Ios 如何用UISearchBar替换导航栏？

我想用搜索栏取代导航栏，一旦显示和返回

或

如果导航栏总是覆盖我的主视图控制器的内容，我会很好

---

我设置搜索控制器如下：

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

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

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

我像这样显示搜索控制器：

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

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

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

我像这样隐藏搜索控制器：

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

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

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

我知道有一个属性

searchController.hidesNavigationBarDuringPresentation

，它很接近我想要的内容，但非常准确。因为导航栏只在我进入搜索栏时隐藏，但我希望它在我显示搜索栏时已经隐藏

只要我按下导航栏中的搜索图标按钮，它就会被替换为搜索控制器，并且只有搜索栏在顶部可见。有人知道如何做到这一点吗

---

我已经试过了：

• 使用

  [self.navigationController setNavigationBarHidden:YES动画：NO]显示搜索控制器时隐藏导航栏

• 控制搜索栏高度约束并根据可见性进行更改的步骤
• 要将搜索控制器设置为

  navigationItem.titleView

  ->，这不是我想要的
• 要根据visivility隐藏搜索控制器->导航栏保持相同高度，仅隐藏搜索控制器
• 使用，但这似乎是一个不同的设置，我需要什么
• 滚动时查看了self.navigationItem.HideseArchBar，但这不适用，因为我不使用表视图控制器

---

我可以选择
我想用搜索栏取代导航栏，一旦显示和返回
工作
当显示UISearchBar时，我使用了显示和隐藏导航项的左键和右键按钮项的方法
如果有更简单的方法实现同样的目标，我会很感兴趣

@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;
}

@接口MyViewController（）
@结束
@MyViewController的实现
{
UIView*_导航项目标题视图；
NSArray*_LeftBarbuttonims；
NSArray*_RightBarbuttonims；
}
-（无效）viewDidLoad
{
_searchController=[[UISearchController alloc]initWithSearchResultsController:[[MySearchViewController alloc]init]]；
// ....
_navigationItemTitleView=self.navigationItem.titleView；
_LeftBarButtonims=self.navigationItem.LeftBarButtonims；
_RightBarButtonims=self.navigationItem.RightBarButtonims；
}
-（无效）搜索按钮已标记：（id）发件人
{
//在导航项中显示搜索栏
self.navigationItem.LeftBarButtonims=nil；
self.navigationItem.RightBarButtonims=nil；
self.navigationItem.titleView=\u searchController.searchBar；
_searchController.active=TRUE；
}
-（无效）willDismissSearchController:（UISearchController*）searchController
{
//隐藏搜索栏并恢复导航项的以前状态
self.navigationItem.leftBarButtonItems=_leftBarButtonItems；
self.navigationItem.rightBarButtonItems=_rightBarButtonItems；
self.navigationItem.titleView=\u navigationItemTitleView；
}