UISearchController 未在 VC 中顯示

Question

I am implementing a collection view controller in a ViewController which has a variable that is a UISearchController, i tried initializing it thanks based on this source code https://github.com/codeWithCal/TableViewExample/blob/SearchFilter/TableViewExample/TableViewController.swift

我唯一的問題是 searchBar 及其過濾器 scope 沒有顯示。 這是我的代碼

父類型：

class ContactListParent:UIViewController, UISearchResultsUpdating, UISearchBarDelegate

變量：

 let search = UISearchController()

初始化函數：

 func initSearchCont(){
        search.loadViewIfNeeded()
        search.searchResultsUpdater = self
        search.obscuresBackgroundDuringPresentation = false
        search.searchBar.enablesReturnKeyAutomatically = false
        search.searchBar.returnKeyType = UIReturnKeyType.done
        definesPresentationContext = true
        navigationItem.searchController = search
        navigationItem.hidesSearchBarWhenScrolling = false
        search.searchBar.scopeButtonTitles = ["All", "Dogs", "Cats"]
        search.searchBar.delegate = self
    }

viewDidLoad 周期：

         super.viewDidLoad()
            
            initArr()
// INIT Below
            initSearchCont()
//
    //        search.view.backgroundColor = .yellow
            self.view.addSubview(search.view)
            let layout = UICollectionViewFlowLayout()
            contVC = ContactVC(collectionViewLayout: layout)
            contVC?.CLV = self
            self.addChild(contVC!) //100kb
            contVC?.view.frame = CGRect(x: 0, y: bounds.height*0.2, width: bounds.width, height:  bounds.height)
            self.view.addSubview(contVC!.view)
            contVC?.didMove(toParent: self)

Answer 1

刪除此處不需要的搜索變量，如果您分配給navigationitem，則無需添加addsubview 即可查看。

這是它將在 NavigationBar 中顯示 SearchBar 的示例代碼。

注意：確保將 UINavigationController 分配給 ViewController

class ViewController: UIViewController {

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

   func configureSearchbar(){
        let searchController = UISearchController(searchResultsController: nil)
        searchController.searchBar.placeholder = "Search"
        searchController.searchResultsUpdater = self
        searchController.obscuresBackgroundDuringPresentation = false
        navigationItem.searchController = searchController
        self.title = "Contacts" //Navigation Title
        self.definesPresentationContext = true
    }
}