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几个月前，我问了一个问题来展示 UISearchDisplayController，它的工作原理很吸引人，但是

现在，在用户点击searchResultsController 的tableview 单元格并选择一个单元格并隐藏searchResultsController以显示 MapView后，我正在呈现另一个控制器，但是一旦您点击搜索栏searchResultsController不会显示，但是一旦您按下取消按钮并再次点击搜索栏它再次开始工作。

Scenario 正是 Apple 的 Maps 应用程序打开最喜欢的视图以及带有段的最近视图控制器。

这是我的 UISearchControllerDelegate 代码：

- (void)willPresentSearchController:(UISearchController *)searchController
{
    mainViewController *__weak weakSelf=self;
    dispatch_async(dispatch_get_main_queue(), ^{
        mainViewController *__strong strongSelf = weakSelf;
        strongSelf.searchController.searchResultsController.view.hidden = NO;
    });
}

- (void)didPresentSearchController:(UISearchController *)searchController
{
    self.searchController.searchResultsController.view.hidden = NO;
}

这是我的 UISearchBarDelegate 代码。

- (BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar{

    mainViewController *__weak weakSelf=self;
    dispatch_async(dispatch_get_main_queue(), ^{
        mainViewController *__strong strongSelf = weakSelf;
        strongSelf.searchController.searchBar.showsCancelButton = YES;
    });

    self.searchController.searchResultsController.view.hidden = NO;
    return YES;
}

- (BOOL)searchBarShouldEndEditing:(UISearchBar *)searchBar{
    mainViewController *__weak weakSelf=self;
    dispatch_async(dispatch_get_main_queue(), ^{
        mainViewController *__strong strongSelf = weakSelf;
        strongSelf.searchController.searchBar.showsCancelButton = NO;
    });

    return YES;
}

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar{
    mainViewController *__weak weakSelf=self;
    dispatch_async(dispatch_get_main_queue(), ^{
        mainViewController *__strong strongSelf = weakSelf;
        strongSelf.searchController.searchResultsController.view.hidden = YES;
    });

    [searchBar resignFirstResponder];
    }];
}
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