collectionView_selection_3.swift

override var isSelected: Bool{
  didSet{
    if self.isSelected
    {
      //This block will be executed whenever the cell’s selection state is set to true (i.e For the selected cell)
    }
    else
    {
      //This block will be executed whenever the cell’s selection state is set to false (i.e For the rest of the cells)
    }
  }
}