///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;  }