Ios 使用另一个视图控制器（带有表视图）显示UISearchController的结果

我有两个视图控制器。第一个CityViewController包含一个搜索栏，因此它的配置在那里完成。第二个是CitySearchViewController，用于显示搜索结果，我需要自定义单元格，这就是为什么我不简单地使用UITableViewController的原因。以下是用于在第一视图控制器内配置搜索控制器的代码：

class CityViewController: UIViewController {

var searchController: UISearchController?

var citySearchViewController: CitySearchViewController?

override func viewDidLoad() {
    super.viewDidLoad()


    citySearchViewController = CitySearchViewController()
    searchController = UISearchController(searchResultsController: citySearchViewController)

    //Setting the search controller
    setSearchController()
}


//Setting the search controller
private func setSearchController() {
    if let searchController = searchController {
        searchController.searchResultsUpdater = citySearchViewController
        searchController.obscuresBackgroundDuringPresentation = true
        searchController.hidesNavigationBarDuringPresentation = false
        searchController.searchBar.placeholder = "Search for a city"
        navigationItem.searchController = searchController
        definesPresentationContext = true
        searchController.searchBar.returnKeyType = .done
        //searchController.searchBar.enablesReturnKeyAutomatically = false
        searchController.searchBar.delegate = self

    }
   } 
}



extension CityViewController: UISearchBarDelegate {
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
    searchController?.isActive = false
   } 
} 

因此，我将第二个视图控制器CitySearchViewController设置为searchResultsController。在里面我有一个城市数组，视图控制器是数据源和表视图的委托，表视图在其中

以下是视图控制器内部的完整代码

class CitySearchViewController: UIViewController {

@IBOutlet weak var tableView: UITableView! {
    didSet {
        tableView.delegate = self
        tableView.dataSource = self
    }
}


  let cities = [City(name: "Saint Petersburg", coordinates: CLLocation(latitude: 59.93863, longitude: 30.31413)), City(name: "Moscow", coordinates: CLLocation(latitude: 55.75222, longitude: 37.61556)), City(name: "London", coordinates: CLLocation(latitude: 51.509865, longitude: -0.118092)), City(name: "Chicago", coordinates: CLLocation(latitude: 41.881832, longitude: -87.623177)), City(name: "Sochi", coordinates: CLLocation(latitude: 43.588348, longitude: 39.729996)), City(name: "Madrid", coordinates: CLLocation(latitude: 40.416775, longitude: -3.703790)), City(name: "New York", coordinates: CLLocation(latitude: 40.730610, longitude: -73.935242)), City(name: "Paris", coordinates: CLLocation(latitude: 48.864716, longitude: 2.349014)), City(name: "Amsterdam", coordinates: CLLocation(latitude: 52.370216, longitude: 4.895168)), City(name: "Barcelona", coordinates: CLLocation(latitude: 41.390205, longitude: 2.154007))]
var filteredCities = [City]()



override func viewDidLoad() {
    super.viewDidLoad()

}



private func filterContentForSearchText(_ searchText: String) {
    filteredCities = cities.filter({ (city) -> Bool in
        return city.name.lowercased().contains(searchText.lowercased())
    })
    tableView.reloadData()

 } 

extension CitySearchViewController: UITableViewDataSource {

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return filteredCities.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "citySearchCell", for: indexPath) as! CitySearchTableViewCell
    let filteredCity = filteredCities[indexPath.row]
    cell.cityLabel.text = filteredCity.name

    return cell
}

 }

extension CitySearchViewController: UITableViewDelegate {
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return UITableViewAutomaticDimension
  }
 }

 extension CitySearchViewController: UISearchResultsUpdating {
func updateSearchResults(for searchController: UISearchController) {
    filterContentForSearchText(searchController.searchBar.text!)
 }
}

在那里，我进行了基本的表视图设置，还过滤了数组并相应地更新了表视图

问题是，只要我开始在搜索栏中点击一个单词，我就会得到一个异常。原因是CitySearchViewController中的表视图为零。因此，我认为，从CityViewController中的以下代码行初始化视图控制器时，我做错了一些事情：

class CityViewController: UIViewController {

var searchController: UISearchController?

var citySearchViewController: CitySearchViewController?

override func viewDidLoad() {
    super.viewDidLoad()


    citySearchViewController = CitySearchViewController()
    searchController = UISearchController(searchResultsController: citySearchViewController)

    //Setting the search controller
    setSearchController()
}


//Setting the search controller
private func setSearchController() {
    if let searchController = searchController {
        searchController.searchResultsUpdater = citySearchViewController
        searchController.obscuresBackgroundDuringPresentation = true
        searchController.hidesNavigationBarDuringPresentation = false
        searchController.searchBar.placeholder = "Search for a city"
        navigationItem.searchController = searchController
        definesPresentationContext = true
        searchController.searchBar.returnKeyType = .done
        //searchController.searchBar.enablesReturnKeyAutomatically = false
        searchController.searchBar.delegate = self

    }
   } 
}



extension CityViewController: UISearchBarDelegate {
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
    searchController?.isActive = false
   } 
} 

我还尝试从故事板实例化视图控制器，但是，在这种情况下，我得到了一个错误，即在初始化过程中没有使用具有故事板ID的视图控制器。我已经检查并重新检查了视图控制器的id，它与代码中使用的id完全相同。以下是我尝试从第一个one CityViewController实例化CitySearchViewController的初始方法

class CitySearchViewController: UIViewController {

@IBOutlet weak var tableView: UITableView! {
    didSet {
        tableView.delegate = self
        tableView.dataSource = self
    }
}


  let cities = [City(name: "Saint Petersburg", coordinates: CLLocation(latitude: 59.93863, longitude: 30.31413)), City(name: "Moscow", coordinates: CLLocation(latitude: 55.75222, longitude: 37.61556)), City(name: "London", coordinates: CLLocation(latitude: 51.509865, longitude: -0.118092)), City(name: "Chicago", coordinates: CLLocation(latitude: 41.881832, longitude: -87.623177)), City(name: "Sochi", coordinates: CLLocation(latitude: 43.588348, longitude: 39.729996)), City(name: "Madrid", coordinates: CLLocation(latitude: 40.416775, longitude: -3.703790)), City(name: "New York", coordinates: CLLocation(latitude: 40.730610, longitude: -73.935242)), City(name: "Paris", coordinates: CLLocation(latitude: 48.864716, longitude: 2.349014)), City(name: "Amsterdam", coordinates: CLLocation(latitude: 52.370216, longitude: 4.895168)), City(name: "Barcelona", coordinates: CLLocation(latitude: 41.390205, longitude: 2.154007))]
var filteredCities = [City]()



override func viewDidLoad() {
    super.viewDidLoad()

}



private func filterContentForSearchText(_ searchText: String) {
    filteredCities = cities.filter({ (city) -> Bool in
        return city.name.lowercased().contains(searchText.lowercased())
    })
    tableView.reloadData()

 } 

extension CitySearchViewController: UITableViewDataSource {

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return filteredCities.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "citySearchCell", for: indexPath) as! CitySearchTableViewCell
    let filteredCity = filteredCities[indexPath.row]
    cell.cityLabel.text = filteredCity.name

    return cell
}

 }

extension CitySearchViewController: UITableViewDelegate {
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return UITableViewAutomaticDimension
  }
 }

 extension CitySearchViewController: UISearchResultsUpdating {
func updateSearchResults(for searchController: UISearchController) {
    filterContentForSearchText(searchController.searchBar.text!)
 }
}

我没有使用另一个视图控制器来显示搜索控制器的结果，所以我想我做错了什么

如果您知道我做错了什么或知道正确的方法，我将感谢您的帮助。

问题1 如果您正在通过以下方式初始化CitySearchViewController：

这意味着它将跳过您在Interface Builder中为该视图控制器在情节提要中设置的任何内容，最重要的是，将IBOutlet设置为tableView

问题2 您还指出，您试图用这行代码将其实例化为CitySearchViewController，但出现了一个错误，即找不到具有该标识符的VC：

citySearchViewController = UIStoryboard().instantiateViewController(withIdentifier: "searchCityTableView") as? CitySearchViewController

因为您没有指定脚本的名称来实例化VC，所以可能是错误的。您需要将情节提要的名称指定为：

citySearchViewController = UIStoryboard(name: "<storyboard filename here>", bundle: nil).instantiateViewController(withIdentifier: "searchCityTableView") as? CitySearchViewController

---

哪里有类似搜索故事板的东西，名为Search.storyboard

好的，现在我明白原因了，谢谢。正如我在问题中所说的，我也尝试从故事板中实例化它，但是每次我得到关于id的错误时，我都会检查多次。知道为什么会这样吗？@TigranIskandaryan是的，把我的补充信息作为问题2Oh的一部分，太愚蠢了。。。感谢您的帮助，只要堆栈允许，我将接受您的回答：

citySearchViewController = UIStoryboard().instantiateViewController(withIdentifier: "searchCityTableView") as? CitySearchViewController

citySearchViewController = UIStoryboard(name: "<storyboard filename here>", bundle: nil).instantiateViewController(withIdentifier: "searchCityTableView") as? CitySearchViewController