UITableview prototype cell not populating properly - ios

Question

I am trying to populate a UITableView prototype cell with "Facebook status". It has images and videos depending on the response from Facebook server. But I am not able to populate it properly.
I will get the first image from the array. But when I scroll down UITableView and reach the top again, the image disappears. And when I print the value of i it exceeds the count of array soon after the tableview is loaded.
I am adding the edited code here.
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
var rows : Int = 0
if section < numberOfRowsAtSection.count{
rows = numberOfRowsAtSection[section]
print(section,rows)
}
return rows
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
print("Section,Row",indexPath.section, indexPath.row)
switch(combinedArray[indexPath.section][indexPath.row]){
case "photo" :
let cell = tableView.dequeueReusableCell(withIdentifier: "ImageDetail", for:indexPath) as! imageCell
if(im < imageDetails.count){
let imageUrl = imageDetails[im]
let url = URL(string:imageUrl)
let data = try? Data(contentsOf: url!)
cell.storyDetailsLbl1.text = photoStoryDetails[im]
print(imageDetails[im])
cell.images1.image = UIImage(data: data!)
}
im = im + 1
return cell
case "video" :
let cell1 = tableView.dequeueReusableCell(withIdentifier: "VideoCell", for: indexPath) as! videoPlayerCell
cell1.videoView.isHidden = false
if vd < videoURLs.count{
print(videoURLs.count)
let urls = videoURLs[vd]
cell1.videoPlayerItem = AVPlayerItem.init(url: urls)
cell1.videoLabel.text = videoStoryDetails[vd]
}
vd = vd + 1
return cell1
case "link":
let cell2 = tableView.dequeueReusableCell(withIdentifier: "LinkCell", for: indexPath) as! linkCell
if ln < linkDetails.count {
cell2.linkLbl.text = linkDetails[ln]
}
ln = ln + 1
return cell2
default:
let cell3 = tableView.dequeueReusableCell(withIdentifier: "StatusCell", for: indexPath) as! statusCell
if st < statusDetails.count{
cell3.statusLbl.text = statusDetails[st]
}
st = st + 1
return cell3
}
}

Answer 1

Tableviews deque already created cells and reuse them to enhance performance. So a cell with the identifier "ImageDetail" could be reused and populated with data from any of your case statements. This will cause oddities like images disappearing when they shouldn't.
One way to solve this is to ensure you are handling each cell property in every case. cell.storyDetailsLbl1.text isn't handled in the photo case. cell.images1.image isn't handled in the link case, etc.
Better would be to define a cell with a unique identifier for each one of your cases. i.e. PhotoCell, LinkCell, VideoCell, etc.