Scrollview vs Collectionview. Get "visible image" - ios

Question

What I want to achieve: I have an array of images that I want to horizontally swipe/scroll through. These images represent contacts. When I find the contact(image) I want, I press a separate Start Call button. This button segues to a Phone view controller. I need to display an image of the person I'm calling on that Phone view controller. To do this I need to know what contact image I was on before I initiated the segue.
My contacts view controller. Currently showing my scrollview attempt
What I currently have: I have a scrollview and a separate collectionview already set up (they are in NO WAY connected to each other. I have both because I'm trying to figure out which gets me what I need). Both are fully functional and allow me to page through images from my array.
I can’t figure out how to pragmatically get which image is being displayed when I press the button that would initiate the segue to the next view controller.
I was originally trying to tag the images and then retrieve the tag and pass it to the next view controller via segue.
I then tried to get the index of the image that is "currently visible" and pass it via segue.
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ImageCollectionViewCell", for: indexPath) as! ImageCollectionViewCell
cell.imgImage.image = imageArray[indexPath.row]
//Get character for segue
selectedCharacter = indexPath.row
return cell
}
I also tried to get the image name and pass that via segue.
func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ImageCollectionViewCell", for: indexPath) as! ImageCollectionViewCell
switch cell.imgImage.image{
case UIImage(named: "Van"):
selectedCharacter = 2
case UIImage(named: "Fel"):
selectedCharacter = 3
default:
selectedCharacter = 1
}
}
I have yet to be able to figure out any way to get info with the scrollview.
Scrollview viewDidLoad code:
#IBOutlet var scrollView: UIScrollView!
for i in 0..<images.count {
let imageView = UIImageView()
let x = self.view.frame.size.width * CGFloat(i)
imageView.frame = CGRect(x: x, y: 0, width: 343, height: 244)
imageView.contentMode = .scaleAspectFit
imageView.image = images[i]
imageView.tag = i
scrollView.contentSize.width = scrollView.frame.size.width * CGFloat(i + 1)
scrollView.addSubview(imageView)
}
The Question: Does anyone have any ideas on how I get which contact I'm trying to call and if I should use a scroll view or a collection view?
Thank you!

Answer 1

I don't know where you click, but you can get the current view index with this:
let index = scrollView.contentOffset.x / scrollView.bounds.size.width
collectionView or scrollview is the same

Answer 2

you can use a collection view. create a custom cell class that has an image property. when you are about to return the cell in the cellForItem function, you can set the image property.
let cell = collectionView.dequeueReusableCellWithIdentifier("Your Cell's identifier", forIndexPath: indexPath)
cell.image = imageArray[indexPath.item]
you can then override the didSelectItem, and access the image property of the cell at the indexPath that is passed in like so:
let cell = collectionView!.cellForItemAtIndexPath(indexPath)
let image = cell.image
// do whatever you need with the image.