IPhone : How to call index on UICollectionView using IBAction?

I am trying to put bunch of options on UICollectionView using IBAction as a trigger to open it each option, but I have difficulty what code should I call to trigger my action using IBAction. Here is my code:

@IBAction func openNewFilter(sender: AnyObject) {
    self.collectionView.dataSource = indexPath.section == 0
}
func numberOfSections() -> Int { 
return 2
}


func numberOfItemsInSection(_ section: Int) -> Int {
if section == 0 {
    return array.count
} else if section == 1 { 
    return 1
} else {
    return 0
}
}


func cellForItemAtIndexPath(_ indexPath: NSIndexPath) -> UICollectionViewCell?    {
if indexPath.section == 0 {
} else if indexPath.section == 1 {
}
}

I would appreciate it if you could help me, thanks