How to cache the image in swift using SDWebImage? - swift

Question

I am fetching the image from firebase storage and want to cache it using SDWebImage, but in my ViewController it gets keep on downloaded. Please guide me how to cache the images
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! demoCell
cell.textDemo.text = images[indexPath.row]
var images_list = [String]()
images_list.append(images[indexPath.row])
images_list.append(images[indexPath.row] + "1")
let storage = Storage.storage().reference()
var imagesarray = [URL]()
for x in images_list{
let storageRef = storage.child("images/\(x).jpg")
storageRef.downloadURL { (url, error) in
if let error = error{
print(error.localizedDescription)
}
else if let downloadURL = url?.absoluteString{
cell.imageDemo.image = SDImageCache.shared().imageFromCache(forKey: downloadURL)
print("Image Cached")
}
else{
cell.imageDemo.sd_setImage(with: url!, completed: nil)
}
}
}
return cell
}

Answer 1

Rather than writing :
cell.imageDemo.image = SDImageCache.shared().imageFromCache(forKey: downloadURL)
Try this :
cell.imageDemo.sd_setImage(with: URL(string: downloadURL), placeholderImage: UIImage(named: "Your Default Image"))
SDWebImage will handle the caching part here.

Answer 2

This was my solution to the issue
var value : Any?
var vc = ViewController()
var images = [String]()
var downloads_array = [URL]()
override func viewDidLoad() {
super.viewDidLoad()
getImageNames()
downloadImages()
}
func downloadImages(){
let storage = Storage.storage().reference()
for x in images{
let storageRef = storage.child("images/\(x).jpg")
storageRef.downloadURL { (url, error) in
if let error = error{
print(error.localizedDescription)
}
else{
self.downloads_array.append(url!)
self.tableView.reloadData()
}
}
}
}
func getImageNames(){
images = vc.images
}
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return downloads_array.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! demoCell
cell.textDemo.text = images[indexPath.row]
if let downloadURL = SDImageCache.shared().imageFromCache(forKey: downloads_array[indexPath.row].absoluteString){
cell.imageDemo.image = downloadURL
}
else{
cell.imageDemo.sd_setImage(with: downloads_array[indexPath.row], completed: nil)
}
return cell
}