Select and Pass Multiple Images in an Api request Swift - image

Question

Im new to swift and im trying to figure out a way to select multiple images and pass them as array in a API request.I tried to use DKImagePickerController, in which im able to select multiple images and even preview them but i have no idea how to pass them to an api as an array.
The code is as follows:
import UIKit
class CameraTabViewController: UIViewController,UICollectionViewDataSource, UICollectionViewDelegate{
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func saveCamBtn(_ sender: Any) {
let parent = self.parent as! DiaryEntryViewController
parent.CameraView.isHidden = true
}
#IBAction func selectPhotoBtn(_ sender: Any) {
let pickerController = DKImagePickerController()
pickerController.defaultSelectedAssets = self.assets
pickerController.didCancel = { ()
}
pickerController.didSelectAssets = { [unowned self] (assets: [DKAsset]) in
self.updateAssets(assets: assets)
}
self.present(pickerController, animated: true)
}
var pickerController: DKImagePickerController!
var assets: [DKAsset]?
#IBOutlet var previewView: UICollectionView!
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int{
return self.assets?.count ?? 0
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let asset = self.assets![indexPath.row]
var cell: UICollectionViewCell?
var imageView: UIImageView?
if asset.isVideo {
cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CellVideo", for: indexPath)
imageView = cell?.contentView.viewWithTag(1) as? UIImageView
} else {
cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CellImage", for: indexPath)
imageView = cell?.contentView.viewWithTag(1) as? UIImageView
}
if let cell = cell, let imageView = imageView {
let layout = collectionView.collectionViewLayout as! UICollectionViewFlowLayout
let tag = indexPath.row + 1
cell.tag = tag
asset.fetchImageWithSize(layout.itemSize.toPixel(), completeBlock: { image, info in
if cell.tag == tag {
imageView.image = image
}
})
}
return cell!
}
func updateAssets(assets: [DKAsset]) {
self.assets = assets
self.previewView?.reloadData()
}
}