Question

我正在使用搜索栏为tableview工作。当搜索文本发生变化时，我会调用tableView.reloadData来创建有关搜索结果的单元格。但是，即使我拨打tableView.reloadData，也不会调用cellForRowAtIndexPath。所以我没有关于搜索结果的任何单元格。

import UIKit

class RestaurantsViewController: UITableViewController,UISearchBarDelegate, UISearchResultsUpdating {

@IBOutlet weak var menuButton: UIBarButtonItem!

var restaurantsData = RestaurantsData()

override func viewDidLoad() {
    super.viewDidLoad()

    if self.revealViewController() != nil {
        menuButton.target = self.revealViewController()
        menuButton.action = #selector(SWRevealViewController.revealToggle(_:))
        self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
    }

    loadRestaurantsData()

    searchController.searchResultsUpdater = self
    searchController.dimsBackgroundDuringPresentation = false
    definesPresentationContext = true
    tableView.tableHeaderView = searchController.searchBar
}

private func loadRestaurantsData() {
    let 굽네치킨 = Restaurant(name: "굽네치킨", contact: "051-9196-0940", menus: ["고추바사삭":"20000원"])
    let 천궁반점 = Restaurant(name: "천궁반점", contact: "051-2254-0940", menus: ["간짜장":"5000원"])
    restaurantsData.addRestaurant("치킨", restaurant: 굽네치킨)
    restaurantsData.addRestaurant("중식", restaurant: 천궁반점)
}

// MARK: - UITableViewDelegates

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    if searchController.active && searchController.searchBar.text != "" {
        return 0
    }
    return restaurantsData.restaurantTypes.count
}

override func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
    return restaurantsData.restaurantTypes[section]
}

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    if searchController.active && searchController.searchBar.text != "" {
        return filteredRestaurants.count
    }
    return restaurantsData.restaurants[section].count
}

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath)
    let restaurant: Restaurant
    print("\(searchController.active), \(self.searchController.searchBar.text != "")")
    print(searchController.searchBar.text)
    print(searchText)
    print(2)
    if searchController.active && searchText != "" {
        restaurant = filteredRestaurants[indexPath.row]
        print("searched")
    } else {
        restaurant = restaurantsData.restaurants[indexPath.section][indexPath.row]
    }
    cell.textLabel?.text = restaurant.name
    return cell
}

// MARK: - UISearchBarDelegates

let searchController = UISearchController(searchResultsController: nil)
var searchText: String = ""
var filteredRestaurants = [Restaurant]() {
    didSet { print(filteredRestaurants) }
}

func filterContentForSearchText(searchText: String, scope: String = "All") {
    filteredRestaurants = restaurantsData.allRestaurants.filter { restaurant in
        return restaurant.info.containsString(searchText.lowercaseString)
    }
    print("REloaded")

    self.tableView.reloadData()
    print(3)
}

func updateSearchResultsForSearchController(searchController: UISearchController) {
    filterContentForSearchText(searchController.searchBar.text!)
    searchText = searchController.searchBar.text!
    print(1)
}

}

当我搜索时，filteredRestaurants数组会显示有关已过滤研究的信息，但不会出现在搜索结果表视图中，因为未调用cellForRowAtIndexPath。

Answer 1

当searchController在代码的这一部分处于活动状态时，您将返回0部分的数量。

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    if searchController.active && searchController.searchBar.text != "" {
        return 0
    }
    return restaurantsData.restaurantTypes.count
}

零部分是一个空表，没有单元格，这就是为什么cellForRowAtIndexPath没有被调用。

尝试将return 0替换为return 1，以便该表格中显示搜索结果的部分。

Answer 2

您在numberOfSectionsInTableView函数中有以下代码：

searchController.active && searchController.searchBar.text != ""

应该是（==而不是！=）：

searchController.active && searchController.searchBar.text == ""

调用tableView.reloadData时不调用cellForRowAtIndexPath

2 个答案: