Parse check if user already tapped button - ios

Question

I am trying to implement a like feature in my app using parse. If a user taps the vote up button. The label increases changing the like number in parse side as well. However with my code a user can tap many times to increase the like. I would like to make it detect that user has tapped and make the like button disabled. To do that I have made a class in parse called "Liked". I made a username, imageId both a string column and a likeStatus as a Boolean . However I can't make is so that if a user likes any image it will add new item to it with userId, ImageId and likeStatus.
This is the Collection View code
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("newview", forIndexPath: indexPath) as! NewCollectionViewCell
let item = self.votes[indexPath.row]
// Display the country name
if let value = item["imageText"] as? String {
cell.postsLabel.text = value
}
// Display "initial" flag image
var initialThumbnail = UIImage(named: "question")
cell.postsImageView.image = initialThumbnail
cell.complition = {
self.likeButton(indexPath)
}
if let votesValue = item["votes"] as? Int
{
cell.votesLabel?.text = "\(votesValue)"
}
// Fetch final flag image - if it exists
if let value = item["imageFile"] as? PFFile {
cell.postsImageView.file = value
cell.postsImageView.loadInBackground({ (image: UIImage?, error: NSError?) -> Void in
if error != nil {
cell.postsImageView.image = image
}
})
}
return cell
}
/*
==========================================================================================
Segue methods
==========================================================================================
*/
func likeButton(indexPath:NSIndexPath)
{
let cell = self.collectionView.cellForItemAtIndexPath(indexPath) as! NewCollectionViewCell
let object = self.votes[indexPath.row]
if let likes = object["votes"] as? Int
{
object["votes"] = likes + 1
object.saveInBackgroundWithBlock{ (success:Bool,error:NSError?) -> Void in
println("Data saved")
}
cell.votesLabel?.text = "\(likes + 1)"
}
else
{
object["votes"] = 1
object.saveInBackgroundWithBlock{ (success:Bool,error:NSError?) -> Void in
println("Data saved")
}
cell.votesLabel?.text = "1"
}
}
and this is the cell code
#IBAction func vote(sender: AnyObject) {
if self.complition != nil
{
self.complition!()
}
}
}
Any tips or How am I able to do this in code?Thank you.

Answer 1

The way I did this was by using a class in Parse that I called "UserLikeActivity" or something to that effect, and in it, it had a column pointer to the user that did the liking, a pointer to the actitivy that was liked (in my case it was a post), a type (indicating whether it was an upvote, downvote, follow, etc), and a pointer to the user who created the activity that was liked.
Now, when I was querying Parse to set my tables up, not only did I query the class that contained all the posts, but I also queried this class, which I then saved and used to determine the button state. So for every cell, if the activity had already been liked, I disabled the button. Hopefully this will help you get going in the right direction since you've asked this question about 7 times.