UISearchbar 搜索按钮更换 代码实现UISearchbar去除第一响应

[self.view addSubview:[self creatTableView]];

-(UISearchBar *)searchBar
{
    mySearchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, BOUND_WIDTH, 44)];
    mySearchBar.delegate = self;
    [self searchDisplay];
    [mySearchBar setPlaceholder:@"搜索学校"];
    //遍历UISearchbar中所有试图  找到UItextField
    for(UIView *subView in [mySearchBar subviews]) {
    //As of iOS 7 beta 5,
        if([subView conformsToProtocol:@protocol(UITextInputTraits)]) {
        //改变搜索按钮名称
            [(UITextField *)subView setReturnKeyType: UIReturnKeyDone];
        } else {
            for(UIView *subSubView in [subView subviews]) {
                if([subSubView conformsToProtocol:@protocol(UITextInputTraits)]) {
                    [(UITextField *)subSubView setReturnKeyType: UIReturnKeyDone];
                }
            }      
        }
    }
     // Set the return key and keyboard appearance of the search bar
//    for (UIView *searchBarSubview in [tableSearchBar subviews]) {
//        
//        if ([searchBarSubview conformsToProtocol:@protocol(UITextInputTraits)]) {
//            
//            @try {
//                
//                [(UITextField *)searchBarSubview setReturnKeyType:UIReturnKeyDone];
//                [(UITextField *)searchBarSubview setKeyboardAppearance:UIKeyboardAppearanceAlert];
//            }
//            @catch (NSException * e) {
//                
//                // ignore exception
//            }
//        }
//    }
    return mySearchBar;
}



-(void)searchDisplay
{
    searchDisplayController = [[UISearchDisplayController alloc]initWithSearchBar:mySearchBar contentsController:self];
    searchDisplayController.active = NO;
    searchDisplayController.searchResultsDataSource = self;
    searchDisplayController.searchResultsDelegate = self;
}

-(UITableView *)creatTableView
{
    tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, mySearchBar.frame.size.height, self.view.frame.size.width, self.view.frame.size.height-mySearchBar.frame.size.height) style:UITableViewStyleGrouped];
    tableView.delegate = self;
    tableView.dataSource = self;
    tableView.tableHeaderView = [self searchBar];
    [self hideExcessLine:tableView];
    return tableView;
}

//取消按钮执行方法
-(void)searchBarCancelButtonClicked:(UISearchBar *)searchBar
{
}
//搜索按钮执行方法
- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar
{
    //代码去除第一响应
    [searchDisplayController setActive:NO animated:YES];
}

//原帖地址
http://stackoverflow.com/questions/4728338/iphone-uisearchbar-done-button-always-enabled