UISearchController - 搜索欄在觸摸時從包裝中消失

Question

看起來像一個常見的iOS錯誤，但我已經嘗試了所有可找到的解決方案，並且沒有看到任何結果。

我創建一個UISearchController並將其添加到UIView包裝是這樣的：

self.searchController = [[SearchController alloc] initWithSearchResultsController:nil]; 
self.searchController.searchResultsUpdater = self; 
self.searchController.searchBar.delegate = self; 

[self.searchBarWrapper addSubview:self.searchController.searchBar]; 
[self.searchController.searchBar sizeToFit]; 

的問題是，只要在搜索欄被觸摸，鍵盤彈出，但整個搜索欄中消失。

我看着這些帖子：

• My UISearchBar in UISearchController disappear when I start searching. Why?
• iOS 9 searchBar disappears from table header view when UISearchController is active
• UISearchController searchBar disappears on first click
• Disappearing UISearchController in a TableViewController that is in a UINavigationController
• UITableView disappears when UISearchController is active and a new tab is selected
• Search Bar disappears after tap on it
• UISearchController searchBar in tableHeaderView animating out of the screen
• search bar getting disappeared in ios UIsearchcontroller
• Search Bar disappeared from view while typing

，並試圖每一個解決方案，最終將這個初始化代碼：

self.searchController.hidesNavigationBarDuringPresentation = NO; 
self.definesPresentationContext = NO; 
self.navigationController.definesPresentationContext = YES; 
self.navigationController.extendedLayoutIncludesOpaqueBars = YES; 
self.extendedLayoutIncludesOpaqueBars = YES; 

而且這些委託功能

- (void)willPresentSearchController:(UISearchController *)searchController { 
    // definitely runs, if I put a breakpoint here it stops 
    self.navigationController.navigationBar.translucent = YES; 
    [self.searchBarWrapper addSubview:self.searchController.searchBar]; 
    searchController.searchResultsController.view.hidden = NO; 
} 

-(void)willDismissSearchController:(UISearchController *)searchController{ 
    self.navigationController.navigationBar.translucent = NO; 
    searchController.searchResultsController.view.hidden = NO; 
} 

但搜索欄還是消失了恩，感動。我還能嘗試什麼？

我認爲我的代碼和其他帖子之間的區別在於，我使用不帶XIB的編程創建的UIViewController。有一個UITableView子視圖，但它不直接與搜索欄進行交互。沒有UINavigationBar，搜索欄位於視圖的頂部。

UPDATE：

這是我的看法相對於搜索欄層次：

- UIViewController 
- UIView 
    - UIScrollView 
    - UIViewController 
    - UIView 
    - UISearchBar 

Answer 1

有一對夫婦的事情，我會建議。

1. 在viewDidLoad中

   // after creating the searchController add 
   self.mySearchController.active = YES; 
   
   // also add this for the search bar 
   [self.mySearchController.searchBar setAutoresizingMask: UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight]; 
   

我成立了一個簡單的測試應用程序。頂部添加了一個UIView（這將是searchBarWrapper）。受限的頂部，領先，尾隨，並給它一個固定的高度。在下面添加了一個tableView，使用prototypeCell並將它限制爲Top，Leading，Trailing，Bottom ---簡單簡單，沒有什麼特別之處。所有的作品都很好。

我可以發佈整個viewControllerClass，如果你需要它。

Answer 2

我有同樣的確切問題。對我來說固定的是在searchBarWrapper中添加錨點，然後在viewDidLayoutSubviews中再次添加錨點。基本上我不得不添加他們兩次：

@IBOutlet weak var searchBarWrapper: UIView! 
fileprivate var searchController: UISearchController! 

//MARK:- View Controller Lifecycle 
override func viewDidLoad() { 
     super.viewDidLoad() 

     setSearchController() 
} 

override func viewDidLayoutSubviews() { 
     super.viewDidLayoutSubviews() 

     positionSearchControllerInWrapperView() 
} 

//MARK:- Custom Funcs 
fileprivate func setSearchController(){ 
     searchController = UISearchController(searchResultsController: nil) 
     searchController.delegate = self 
     searchController.searchBar.delegate = self 
     searchController.searchResultsUpdater = self 
     searchController.searchBar.showsCancelButton = false 
     searchController.searchBar.placeholder = "Search man..." 
     searchController.searchBar.returnKeyType = .done 
     searchController.dimsBackgroundDuringPresentation = false 
     searchController.hidesNavigationBarDuringPresentation = false 
     searchController.searchBar.endEditing(true) 
     searchController.searchBar.sizeToFit() 

     definesPresentationContext = true 
     navigationItem.hidesBackButton = true 

     positionSearchControllerInWrapperView() 
} 

//this gets called TWICE 
fileprivate func positionSearchControllerInWrapperView(){ 
     searchBarWrapper.addSubview(searchController.searchBar) 
     searchController.searchBar.translatesAutoresizingMaskIntoConstraints = false 
     searchController.searchBar.leftAnchor.constraint(equalTo: searchBarWrapper.leftAnchor).isActive = true 
     searchController.searchBar.rightAnchor.constraint(equalTo: searchBarWrapper.rightAnchor).isActive = true 
     searchController.searchBar.topAnchor.constraint(equalTo: searchBarWrapper.topAnchor).isActive = true 
     searchController.searchBar.bottomAnchor.constraint(equalTo: searchBarWrapper.bottomAnchor).isActive = true 
}