-(void)searchDisplayController:(UISearchDisplayController *)controller didHideSearchResultsTableView:(UITableView *)tableView
{
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}

-(void)searchDisplayController:(UISearchDisplayController *)controller willShowSearchResultsTableView:(UITableView *)tableView
{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(resSetFrame:) name:UIKeyboardWillHideNotification object:nil];
}

- (void)resSetFrame:(NSNotification*)notification
{
    CGFloat height = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size.height;
    UITableView *tableView = [[self searchDisplayController] searchResultsTableView];
    UIEdgeInsets inset;
    //49 我加上 49 是因为 还有tabbar 在显示 没有隐藏
    [[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0 ? (inset = UIEdgeInsetsMake(0, 0, height + 49, 0)) : (inset = UIEdgeInsetsZero);
    [tableView setContentInset:inset];
    [tableView setScrollIndicatorInsets:inset];
}

------------分割线-----------------

附带 更改 cancel 变更为 “取消”

-(void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar
{
    your_searchBar.showsCancelButton = YES;
    self.navigationController.navigationBar.hidden = YES;
    //将 cancel 改成 取消 并且显示白色
    for(id item in [searchBar.subviews[0] subviews])
    {
        NSLog(@"%@",item);
        if([item isKindOfClass:[UIButton class]])
        {
            UIButton *btn = (UIButton *)item;
            [btn setTitle:@"取消" forState:UIControlStateNormal];
            btn.tintColor = [UIColor whiteColor];
            [btn setNeedsDisplay];
        }
    }
}