dynamic image resizing after asynchronously downloading it from the firebase - ios

Question

I am trying to dynamically adjust the image size depending upon the image that I download from the firebase database and present it in the table view cell. I want the width of the image to be the frame width and the height to adjust accordingly.
I have a customImageView class to download image asynchronously from firebase
I've tried many methods but in vain. Is there a super clean way to adjust the image size dynamically :-D
this Is my cell :
class viewControllerHomeCell: UITableViewCell {
#IBOutlet var mainImage: CstmImageView!
}
my cell for row at :
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cellData = TableViewControllerHome.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! viewControllerHomeCell
cellData.mainImage.loadImagesWithUrl(from: self.postArray[indexPath.row].covrImgUrl)
}
and this is a UIImageView subclass to load images from the firebase async. :
class CstmImageView : UIImageView {
let imageCache = NSCache<AnyObject, AnyObject>()
var imageUrlString : String?
func loadImagesWithUrl(from imageUrl : String!) {
imageUrlString = imageUrl
self.image = nil
if let cachedImage = imageCache.object(forKey: imageUrl as AnyObject) as? UIImage {
self.image = cachedImage
return
}
let url = URLRequest(url: URL(string: imageUrl)!)
URLSession.shared.dataTask(with: url) { (data, response, eror) in
if eror != nil {
print(eror!)
return
}
DispatchQueue.main.async {
if let downloadedImage = UIImage(data : data!) {
if self.imageUrlString == imageUrl {
self.image = downloadedImage
}
self.imageCache.setObject(downloadedImage, forKey: imageUrl as AnyObject)
}
}
}.resume()
}
}
any help is appreciated a a lot : )

Answer 1

Take your imageView Height Outlet and connect with your imageView height constrain
class viewControllerHomeCell: UITableViewCell {
#IBOutlet var mainImage: UIImageView!
#IBOutlet var viewImageViewHeight: NSLayoutConstraint!
}
And Use Pod for Download Image
pod 'SDWebImage'
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cellData = TableViewControllerHome.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! viewControllerHomeCell
cellData.mainImage.sd_setImage(with:URL.init(string: "Pass Yor image Url string here"))
{ (image, error, imageCacheType, url) in
cellData.mainImage.image = image
viewImageViewHeight.constant = image?.size.height
}
cellData.mainImage.loadImagesWithUrl(from: self.postArray[indexPath.row].covrImgUrl)
}