Custom UItableViewCell not loading Image? Swift 4 - ios

Question

I'm new at Xcode and swift and ran into this bug. I've searched around a bit and could not find anything on this topic. I have an extension for UIImage that allows me to cache images to the phone here :
import UIKit
let imageCache = NSCache<AnyObject, AnyObject>()
extension UIImageView{
func loadImageUsingCacheWithUrlString(urlString : String)
{
self.image = nil;
// check cache for image first
if let cachedImage = imageCache.object(forKey: urlString as AnyObject) as? UIImage {
self.image = cachedImage;
return
}
let url = URL(string: urlString)
URLSession.shared.dataTask(with: url!, completionHandler: { (data, response, error) in
//download hit an error
if error != nil {
print(error!)
return
}
DispatchQueue.main.async {
if let downloadedImage = UIImage(data: data!){
imageCache.setObject(downloadedImage, forKey: urlString as AnyObject)
self.image = downloadedImage
}
}
}).resume()
}
}
It is not loading the image into a table views image view:( Ignore random text )
Table view not loading image
Here is also the UItableView from the main.storyboard:
Updated main.storyboard screen shot
Here is my cellForRowAt: indexPath method where the image is suppose to be loaded:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cellid" , for: indexPath) as! CustomChatTableViewCell;
let gray = UIColor(red:0.94, green:0.94, blue:0.94, alpha:1.0)
let red = UIColor(red:1.00, green:0.22, blue:0.37, alpha:1.0)
let message = messages[indexPath.item]
if message.toId == user?.toId{
cell.messageBackground.backgroundColor = red
cell.messageLabel.textColor = UIColor.white
}
else{
cell.messageBackground.backgroundColor = gray
cell.messageLabel.textColor = UIColor.black
}
cell.messageLabel.text = message.text
if let imageUrl = message.imageUrl{
print(imageUrl)
cell.messageImage.loadImageUsingCacheWithUrlString(urlString: imageUrl)
cell.messageImage.isHidden = false;
cell.messageLabel.isHidden = true
//cell.messageBackground.isHidden = true;
}
else
{
cell.messageImage.isHidden = true;
cell.messageLabel.isHidden = false
cell.messageBackground.isHidden = false;
}
return cell;
}
Expected Result:
Images load into cells
Observed Result
Images dont load into the cells :(
these lines of code :
if let imageUrl = message.imageUrl{
print(imageUrl)
cell.messageImage.loadImageUsingCacheWithUrlString(urlString: imageUrl)
Actually print a valid URL string for an image on my firebase database, which is confusing because It is not loading the image.
Important
I use the loadImageUsingCacheWithUrlString method in other parts of my project and it works fine so I don't think its the method.... whats going on?? thank you so much if you can solve this you are an amazing coder!!
I can put an image in the main.storyboard and it works... so I dont know what could be going wrong... :(
screen shot of updated main.storyboard
Image seems to be fine in Extension :
code with breakpoint and console showing
Not sure If the image Is being covered Up in Capture View Hierarchy :
View Hierarchy

Answer 1

In your storyboard, the imageView messageImage is a subview of the view messageBackground. In your if-statement in cellForRow method, you are setting the messageBackground to be hidden
if let imageUrl = message.imageUrl{
print(imageUrl)
cell.messageImage.loadImageUsingCacheWithUrlString(urlString: imageUrl)
cell.messageImage.isHidden = false;
cell.messageLabel.isHidden = true
cell.messageBackground.isHidden = true; //THIS IS THE CULPRIT
}
Since messageBackground is hidden, it's subviews are hidden as well. Might need to rethink your business logic here.