如何用 UISearchBar 替换导航栏?

How to replace the navigation bar with an UISearchBar?

我想在显示后用搜索栏替换导航栏。

如果导航栏总是覆盖我的主视图控制器的内容,我会很好。


这样设置搜索控制器:

_searchController = [[UISearchController alloc] initWithSearchResultsController:[[MySearchViewController alloc] init]];
_searchController.delegate = self;
_searchController.obscuresBackgroundDuringPresentation = TRUE;
_searchController.hidesNavigationBarDuringPresentation = TRUE;
_searchController.searchBar.placeholder = @"Search...";
_searchController.searchBar.delegate = self;

显示这样的搜索控制器:

- (void)searchButtonTapped:(id)sender
{
  self.navigationItem.searchController = _searchController;
  [self.navigationController.view setNeedsLayout];
  [self.navigationController.view layoutIfNeeded];
  [self.navigationItem.searchController.searchBar becomeFirstResponder];
}

隐藏这样的搜索控制器:

- (void)willDismissSearchController:(UISearchController*)searchController
{
  self.navigationItem.searchController = nil;
  [self.navigationController.view setNeedsLayout];
}

我知道有一个 属性 searchController.hidesNavigationBarDuringPresentation 接近我想要的但完全正确。因为导航栏只会在我进入搜索栏时隐藏,但我希望它在我 显示 搜索栏时就已经隐藏了。

只要我按下导航栏中的搜索图标按钮,它就会被搜索控制器替换,并且只有搜索栏在顶部可见。有谁知道如何做到这一点?


我已经试过了:

我可以做出第一个选择

I would like to replace the navigation bar with the search bar once shown and back.

工作。

当显示 UISearchBar 时,我使用 显示和隐藏 左右蝙蝠按钮项目 的方法.

如果有更简单的方法来实现同样的目标,我会很感兴趣吗?

@interface MyViewController() <UISearchControllerDelegate, SearchDelegate>
@end

@implementation MyViewController
{
  UIView*                    _navigationItemTitleView;
  NSArray<UIBarButtonItem*>* _leftBarButtonItems;
  NSArray<UIBarButtonItem*>* _rightBarButtonItems;
}

- (void)viewDidLoad
{
  _searchController        = [[UISearchController alloc] initWithSearchResultsController:[[MySearchViewController alloc] init]];
  // ....
  _navigationItemTitleView = self.navigationItem.titleView;
  _leftBarButtonItems      = self.navigationItem.leftBarButtonItems;
  _rightBarButtonItems     = self.navigationItem.rightBarButtonItems;
}

- (void)searchButtonTapped:(id)sender
{
  // show the search bar in the navigation item
  self.navigationItem.leftBarButtonItems  = nil;
  self.navigationItem.rightBarButtonItems = nil;
  self.navigationItem.titleView = _searchController.searchBar;
  _searchController.active = TRUE;
}

- (void)willDismissSearchController:(UISearchController*)searchController
{
  // hide the search bar and restore previous state of the navigation item
  self.navigationItem.leftBarButtonItems  = _leftBarButtonItems;
  self.navigationItem.rightBarButtonItems = _rightBarButtonItems;
  self.navigationItem.titleView           = _navigationItemTitleView;
}