使用UISearchBar搜索表视图 [英] Searching a table view with UISearchBar

问题描述

我正在使用以下代码在UItableView中进行搜索:

I am using this code to search through a UItableView:

-(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];
}

一切正常，但是如果我按开始编辑时出现的取消按钮，则列表不会再显示，但搜索结果仍然存在.要显示列表，我必须开始输入，甚至在搜索栏中输入单个字符，然后将其删除或按"x"查看所有列表.有没有办法阻止取消按钮?还是要在按下列表时显示列表?

Everything works fine, but if I press the cancel button which appears when I start editing, my list doesn't come back, but the search results remain. To show back the list, I have to begin typing, even a single character in the searchbar and then delete it or press the "x" to see all the list. Is there a way to block the cancel button? Or to show the list when it is pressed?

推荐答案

实现-(void)searchBarCancelButtonClicked:(UISearchBar *)searchBar UISearchBar的委托方法.在该表中，将所有对象(表中的初始对象)添加到filteredTableData数组中，然后重新加载表.

Implement - (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar delegate method of UISearchBar. In that add all objects(initial objects in table) in filteredTableData array and reload table.

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

如果您使用它来选择数据源数组以重载表(在表视图数据源方法中)，则也不需要维护isFiltered标志.例如

Also you don't need to maintain flag isFiltered if you are using it for choosing data source array for reloading table(in table view data source methods). e.g.

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

如果您一直都在filteredTableData数组中维护数据，则无需执行此操作.您的方法看起来像-

If you maintain data in filteredTableData array all time, you don't need to do this. Your method will look like-

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

最初在控制器的init或viewDidLoad方法中，将所有对象添加到filteredTableData中，并仅使用此数组重新加载表.

Initially in init or viewDidLoad method of controller add all objects in filteredTableData and use only this array for reloading table.

因此您的方法将如下所示-

Hence your method will look like-

 -(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]; 
    }

这篇关于使用UISearchBar搜索表视图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！