UISearchBar 搜索框

///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;

}</pre>