updateSearchResults
函数由于某种原因未在我的视图表控制器视图中被调用,我不知道为什么?我已经看到了此answer,但是它与我的没有什么相似,并且我不想使用textDidChange
函数。
我有此视图SearchViewController
,其中它的顶部是搜索栏,而它的下面是收藏视图。 (使instagrams探索页面)。点击搜索栏后,它将显示视图SearchTableViewController
,该视图以表格视图显示搜索查询的结果。
这是我的代码:
SearchViewController(主视图):
import UIKit
class SearchViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let storyboard = UIStoryboard(name: "Main", bundle: nil)
guard let searchResultsViewController = storyboard.instantiateViewController(withIdentifier: "SearchResultsViewController") as? SearchTableViewController else { return}
let searchController = UISearchController(searchResultsController: searchResultsViewController)
searchController.searchResultsUpdater = searchResultsViewController
view.addSubview(searchController.searchBar)
definesPresentationContext = true
}
}
SearchTableViewController(随结果显示的视图):
import UIKit
import Firebase
class SearchTableViewController: UIViewController {
let languages = ["Mandarin Chinese", "English", "Hindustani", "Spanish", "Arabic", "Malay", "Russian", "Bengali", "Portuguese", "French", "Hausa", "Punjabi", "German", "Japanese", "Persian", "Swahili", "Telugu", "Javanese", "Wu Chinese", "Korean"]
var searchResults: [String] = []
@IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
tableView.dataSource = self
}
}
extension SearchTableViewController: UISearchResultsUpdating {
func updateSearchResults(for searchController: UISearchController) {
print("typing")
guard let searchText = searchController.searchBar.text else { return }
searchResults = languages.filter { $0.contains(searchText) }
tableView.reloadData()
}
}
extension SearchTableViewController: UITableViewDataSource {
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return searchResults.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "searchCell", for: indexPath)
let language = searchResults[indexPath.row]
cell.textLabel?.text = language
return cell
}
}
updateSearchResults
中的extension SearchTableViewController: UISearchResultsUpdating
没有被调用,我认为这是导致搜索结果未加载搜索查询数据的表视图的原因?
我也忘记将分配添加到导航控制器。即使您在另一个屏幕上显示搜索结果,也仍然需要添加它:
navigationItem.searchController = theSearchControllerYouInstantiated