Save Updated Order Of CollectionView Images To UserDefaults - Swift - swift

Question

I have a collectionview which loads images and displays them. I have implemented gestures so that a person can hold and reorder the images, however the order does not save. Is there a way to save this order through User Defaults? If so, where would I implement this to save the order and load again? Below is my code for collectionView. Thanks in advance, any help is much appreciated!
func collectionView(_ imageCollection: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return self.posts.count
}
func collectionView(_ imageCollection: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = imageCollection.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! ImageCollectionViewCell
let post = self.posts[indexPath.item]
cell.imageView.sd_setImage(with: URL(string: post.imageURL))
return cell
}
func collectionView(_ imageCollection: UICollectionView, didSelectItemAt indexPath: IndexPath) {
switch mMode {
case .view:
imageCollection.deselectItem(at: indexPath, animated: true)
case .select:
dictionarySelectedIndexPath[indexPath] = true
}
}
func collectionView(_ imageCollection: UICollectionView, didDeselectItemAt indexPath: IndexPath) {
if mMode == .select {
dictionarySelectedIndexPath[indexPath] = false
}
}
func collectionView(_ collectionView: UICollectionView, canMoveItemAt indexPath: IndexPath) -> Bool {
return true
}
func collectionView(_ collectionView: UICollectionView, moveItemAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
let item = posts.remove(at: sourceIndexPath.row)
posts.insert(item, at: destinationIndexPath.row)
}

Answer 1

Base on your example code, I think it looks fine just missing to reload. :)
func collectionView(_ collectionView: UICollectionView, moveItemAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
let item = posts.remove(at: sourceIndexPath.row)
posts.insert(item, at: destinationIndexPath.row)
collectionView.reloadData() //the missing code
}