UICollectionView current visible cell index

Question

I am using UICollectionView first time in my iPad application. I have set UICollectionView such that its size and cell size is same, means only onc

Answer 1

UICollectionView current visible cell index: Swift 3, 4 and 5+

var visibleCurrentCellIndexPath: IndexPath? {
    for cell in self.collectionView.visibleCells {
        let indexPath = self.collectionView.indexPath(for: cell)
        return indexPath
     }
        
     return nil
}

As an Extension:

extension UICollectionView {
  var visibleCurrentCellIndexPath: IndexPath? {
    for cell in self.visibleCells {
      let indexPath = self.indexPath(for: cell)
      return indexPath
    }
    
    return nil
  }
}

Usage:

if let indexPath = collectionView.visibleCurrentCellIndexPath { 
   /// do something
}