parse.com swift-取消固定并删除tableView单元格中的对象

Question

im making an app that currently saves a parse object to the local datastore, and to parse.com. I then run a query, save each object into an array so that i can display it in a table view. everything up to this point works well thanks to my past posted questions here and here .

so now the info is being displayed correctly as i had hoped. but now, i would like to be able to delete the entries as well. I would like to swipe the table and when delete is tapped, the object is unpinned from the local datastore, and that same item is removed from the cloud as well.

here is my current code for this :

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



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

    let cell = tableView.dequeueReusableCellWithIdentifier("locationCell") as! lighthouseCell

    let row = indexPath.row
    cell.cellName.text = data.name
    cell.cellPlace.text = data.locality

    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) {

        self.arrayToPopulateCells.removeAtIndex(indexPath.row)
        tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
    }
}

where "arrayToPopulateCells" is where the parse objects get stored during my query.

obviously im able to remove the cell at indexpath.row, but how to i take the information in that cell, and find the matching parse object to unpin and delete?

Answer 1

Using this delegate u can get reference of lighthouseCell and using that u can get variable and

func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {

if (editingStyle == UITableViewCellEditingStyle.Delete) {

     var selectedCell = tableView.cellForRowAtIndexPath(indexPath) as lighthouseCell
        gameScore.removeObjectForKey("playerName")
        self.arrayToPopulateCells.removeAtIndex(indexPath.row)
        tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
}
}

using selectedCell and then

selectedCell.data.removeObjectForKey("keyName")

and for delete parse data we have Delete Object for particular key

Answer 2

Assuming the objects in your array are actual PFObject instances, then just call deleteInBackground before you remove them from your data array.

So:

func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
    if (editingStyle == UITableViewCellEditingStyle.Delete) {
        self.arrayToPopulateCells[indexPath.row].deleteInBackground() // Delete from cloud
        self.arrayToPopulateCells.removeAtIndex(indexPath.row)
        tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
    }
}