ios - TableView不显示数据

Question

我正在尝试用从 GET 请求收到的一些数据填充我的 UITableView。我不知道为什么，但如果在我的 numberOfRowsInSection 中，我返回一个代表信息的特定值(例如 8)。如果 y 返回由请求填充的数组的值，则 UITableView 不会添加任何行:

class DashboardTableViewController: UITableViewController {

    var userData = [String]()
    var secondUserData = [String]()
    var name: String = ""

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

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
    }

    /* This function gets the user account information from a JSON in a simple request */
    private func loadUserData(completion: @escaping (_ myArray: [String]) -> Void) {
        let session = Twitter.sharedInstance().sessionStore.session()
        let client = TWTRAPIClient.withCurrentUser()
        let userInfoURL = "https://api.twitter.com/1.1/users/show.json"
        let params = ["user_id": session?.userID]
        var clientError : NSError?
        let request = client.urlRequest(withMethod: "GET", url: userInfoURL, parameters: params, error: &clientError)

        client.sendTwitterRequest(request) { (response, data, connectionError) -> Void in
            if connectionError != nil {
                print("Error: \(connectionError)")
            }

            do {
                let json = JSON(data: data!)
                if  let userName = json["name"].string,
                    let description = json["description"].string,
                    let followersCount = json["followers_count"].int,
                    let favouritesCount = json["favourites_count"].int,
                    let followingCount = json["friends_count"].int,
                    let lang = json["lang"].string,
                    let nickname = json["screen_name"].string {
                        self.userData.append(userName)
                        self.userData.append(nickname)
                        self.userData.append(String(followersCount))
                        self.userData.append(String(followingCount))
                        self.userData.append(String("22"))
                        self.userData.append(lang)
                        self.userData.append(description)
                        self.userData.append("No country")

                        completion(self.userData)
                }
            }
        }
    }

    /* This closure helps us to fill the labels once the request has been finished in loadUserData */
    func manageUserData(label: UILabel, index: Int) {
        loadUserData {
            (result: [String]) in
            label.text = result[index]
        }
    }

    // MARK: - Table view data source
    override func numberOfSections(in tableView: UITableView) -> Int {
        // #warning Incomplete implementation, return the number of sections
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete implementation, return the number of rows
        return self.userData.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let rowNumber = indexPath.row
        let cellIdentifier = "TableViewCell"
        guard let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as? TableViewCellController else {
            fatalError("The dequeued cell is not an instance of TableViewCellController.")
        }

        switch rowNumber {
        case 0:
            cell.titlePlaceholder.text = "Name:"
            manageUserData(label: cell.valuePlaceholder, index: rowNumber)
        case 1:
            cell.titlePlaceholder.text = "Nickname:"
            manageUserData(label: cell.valuePlaceholder, index: rowNumber)
        case 2:
            cell.titlePlaceholder.text = "Followers:"
            manageUserData(label: cell.valuePlaceholder, index: rowNumber)
        case 3:
            cell.titlePlaceholder.text = "Following:"
            manageUserData(label: cell.valuePlaceholder, index: rowNumber)
        case 4:
            cell.titlePlaceholder.text = "Tweets:"
            manageUserData(label: cell.valuePlaceholder, index: rowNumber)
        case 5:
            cell.titlePlaceholder.text = "Language:"
            manageUserData(label: cell.valuePlaceholder, index: rowNumber)
        case 6:
            cell.titlePlaceholder.text = "Biography:"
            manageUserData(label: cell.valuePlaceholder, index: rowNumber)
        case 7:
            cell.titlePlaceholder.text = "Country:"
            manageUserData(label: cell.valuePlaceholder, index: rowNumber)
        default:
            cell.titlePlaceholder.text = "?"
            cell.valuePlaceholder.text = "?"
        }

        return cell
    }
}

知道为什么会发生这种情况吗？非常感谢!!

更新!

我解决了这个问题，在loadUserData()函数内的completion()之后添加self.tableView.reloadData()。希望对您有帮助!

Answer 1

快速解决方案:

tableView.reloadData()

如果您不是从主线程调用它:

DispatchQueue.main.async {
    self.tableView.reloadData()
}