CODEWITHSUNDEEP
iosswiftuicollectionview
Jacobo Koenig
Jacobo Koenig

Reputation: 12514

Strange Cell reaction on UICollectionView

I am having a very peculiar problem with a VC that contains a UICollectionView in it. I am trying to have cells that have been previously selected by the user, 1) Reduce its alpha, and 2) Unhide an icon at the top left of the cell. My collection loads twice. Once with the data source previously stored in the device, and then once fresh data is loaded from an API.

What I find is that at first the view loads correctly, but then, strangely, the alpha color is correct in every cell, but some cells unhide the icon on the second load!

I have no idea what could be causing this. Any help?

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath)

    if defaults.boolForKey("gotPL") {

        let catNumber = cell.viewWithTag(1) as! UILabel
        let catTitle = cell.viewWithTag(2) as! UILabel

        catNumber.text = String(indexPath.item + 1)
        catTitle.text = defaults.arrayForKey("playlistTitles")![indexPath.item] as? String

        cell.layer.cornerRadius = 30

//CUSTOM LOAD FUNCTIONALITY STARTS HERE
        if defaults.arrayForKey("selectedArray") != nil {
            let selectedArray: [String] = defaults.arrayForKey("selectedArray") as! [String]
            if selectedArray.contains(defaults.arrayForKey("playlistTitles")![indexPath.item] as! String) {
                print(indexPath.item)
                cell.alpha = 0.5 //WORKS CORRECTLY
                cell.viewWithTag(3)?.hidden = false //IS REPLICATED INCORRECTLY ON SECOND LOAD
            }
        }

        return cell
    }

    return cell
}

First Load Second Load

Upvotes: 0

Views: 89

Answers (1)

kai
kai

Reputation: 330

You need refresh value of cell.alpha and cell.alpha for every cell rather than if condition cell condition. The reason is cell reuse. 

    cell.alpha = 1 
    cell.viewWithTag(3)?.hidden = true
    if defaults.arrayForKey("selectedArray") != nil {
                let selectedArray: [String] = defaults.arrayForKey("selectedArray") as! [String]
                if selectedArray.contains(defaults.arrayForKey("playlistTitles")![indexPath.item] as! String) {
                    print(indexPath.item)
                    cell.alpha = 0.5 //WORKS CORRECTLY
                    cell.viewWithTag(3)?.hidden = false //IS REPLICATED INCORRECTLY ON SECOND LOAD
                }
            }

good luck!

Upvotes: 2

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