显示高音时间轴但是空的

Question

我在社交媒体上练习很快，我正在学习如何将Twitter时间线添加到App App的教程。一切似乎都没问题，但唯一的问题是显示推文的表格是完全空的。代码如下......

import UIKit
import Social
import Accounts

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {


    @IBOutlet weak var tweetTableView: UITableView!

    var dataSource = [AnyObject]()


    func getTimeLine() {

        let account = ACAccountStore()
        let accountType = account.accountType(
        withAccountTypeIdentifier: ACAccountTypeIdentifierTwitter)

        account.requestAccessToAccounts(with: accountType, options: nil, completion: {(success, error) in

            if success {
                let arrayOfAccounts =
                account.accounts(with: accountType)

                if (arrayOfAccounts?.count)! > 0 {
                    let twitterAccount = arrayOfAccounts?.last as! ACAccount

                    let requestURL = URL(string:
                    "https://api.twitter.com/1.1/statuses/user_timeline.json")

                    let parameters = ["screen_name" : "@techotopia",
                                  "include_rts" : "0",
                                  "trim_user" : "1",
                                  "count" : "20"]

                    let postRequest = SLRequest(forServiceType:
                    SLServiceTypeTwitter,
                                            requestMethod: SLRequestMethod.GET,
                                            url: requestURL,
                                            parameters: parameters)

                    postRequest?.account = twitterAccount

                    postRequest?.perform(handler: {(responseData, urlResponse, error) in

                        do {
                            try self.dataSource = JSONSerialization.jsonObject(with: responseData!, options: JSONSerialization.ReadingOptions.mutableLeaves) as! [AnyObject]

                            if self.dataSource.count != 0 {
                                DispatchQueue.main.async() {
                                    self.tweetTableView.reloadData()
                                }
                            }
                        } catch let error as NSError {
                        print("Data serialization error: \(error.localizedDescription)")
                        }
                    })
                }
            } else {
                print("Failed to access account")
            }
        })
    }




    override func viewDidLoad() {
        super.viewDidLoad()

        tweetTableView.register(UITableViewCell.self,
                            forCellReuseIdentifier: "Cell")
        getTimeLine()
        tweetTableView.estimatedRowHeight = 50

        }

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


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


    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell =
        tableView.dequeueReusableCell(withIdentifier: "Cell")
        let row = indexPath.row
        let tweet = self.dataSource[row]
        cell!.textLabel!.text = tweet.object(forKey: "text") as? String
        cell!.textLabel!.numberOfLines = 0
        return cell!

    }

}

结果如下......

感谢您的回答！谢谢！