How to load images dynamically inside UITextView - swift

Question

I have a UITextView and appending TextAttachments inside of it. I am getting photos from web url. Here is the code:
image.load(url: URL(string: ("http://www.furkan.webofisin.com/upload/media/5db1b96366cd8.jpg")))
imageAttachment.image = image.image
let image1String = NSAttributedString(attachment: imageAttachment)
fullString.append(image1String)
And this is the load function as extension:
var imageUrlString: String?
func load(urlString: String) {
imageUrlString = urlString
guard let url = URL(string: urlString) else {
DispatchQueue.main.async {
let urlMessage = "Hata"
appDelegate.errorView(message: urlMessage, color: smoothGreenColor)
}
return
}
image = nil
if let imageFromCache = imageCache.object(forKey: urlString as NSString) {
self.image = imageFromCache
return
}
URLSession.shared.dataTask(with: url) { (data , response, error) in
if error != nil {
DispatchQueue.main.async {
let urlMessage = "Bir hata meydana geldi."
appDelegate.errorView(message: urlMessage, color: smoothGreenColor)
}
return
}
DispatchQueue.main.async {
let imageToCache = UIImage(data: data!)
if self.imageUrlString == urlString {
self.image = imageToCache
}
imageCache.setObject(imageToCache ?? UIImage(named: "astast")!, forKey: urlString as NSString)
}
}.resume()
}
Images not displaying at first time after refresh page its displaying because of caching.
I checked image.image as UIImage but its always nil before loading finished.
Here is the screenshot of first opening.
At first opening image data is nil
How can I detect and reload images when image data filled.

Answer 1

Add a completion as call to get image initially is asynchronous unlike from local cache
func load(urlString: String,completion:#escaping(() -> () )) {
imageUrlString = urlString
guard let url = URL(string: urlString) else {
DispatchQueue.main.async {
let urlMessage = "Hata"
appDelegate.errorView(message: urlMessage, color: smoothGreenColor)
}
return
}
image = nil
if let imageFromCache = imageCache.object(forKey: urlString as NSString) {
self.image = imageFromCache
completion()
return
}
URLSession.shared.dataTask(with: url) { (data , response, error) in
if error != nil {
DispatchQueue.main.async {
let urlMessage = "Bir hata meydana geldi."
appDelegate.errorView(message: urlMessage, color: smoothGreenColor)
}
return
}
DispatchQueue.main.async {
let imageToCache = UIImage(data: data!)
if self.imageUrlString == urlString {
self.image = imageToCache
}
imageCache.setObject(imageToCache ?? UIImage(named: "astast")!, forKey: urlString as NSString)
completion()
}
}.resume()
}
Call
image.load(url: URL(string: ("http://www.furkan.webofisin.com/upload/media/5db1b96366cd8.jpg"))) {
imageAttachment.image = image.image
let image1String = NSAttributedString(attachment: imageAttachment)
fullString.append(image1String)
}