{ 
    isFiltered = TRUE; 


    if (filteredTableData == nil) 
     filteredTableData = [[NSMutableArray alloc] init]; 
    else 
     [filteredTableData removeAllObjects]; 

    for (NSString* string in self.itemArray) 
    { 
     NSRange nameRange = [string rangeOfString:searchBar.text options:(NSCaseInsensitiveSearch|NSDiacriticInsensitiveSearch)]; 
     if(nameRange.location != NSNotFound) 
     { 
      [filteredTableData addObject:string]; 
     } 
    } 
} 
[tableView reloadData]; 
[self.tableView reloadSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:UITableViewRowAnimationFade]; 
} 

一切工作正常，但如果我按下取消按钮，当我开始编辑出现，我的列表中不回来，但搜索结果仍然存在。为了显示列表，我必须开始输入，即使是搜索栏中的单个字符，然后删除它或按“x”查看所有列表。有没有办法阻止取消按钮？或者在按下时显示列表？

Answer 1

实现 - （无效）searchBarCancelButtonClicked：的UISearchBar的（*的UISearchBar）搜索栏 委托方法。在那里在filteredTableData数组中添加所有对象（表中的初始对象）并重新加载表。

-(void)searchBarCancelButtonClicked:(UISearchBar *)searchBar 
    {  
     [filteredTableData removeAllObjects]; 
     [filteredTableData addObjectsFromArray:self.itemArray]; 
     [tableView reloadData]; 
    } 

而且你不需要维护，如果你正在使用它选择数据源阵列重装表（表视图数据源的方法）标志isFiltered。例如

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{ 
    if(isFiltered) 
     return filteredTableData.count 
    else 
     return self.itemArray.count 
} 

如果你保持filteredTableData阵列的所有时间数据，你并不需要这样做。你的方法看起来喜欢 -

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{ 
     return filteredTableData.count 
} 

最初在控制器的初始化或viewDidLoad方法添加的所有对象filteredTableData，并且只使用这个数组重装表。

因此你的方法看起来喜欢 -

-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText 
{ 
    if(searchText.length == 0) 
    { 
     [filteredTableData removeAllObjects]; 
     [filteredTableData addObjectsFromArray:self.itemArray]; 
    } 
    else 
    { 
     [filteredTableData removeAllObjects]; 

     for (NSString* string in self.itemArray) 
     { 
      NSRange nameRange = [string rangeOfString:searchBar.text options:(NSCaseInsensitiveSearch|NSDiacriticInsensitiveSearch)]; 
      if(nameRange.location != NSNotFound) 
      { 
       [filteredTableData addObject:string]; 
      } 
     } 
    } 
    [tableView reloadData]; 
    } 

Answer 2

我不使用的方法，但使用以下和它完美的作品

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString 
{ 
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name CONTAINS[cd] %@",searchString]; 
    self.filteredCustomers = [[self.customers filteredArrayUsingPredicate:predicate] mutableCopy]; 

    return YES; 
} 

- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar 
{ 
    [self.searchDisplayController setActive:NO animated:NO]; 
    self.filteredCustomers = nil; 
    [self.tableView reloadData]; 
} 

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    static NSString *CellIdentifier = @"CustomerCell"; 
    NSDictionary *customerObject; 

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

    if (self.searchDisplayController.active) { 
     customerObject = [[NSDictionary alloc] initWithDictionary:[self.filteredCustomers objectAtIndex:indexPath.row]]; 
    } else { 
     customerObject = [[NSDictionary alloc] initWithDictionary:[[self.customerData objectAtIndex:indexPath.section] objectAtIndex:indexPath.row]]; 
    } 
    cell.textLabel.text = [customerObject objectForKey:@"name"]; 
    cell.customerName = [customerObject objectForKey:@"name"]; 
    cell.customerId = [customerObject objectForKey:@"customer_id"]; 

    return cell; 
}