didSelectRowAtIndexPath method at PFQueryTableViewController

Question

I am creating my first app using Parser with iOS. Now I have just a tableview with Parse objects, but I am not able to tap on a row and open a view controller to show the selected object details. This is how am I getting the objects from Parse:

- (id)initWithCoder:(NSCoder *)aCoder {
    self = [super initWithCoder:aCoder];
    if (self) {
        // Customize the table

        // The className to query on
        self.parseClassName = @"cadenas";

        // The key of the PFObject to display in the label of the default cell style
        self.textKey = @"chain_name";

        // Uncomment the following line to specify the key of a PFFile on the PFObject to display in the imageView of the default cell style
        // self.imageKey = @"image";

        // Whether the built-in pull-to-refresh is enabled
        self.pullToRefreshEnabled = YES;

        // Whether the built-in pagination is enabled
        self.paginationEnabled = YES;

        // The number of objects to show per page
        self.objectsPerPage = 25;
    }
    return self;
}

- (PFQuery *)queryForTable {
    PFQuery *query = [PFQuery queryWithClassName:@"cadenas"];


    if ([self.objects count] == 0) {
        query.cachePolicy = kPFCachePolicyCacheThenNetwork;
    }

    [query orderByAscending:@"createdAt"];

    return query;
}

This is my cellForRowAtIndexPath method:

- (UITableViewCell *)tableView:(UITableView *)tableView
         cellForRowAtIndexPath:(NSIndexPath *)indexPath
                        object:(PFObject *)object {
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle
                                      reuseIdentifier:CellIdentifier];
    }

    // Configure the cell to show todo item with a priority at the bottom
    cell.textLabel.text = [object objectForKey:@"chain_name"];

    return cell;
}

And this the didSelectRowAtIndexPath method:

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    Detalle_ChainViewController *detailViewController =[self.storyboard instantiateViewControllerWithIdentifier:@"detalle_chain"];


    NSLog(@"CELL TAPPED");
    [self.navigationController pushViewController:detailViewController animated:YES];
}

I have been searching without success how to get the selected row object to pass it to the detail view controller.

Any help is welcome.

Answer 1

You can use an array to store your objects and update them in cellForRowAtIndexPath

For example: (I used dictionary here, because count of query results was undefined; Operation is subclass of PFObject)

class HistoryViewController: PFQueryTableViewController {
    var operations: [Int: Operation] = [:]

    override init!(style: UITableViewStyle, className: String!) {
        super.init(style: style, className: className)
    }

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        parseClassName = "Operation";
        textKey = "title";
        pullToRefreshEnabled = true;
        paginationEnabled = true;
        objectsPerPage = 25;
    }

    override func queryForTable() -> PFQuery! {
        var query = Operation.query()
        query.whereKey("wallet", equalTo: wallet)
        query.addDescendingOrder("date")
        return query
    }    

    override func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!, object: PFObject!) -> PFTableViewCell! {
        let operation = object as! Operation
        operations[indexPath.row] = operation
        var cell: PFTableViewCell = tableView.dequeueReusableCellWithIdentifier("cell") as! PFTableViewCell

        // set up your cell

        return cell
    }

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let row = tableView.indexPathForSelectedRow()!.row
        (segue.destinationViewController as! OperationInfoViewController).loadOperation(operations[row]!)
    }
}