Image not getting Proper height inside UITableViewCell ios Swift 4 - uitableview

Question

I am trying to download image from server and want to load images inside my cell but as i am downloading inside cellForRowAt method it wont get height for the first time. If i scroll up and scroll down again the image will have proper height.
Using Kingfisher to download images from server
var homeList = [NSDictionary]()
var rowHeights : [Int:CGFloat] = [:]
func numberOfSections(in tableView: UITableView) -> Int
{
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return homeList.count
}
func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
return 100
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
if let height = self.rowHeights[indexPath.row]{
print(" Height \(height)")
return height
}
else{
return 160
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if let homeObject = homeList[safe: indexPath.row] {
if let dynamicURL = homeObject["dynamic_card_url"] as? String, dynamicURL != "" {
tableView.register(UINib(nibName: "DynamicCell", bundle: nil), forCellReuseIdentifier: "\(indexPath.row)")
let cell = tableView.dequeueReusableCell(withIdentifier: "\(indexPath.row)", for: indexPath) as! DynamicCell
KingfisherManager.shared.downloader.downloadImage(with: URL(string: dynamicURL)!, options: .none, progressBlock: nil, completionHandler: { (image, error, url, data) in
DispatchQueue.main.async {
if (image != nil || url != nil){
let aspectRatio = (image! as UIImage).size.height/(image! as UIImage).size.width
cell.dynamicImageView.image = image
let imageHeight = self.view.frame.width*aspectRatio
self.rowHeights[indexPath.row] = imageHeight
}else{
print("Image or URL is nil")
}
}
})
cell.selectionStyle = .none
cell.backgroundColor = UIColor.clear
return cell
}
}
}

Answer 1

When you downloaded your image you should reload your cell to change it size to appropriate one. You get right sizes as you scrolling because tableView calls heightForRowAt when it needs to display new cell. So inside in DispatchQueue.main.async { reload the cell after setting all necessary properties UITableView().reloadRows(at: [IndexPath], with: UITableViewRowAnimation.automatic)

Answer 2

I used this guys suggestion: https://stackoverflow.com/a/33499766/8903213
code:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
cell.imageView?.kf.setImage(with: URL(string: urlOfPhoto)!, placeholder: PlaceholderImages.user, completionHandler: {
(image, error, cacheType, imageUrl) in
cell.layoutSubviews()
})
...
and this seems to be working for me.