Why is my UICollectionView cell not clickable in my swift ios app?

Question

I'm using UICollectionView in my swift class, it's placed on my UIViewController. I connected the collectionView to the outlet in my code, I set up delegate and datasource and I see the outcome in my app. Everything works besides the fact that when I click each cell - nothing happens.

My code is as follows:

class UsersList: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {


@IBOutlet weak var tview: UICollectionView!

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)

    tview.backgroundColor = UIColor.whiteColor() //this works
    tview.delegate = self
    tview.dataSource = self
}

func collectionView(tview: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    print("You selected cell #\(indexPath.item)!")
    //this does not appear in the console :(
}

Is there anything else I could do to see the print msg in the console?

Lambkin

Answer 1

In swift, the parameter name and function name identify a function together. UICollectionViewDelegate have function

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

but not

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

Fey

I tried that but it didn't help, I'm still not able to display any message while clicking cells... I thought it might be caused by the fact that I didn't put the override word before the func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) but then when I did that I got a message that Method does not override any method from its superclass... Is there anything else I might miss? – Lambkin

UICollectionViewDelegate is a protocol, there is no need to add override keywords. You can check the uicollectionView's allowsSelection , it should be true. – Fey

Answer 2

Try removing all of your UIGestures from the view then test to see if the UICollectionView Cells are able to be interacted with normally.

In my case, I had to remove the lines:

let tap = UITapGestureRecognizer(target: self, action: #selector(dismissKeyboard))
    self.view.addGestureRecognizer(tap)

For some reason this was getting in the way of being able to click on my cells.

Defoe

Answer 3

For me, I had to set the UICollectionView's delegate. For example, in viewDidLoad():

collectionView.delegate = self

This is necessary or the delegate methods will not be called!

Orphaorphan

Hi Chloe! Can you please add an explanation as to why that was the solution? Welcome to SO! – Meteoroid

Answer 4

Do make sure the user interaction is enabled in storyboard

Concurrence

It is enabled, so it must be something else :( – Lambkin

another possible issue is you set the tview.delegate = self, tview.dataSource = self in viewWillAppear, please do this in viewdidload! Hope it help – Concurrence

Answer 5

I had to change scroll direction from vertical to horizontal in storyboard and it worked for me.

Randeerandel

Answer 6

My problem was that isUserInteractionEnabled was false for the parent view of the collectionView. I had taken the code for the parent view from somewhere else where evidently that had been the right thing to do. But not here... Sigh...

Gault