Question

我可以从Parse Core中检索我的“项目”对象，然后将“projectname”值返回给我并打印到日志中。我认为这些值会更新我的productNames数组，然后在我的TableView中显示。我的原型tableview单元格在DealCell类中定义，带有图像和标签。当我运行应用程序时，我的tableView是空的。我错过了什么？

我的TableView的课程：

final_data

我的打印输出很奇怪，它看起来像这样，但它成功地获得了项目名称：

var productIds = [String]()
var productNames = [String]()

override func viewDidLoad() {
    super.viewDidLoad()

    self.productIds.removeAll(keepCapacity: true)
    self.productNames.removeAll(keepCapacity: true)

    // Ask for the current user's personal list of saved PFObject IDs.
    let Ids = PFUser.currentUser()?.objectForKey("accepted") as! NSArray
    print(Ids)

    // Requesting the Project objects based on the Ids retrieved.
    let projectRetrieval = PFQuery(className: "project")
    projectRetrieval.whereKey("objectId", containedIn: Ids as [AnyObject])
    projectRetrieval.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
        if let objects = objects {
            for object in objects {

                //Append the productNames array with retrieved projectnames
                self.productNames.append(object["projectname"] as! String)

                // This line successfully prints the array of product Names retrieved.
                print("Projectnames: \(self.productNames)")

            }
        }
    })

}

// Number of Rows
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return self.productNames.count;
}

// Assign the productNames to the labels in each cell.
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    let cell = self.tableView.dequeueReusableCellWithIdentifier("dealcell", forIndexPath: indexPath) as! DealCell

    cell.productName.text = self.productNames[indexPath.row] 

    return cell

}

Answer 1

您应该使用此方法刷新您的tableview;

self.tableView.reloadData()

您可以将此代码放在您的findObjectsInBackgroundWithBlock回调闭包之后;

projectRetrieval.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
        if let objects = objects {
            for object in objects {

                //Append the productNames array with retrieved projectnames
                self.productNames.append(object["projectname"] as! String)

                // This line successfully prints the array of product Names retrieved.
                print("Projectnames: \(self.productNames)")

            }
        }
       self.tableView.reloadData()
    })

难以检索解析对象字段值

1 个答案: