UICollectionView - random cells are selected

Question

I have a Horizontal UICollectionView like the horizontal Calender in iOS. Paging is enabled but not allowsMultipleSelection.

self.allowsMultipleSelection = fals         


        

Answer 1

Take a class-level variable, say index

var index = -1

As you have said that multiple selections are not allowed so the following will do the job for you

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    index = indexPath.item
    collectionView.reloadData()
}

func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) {
    let cell = collectionView.cellForItem(at: indexPath)
    if let cell = cell {
        cell.backgroundColor = indexPath.item == index ? .red :  .white
    }
}

Whenever user tap on any cell we save the position in index variable and then call the reloadData() to notify collectionView about the change In cellForRowAt we check if the current cell us selected we set the color to red otherwise white