快速解析 - 在表格视图单元格中取消固定项目

Question

我想从解析中取消固定我的 tableview 单元格中的项目。我将对象保存在另一个页面上，并在主页中查询它，将该对象添加到数组中，以便它可以显示在表格视图中。现在我不确定如何使用数组中的内容正确选择相应的解析对象，以便我可以取消固定它。

理想情况下，我想使用 objectId 来执行此操作，以防用户保存具有相同名称的对象。如何获取单元格中显示的内容的 objectId 并取消固定它？

我使用什么查询将我的对象添加到数组中，然后显示在我的表格视图中

var selectedLighthouse: localData? = nil


var arrayToPopulateCells = [localData]()


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib
    //query
        let query = PFQuery(className: "ParseLighthouse")

        query.fromLocalDatastore()
        query.whereKey("User", equalTo: PFUser.currentUser()!)
        query.findObjectsInBackgroundWithBlock { (objects, error) -> Void in
            if error == nil {
                // The find succeeded.
                println("Successfully retrieved \(objects!.count) lighthouses.")
                // Do something with the found objects
                if let lighthouse = objects {

                    self.arrayToPopulateCells.removeAll(keepCapacity: true)

                    for object in lighthouse {

                        var singleData = localData()
                        singleData.name = object["Name"] as! String
                        singleData.note = object["Note"] as! String
                        singleData.date = object["Date"] as! String
                        singleData.latt = object["Latt"] as! NSNumber
                        singleData.longi = object["Longi"] as! NSNumber
                        singleData.lattDelta = object["LattDelta"] as! NSNumber
                        singleData.longiDelta = object["LongiDelta"] as! NSNumber
                        singleData.locality = object["Locality"] as! String


                        self.arrayToPopulateCells.append(singleData)

                    }

                }
            } else {
                // Log details of the failure
                println("Error: \(error!) \(error!.userInfo!)")
            }

        }
    //setting table view datasource and delegate.
    self.tableView.dataSource = self
    self.tableView.delegate = self

    var currentUser = PFUser.currentUser()
    println(currentUser)


}




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



    // var lighthouse = self.lighthouses[indexPath.row]
    var data = self.arrayToPopulateCells[indexPath.row]

    //setting the prototype cell to link with the identifier set in attributes earlier.
    let cell = tableView.dequeueReusableCellWithIdentifier("locationCell") as! lighthouseCell

    let row = indexPath.row
    cell.cellName.text = data.name
    cell.cellPlace.text = data.locality
    // cell.cellCoordinates.text = "\(lighthouse.latt)" + ", " + "\(lighthouse.longi)"
    // cell.cellNote.text = lighthouse.note
    cell.cellDate.text = "\(data.date)"

    return cell
}






func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    self.selectedLighthouse = self.arrayToPopulateCells[indexPath.row]
    self.performSegueWithIdentifier("lighthouseDetailViewSegue", sender: self)
}



func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
    return true
}

func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
    if (editingStyle == UITableViewCellEditingStyle.Delete) {
        var arrayObjectId = localData()
        var queryLocal = PFQuery(className:"ParseLighthouse")
        queryLocal.fromLocalDatastore()
        queryLocal.whereKey("Name", equalTo: arrayObjectId.name)
        queryLocal.getObjectInBackgroundWithId(arrayObjectId.name) {
            (parseLighthouse: PFObject?, error: NSError?) -> Void in
            if error == nil && parseLighthouse != nil {
                parseLighthouse?.unpinInBackground()
            } else {
                println(error)
            }
        }
        self.arrayToPopulateCells.removeAtIndex(indexPath.row)
        tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
    }
}

Answer 1

在 commitediting() 方法中，您不需要再次查询，因为您的数组已经包含来自 parse 的所有数据，因此您只需直接从数组中删除然后 reloadData()。

你只需要：

if (editingStyle == UITableViewCellEditingStyle.Delete)
{
  var object:PFObject = self.arrayToPopulateCells[indexPath.row] as! PFObject
 object.deleteInBackgroundWithBlock() // so check the if error == nil 
 self.arrayToPopulateCells.removeAtIndex(indexPath.row)
 tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
 self.tableView.reloadData()
 }