UISearchBar 搜索框详解手机开发

///在 .h 写代理 <UITableViewDelegate,UITableViewDataSource,UISearchBarDelegate> 
///结合UITableView 展示了UISearchBar  
  
_searchArray = [[NSMutableArray alloc] init]; 
    _dataArray = [[NSMutableArray alloc] initWithObjects:@"qq", @"tencent", @"NOKIA", @"samsung", @"google", @"apple", @"MicroSoft", @"htc", nil]; 
      
    _tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 20, 320, 460) style:UITableViewStylePlain]; 
    _tableView.delegate = self; 
    _tableView.dataSource = self; 
    [self.view addSubview:_tableView]; 
    [_tableView release]; 
      
    UISearchBar* searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, 320, 84)]; 
    _tableView.tableHeaderView = searchBar; 
    //类型 
    //searchBar.barStyle = UIBarStyleBlack; 
    //占位符 
    searchBar.placeholder = @"请输入搜索内容"; 
    //副标题 
    //searchBar.prompt = @"这是什么?"; 
    //显示按钮 
    searchBar.showsBookmarkButton = YES; 
    searchBar.showsCancelButton = YES; 
    searchBar.showsSearchResultsButton = YES; 
    searchBar.showsScopeBar = YES; 
    [searchBar setScopeButtonTitles:[NSArray arrayWithObjects:@"a", @"b", @"c", @"d",nil]]; 
    //设置代理 
    searchBar.delegate = self; 
      
      
      
      
    - (void)searchBar:(UISearchBar *)searchBar selectedScopeButtonIndexDidChange:(NSInteger)selectedScope{ 
    NSArray* array = [NSArray arrayWithObjects:@"a", @"b", @"c", @"d",nil]; 
    NSString* str = [array objectAtIndex:selectedScope]; 
    searchBar.text = str; 
} 
  
//搜索 
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText{ 
    //如果搜索栏为空，代表我们没有在搜索，tableView需要显示原数据。如果不为空，代表我们在搜索，tableView要显示搜索结果 
    if (searchBar.text == nil || [searchBar.text isEqualToString:@""]) { 
        _isSearch = NO; 
    } else { 
        _isSearch = YES; 
        [_searchArray removeAllObjects]; 
        for (NSString* str in _dataArray) { 
            //判断str里面是否包含searchBar.text 
            NSRange range = [str rangeOfString:searchBar.text]; 
            if (range.location != NSNotFound) { 
                [_searchArray addObject:str]; 
            } 
        } 
    } 
    [_tableView reloadData]; 
} 
  
- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar{ 
    [searchBar resignFirstResponder]; 
} 
  
  
  
  
//tableView delegate 
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{ 
    if (_isSearch) { 
        return _searchArray.count; 
    } 
    return _dataArray.count; 
} 
  
- (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ 
    UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:indexPath.row%2==0?@"IDRed":@"IDBlue"]; 
    if (cell == nil) { 
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:indexPath.row%2==0?@"IDRed":@"IDBlue"] autorelease]; 
        if (indexPath.row%2 == 0) { 
            cell.contentView.backgroundColor = [UIColor redColor]; 
        } else { 
            cell.contentView.backgroundColor = [UIColor blueColor]; 
        } 
    } 
      
    if (_isSearch) { 
        cell.textLabel.text = [_searchArray objectAtIndex:indexPath.row]; 
    } else { 
        cell.textLabel.text = [_dataArray objectAtIndex:indexPath.row]; 
    } 
      
      
      
    return cell; 
}