CODEWITHSUNDEEP
iosswiftuicollectionview
Gugulethu
Gugulethu

Reputation: 1436

Failure to select an item in a Collection View, Swift

I have been working working with collectionViews and TableViews to understand how they work but this is a little confusing. I have a collection view hooked up to a ViewController together with the delegate and datasource set to itself. But on trying to use the didSelectItemAtIndexPath, nothing happens. The collection is displayed perfectly too so the datasource functions are working well.

This is my code: 

@IBOutlet weak var timeCollectionView: UICollectionView!

 override func viewDidLoad() {
        super.viewDidLoad()

        //Register the Cell
        let nib = UINib(nibName: "DurationSelectionCollectionViewCell", bundle:nil)
        self.timeCollectionView.registerNib(nib, forCellWithReuseIdentifier: "DurationSelectionCollectionViewCell")

        timeCollectionView.delegate = self
        timeCollectionView.dataSource = self

        ....

}

//Selecting an item and highlighting it. 
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {

        timeCollectionView.cellForItemAtIndexPath(indexPath)?.backgroundColor = UIColor.grayColor()

}

Upvotes: 1

Views: 1639

Answers (3)

user3353890
user3353890

Reputation: 1891

I tested this and it worked as long as your collectionview delegate and datasource are connected. Your problem is that you call timeCollectionView, where you want to call the generic collectionView variable that's given to you in the didSelectItemAtIndexPath declaration. I highlighted it in bold below:

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath)

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {

    let cell = collectionView.cellForItemAtIndexPath(indexPath) as! MyCustomCollectionViewCell
    cell.backgroundColor = UIColor.grayColor()

}

Upvotes: 1

Stephenye
Stephenye

Reputation: 814

If didSelectItemAtIndexPathItem: doesn't get invoked, make sure you have delegate and dataSource set properly to your view controller.

Upvotes: 1

haik.ampardjian
haik.ampardjian

Reputation: 864

If you want to change the background color on selecting the item in collection view, you should subclass your UICollectionViewCell and override highlighted property.

class DurationSelectionCollectionViewCell: UICollectionViewCell {
    override var highlighted: Bool {
        didSet {
            contentView.backgroundColor = highlighted ? .grayColor() : nil
        }
    }
}

Upvotes: 0

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