问XCode7，Swift 2，使用解析数据填充TableView

EN

import UIKit
import Parse
import Bolts

class ViewController: UIViewController, UITableViewDelegate {

@IBOutlet var tableView: UITableView!

var Header = [String]()




let reuseIdentifier = "ContentCell"
private let cellHeight: CGFloat = 210
private let cellSpacing: CGFloat = 20

@IBOutlet var barButton: UIButton!

override func viewDidLoad() {
    super.viewDidLoad()
    let navBar = self.navigationController!.navigationBar
    navBar.barTintColor = UIColor(red: 6.0 / 255.0, green: 100.0 / 255.0, blue: 255.0 / 255.0, alpha: 1)
    navBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.whiteColor()]

    var query = PFQuery(className: "Announcements")
    query.orderByDescending("createdAt")
    query.findObjectsInBackgroundWithBlock {
        (posts:[PFObject]?, error: NSError?) -> Void in

        if error == nil {
            //success fetching announcements

            for alert in posts! {
                print(alert)
            self.Header.append(alert["Header"] as! String)
            }

            /***Reload The Table***/

            print(self.Header.count)

            self.tableView.reloadData()

        } else {
            print(error)

        }
}

}

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int{

    return Header.count
    //turns announcements into rows

}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell{

    let singleCell: AnnouncementCellTableViewCell = tableView.dequeueReusableCellWithIdentifier("AnnouncementBlock") as! AnnouncementCellTableViewCell

    singleCell.HeaderText.text = Header[indexPath.row]

    return singleCell


}