Swift - UISearchController 不激活 - 没有光标 - 没有键盘

Question

我有一个 UICollectionView，里面有一个标题视图，导航栏的标题有一个 UISearchController。此代码适用于其他视图，但不适用于此 UICollectionView。我想把这个扔给 SO 社区，看看他们是否可以帮助我解决这个问题。

class ViewBusinessProfile: UICollectionViewController, UICollectionViewDelegateFlowLayout,  CLLocationManagerDelegate, UISearchControllerDelegate, UISearchBarDelegate, UISearchResultsUpdating {

 @IBOutlet var collectionViews: UICollectionView!

   
 var searchController : UISearchController!

override func viewDidLoad() {
    super.viewDidLoad()
    
    self.searchController = UISearchController(searchResultsController:  nil)
    self.searchController.searchResultsUpdater = self
    self.searchController.delegate = self
    self.searchController.searchBar.delegate = self
    self.searchController.hidesNavigationBarDuringPresentation = false
    self.searchController.dimsBackgroundDuringPresentation = true
    self.searchController.obscuresBackgroundDuringPresentation = false
    self.searchController.searchBar.placeholder = "search products..."
    //self.searchController.automaticallyShowsCancelButton = false
    self.searchController.definesPresentationContext = true
    searchController.searchBar.becomeFirstResponder()

    navigationItem.titleView = searchController.searchBar
    
    collectionViews.dataSource = self
    collectionViews.delegate = self

}

 func updateSearchResults(for searchController: UISearchController) {
}

我可以做些什么来调试或尝试追踪此问题？我在新的 UICollectionView 中重新创建了视图，并且出现了同样的问题。 SearchBar 是可见的，但无法触摸但 Back 按钮在导航栏上有效。

这三个视图都有 UISearchControllers，我在它们之间进行切换。最右边的那个就是发生这个问题的地方。左侧两个视图使用了相同的 UISearchController 代码，效果很好。

Answer 1

根据我看到的in this related solution，我想出了这个代码：

import UIKit

class SecondViewController: UIViewController, UISearchControllerDelegate, UISearchBarDelegate {

    var searchController : UISearchController!

    override func viewDidLoad() {
        super.viewDidLoad()
        addNavigationBarItems()
   }

    func addNavigationBarItems() {

        self.searchController = searchControllerWith(searchResultsController: nil)
        navigationItem.titleView = self.searchController.searchBar

        self.definesPresentationContext = true
    }

    func searchControllerWith(searchResultsController: UIViewController?) -> UISearchController {

        let searchController = UISearchController(searchResultsController: searchResultsController)
        searchController.delegate = self
        // searchController.searchResultsUpdater = self
        searchController.searchBar.delegate = self
        searchController.hidesNavigationBarDuringPresentation = false
        // dimsBackgroundDuringPresentation is deprecated as of iOS 12.0
        searchController.dimsBackgroundDuringPresentation = true
        searchController.searchBar.searchBarStyle = .prominent
        searchController.searchBar.backgroundImage = UIImage()
        searchController.searchBar.barTintColor = UIColor(red: 10/255, green: 150/255, blue: 255/255, alpha: 1) //rgb(10, green: 150, blue: 255)

        return searchController
    }

    func updateSearchResults(for searchController: UISearchController) {
    }

}

这假设父视图控制器中已经存在导航栏（即您不必创建新的 NavigationBar），结果应该如下所示：