Loading Downloading image from URL on Swift

Question

I d like to load an image from a URL in my application  so I first tried with Objective-C and it worked  however  with Swift  I ve a compilation error        imageWithData  is unavailable  use object construction  UIImage data      My function     IBOutlet var imageView   UIImageView  override func viewDidLoad         super viewDidLoad        var url NSURL   NSURL URLWithString  http   myURL ios8 png       var data NSData   NSData dataWithContentsOfURL url  options  nil  error  nil       imageView image   UIImage imageWithData data    Error here     In Objective-C    -  void viewDidLoad        super viewDidLoad        NSURL  url    NSURL URLWithString    http   myURL ios8 png         NSData  data    NSData dataWithContentsOfURL url         imageView image    UIImage imageWithData  data        labelURL text     http   www quentinroussat fr assets img iOS 20icon s 20Style ios8 png        Can someone please explain me why the imageWithData  doesn t work with Swift  and how can I solve the problem

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Swift 2 0     1   if let url   NSURL string   http   etc            if let data   NSData contentsOfURL  url            imageURL image   UIImage data  data                    OR   imageURL image       NSURL string   http    image name           flatMap   NSData contentsOfURL   0         flatMap   UIImage data   0      2  Add this method to VC or Extension   func load image urlString String      let imgURL  NSURL   NSURL string  urlString       let request  NSURLRequest   NSURLRequest URL  imgURL       NSURLConnection sendAsynchronousRequest request  queue  NSOperationQueue mainQueue       response  NSURLResponse   data  NSData   error  NSError   in          if error    nil               self image element image   UIImage data  data                      Usage    self load image   url strig here

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class ImageStore  NSObject        static let imageCache   NSCache lt NSString  UIImage gt       extension UIImageView       func url   url  String             DispatchQueue global   async    weak self  in             guard let stringURL   url  let url   URL string  stringURL  else                   return                           func setImage image UIImage                     DispatchQueue main async                       self  image   image                                             let urlToString   url absoluteString as NSString             if let cachedImage   ImageStore imageCache object forKey  urlToString                    setImage image  cachedImage                else if let data   try  Data contentsOf  url   let image   UIImage data  data                    DispatchQueue main async                       ImageStore imageCache setObject image  forKey  urlToString                      setImage image  image                                 else                   setImage image  nil                                   Usage   let imageView   UIImageView   imageView url  quot image url quot

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Swift 4 1 I have crated a function just pass image url  cache key after image is generated set it to completion block      class NetworkManager  NSObject      private var imageQueue   OperationQueue     private var imageCache   NSCache lt AnyObject  AnyObject gt       func downloadImageWithUrl imageUrl  String  cacheKey  String  completionBlock   escaping    image  UIImage  - gt  Void         let downloadedImage   imageCache object forKey  cacheKey as AnyObject      if let      downloadedImage as  UIImage         completionBlock downloadedImage as  UIImage        else         let blockOperation   BlockOperation         blockOperation addExecutionBlock           let url   URL string  imageUrl          do             let data   try Data contentsOf  url             let newImage   UIImage data  data            if newImage    nil               self imageCache setObject newImage   forKey  cacheKey as AnyObject              self runOnMainThread                 completionBlock newImage                            else               completionBlock nil                        catch             completionBlock nil                           self imageQueue addOperation blockOperation        blockOperation completionBlock             print  Image downloaded   cacheKey                        extension NetworkManager     fileprivate func runOnMainThread block  escaping   - gt Void        if Thread isMainThread         block         else         let mainQueue   OperationQueue main       mainQueue addOperation           block

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The only things there is missing is a    let url   NSURL URLWithString  http   live-wallpaper net iphone img app i p iphone-4s-wallpapers-mobile-backgrounds-dark 2466f886de3472ef1fa968033f1da3e1 raw 1087fae1932cec8837695934b7eb1250 raw jpg    var err  NSError  var imageData  NSData   NSData dataWithContentsOfURL url  options  NSDataReadingOptions DataReadingMappedIfSafe  error   amp err  var bgImage   UIImage data imageData

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FYI   For swift-2 0 Xcode7 0 beta2  extension UIImageView       public func imageFromUrl urlString  String            if let url   NSURL string  urlString                let request   NSURLRequest URL  url              NSURLConnection sendAsynchronousRequest request  queue  NSOperationQueue mainQueue                   response  NSURLResponse   data  NSData   error  NSError   - gt  Void in                 self image   UIImage data  data

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If you just want to load image  Asynchronously   - just add this small extension to your swift code   extension UIImageView       public func imageFromUrl urlString  String            if let url   NSURL string  urlString                let request   NSURLRequest URL  url              NSURLConnection sendAsynchronousRequest request  queue  NSOperationQueue mainQueue                       response  NSURLResponse   data  NSData   error  NSError   - gt  Void in                 if let imageData   data as NSData                        self image   UIImage data  imageData                                                      And use it this way   myImageView imageFromUrl  https   robohash org 123 png

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Kingfisher is one of the best library for load image into URL    Github URL - https   github com onevcat Kingfisher     If you want to use Activity Indicator  imageview pic kf indicatorType    activity imageview pic kf setImage with  URL string   Give your url string        If you want to use custom placeholder image  imageview pic kf setImage with  URL string   Give your url string    placeholder  UIImage named   placeholder image name    options  nil  progressBlock  nil  completionHandler  nil

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Swift 4 update  To answer the original question directly  here s the swift equivalent of the posted Objective-C snippet   let url   URL string  image url  let data   try  Data contentsOf  url     make sure your image in this url does exist  otherwise unwrap in a if let check   try-catch imageView image   UIImage data  data       DISCLAIMER   It s important to note that the Data contentsOf   method will download the contents of the url synchronously in the same thread the code is being executed  so do not invoke this in the main thread of your application   An easy way to make the same code run asynchronously  not blocking the UI  is by using GCD   let url   URL string  image url   DispatchQueue global   async       let data   try  Data contentsOf  url     make sure your image in this url does exist  otherwise unwrap in a if let check   try-catch     DispatchQueue main async           imageView image   UIImage data  data             That said  in real life applications  if you want to have the best User Experience and avoid multiple downloads of the same image  you may want to also have them not only downloaded  but cached  There s already quite a few libraries that does that very seamless and they are all really easy to use  I personally recommend Kingfisher   import Kingfisher  let url   URL string   url of your image      this downloads the image asynchronously if it s not cached yet imageView kf setImage with  url     And that s it

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swift 5   extension UIImageView       func load url  URL            DispatchQueue global   async    weak self  in             if let data   try  Data contentsOf  url                    if let image   UIImage data  data                        DispatchQueue main async                           self  image   image                                                                           for using   override func awakeFromNib         super awakeFromNib       imgView load url    lt imageURLHere gt

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Swift 2 with error Handle and custom request header  Simply add extension to UIImageView    extension UIImageView       public func imageFromUrl urlString  String            if let url   NSURL string  urlString                let request   NSMutableURLRequest URL  url              request setValue   lt YOUR HEADER VALUE gt    forHTTPHeaderField    lt YOUR HEADER KEY gt                NSURLSession sharedSession   dataTaskWithRequest request                     data  response  error  in                 guard let data   data where error    nil else                      NSLog  Image download error    error                        return                                    if let httpResponse   response as  NSHTTPURLResponse                      if httpResponse statusCode  gt  400                           let errorMsg   NSString data  data  encoding  NSUTF8StringEncoding                          NSLog  Image download error  statusCode    httpResponse statusCode   error    errorMsg                             return                                                      dispatch async dispatch get main queue                      NSLog  Image download success                   self image   UIImage data  data                               resume                       And then  use the new imageFromUrl urlString  String  to download image  Usage   imageView imageFromUrl  https   i imgur com ONaprQV png

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A method for getting the image that is safe and works with Swift 2 0 and X-Code 7 1   static func imageForImageURLString imageURLString  String  completion   image  UIImage   success  Bool  - gt  Void        guard let url   NSURL string  imageURLString           let data   NSData contentsOfURL  url           let image   UIImage data  data          else                completion image  nil  success  false                return                completion image  image  success  true      You would then call this method like so    imageForImageURLString imageString     image  success  - gt  Void in         if success               guard let image   image                   else   return      Error handling here                 You now have the image              else                  Error handling here                    If you are updating the view with the image  you will have to use this after the  if success          dispatch async dispatch get main queue         - gt  Void in          guard let image   image                else   return      Error handling here              You now have the image  Use the image to update the view or anything UI related here             Reload the view  so the image appears         The reason this last part is needed if you are using the image in the UI is because network calls take time  If you try to update the UI using the image without calling dispatch async like above  the computer will look for the image while the image is still being fetched  find that there is no image  yet   and move on as if there was no image found  Putting your code inside of a dispatch async completion closure says to the computer   Go  get this image and when you are done  then complete this code   That way  you will have the image when the code is called and things will work well

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If you are looking for a very very simple implementation   This worked for me in Swift 2    let imageURL   NSURL string   https   farm2 staticflickr com 1591 26078338233 d1466b7da2 m jpg    let imagedData   NSData contentsOfURL  imageURL     imageView  image   UIImage data  imagedData    I implemented within a tableview with a custom cell that has only a image  func tableView tableView  UITableView  cellForRowAtIndexPath indexPath  NSIndexPath  - gt  UITableViewCell           let cell   tableView dequeueReusableCellWithIdentifier  theCell   forIndexPath  indexPath  as  customTableViewCell          let imageURL   NSURL string   https   farm2 staticflickr com 1591 26078338233 d1466b7da2 m jpg            let imagedData   NSData contentsOfURL  imageURL             cell imageView  image   UIImage data  imagedData           return cell

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Here is Working code for Loading   Downloading image from URL  NSCache automatically and Display Placeholder image before download and Load Actual image  Swift 4   Swift 5 Code   func NKPlaceholderImage image UIImage   imageView UIImageView  imgUrl String compate  escaping  UIImage   - gt  Void            if image    nil  amp  amp  imageView    nil           imageView  image   image                 var urlcatch   imgUrl replacingOccurrences of   quot   quot   with   quot   quot       let documentpath   NSSearchPathForDirectoriesInDomains  documentDirectory   userDomainMask  true  0      urlcatch   documentpath    quot   quot     quot   urlcatch  quot           let image   UIImage contentsOfFile urlcatch      if image    nil  amp  amp  imageView    nil               imageView  image   image          compate image                else                   if let url   URL string  imgUrl                            DispatchQueue global qos   background  async                      - gt  Void in                 let imgdata   NSData contentsOf  url                  DispatchQueue main async                          - gt  Void in                     imgdata  write toFile  urlcatch  atomically  true                      let image   UIImage contentsOfFile urlcatch                      compate image                      if image    nil                            if imageView    nil                                imageView  image   image                                                                                                     Use Like this      Here imgPicture   your imageView    UIImage named   quot placeholder quot   is Display image brfore download and load actual image    NKPlaceholderImage image  UIImage named   quot placeholder quot    imageView  imgPicture  imgUrl   quot Put Here your server image Url Sting quot      image  in

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let url   NSURL URLWithString  http   live-wallpaper net iphone img app i p iphone-4s-wallpapers-mobile-backgrounds-dark 2466f886de3472ef1fa968033f1da3e1 raw 1087fae1932cec8837695934b7eb1250 raw jpg    var err  NSError  var imageData  NSData   NSData dataWithContentsOfURL url options  NSDataReadingOptions DataReadingMappedIfSafe  error   amp err  var bgImage   UIImage data imageData

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Use this code in Swift  imageView image UIImage data  NSData contentsOfURL  NSURL string   http   myURL ios8 png

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class func downloadImageFromUrl with urlStr  String  andCompletionHandler  escaping    result Bool  - gt  Void            guard let url   URL string  urlStr  else               andCompletionHandler false              return                   DispatchQueue global qos   background  async               URLSession shared dataTask with  url  completionHandler     data  response  error  - gt  Void in                 if error    nil                       let httpURLResponse   response as  HTTPURLResponse                     Utils print   status code ID     String describing  httpURLResponse  statusCode                         if httpURLResponse  statusCode    200                           if let data   data                               if let image   UIImage data  data                                    ImageCaching sharedInterface   setImage image  withID  url absoluteString as NSString                                  DispatchQueue main async                                       andCompletionHandler true                                                                 else                                   andCompletionHandler false                                                         else                               andCompletionHandler false                                                 else                           andCompletionHandler false                                         else                       andCompletionHandler false                                   resume                     I have created a simple class function in my Utils swift class for calling that method you can simply accesss by classname methodname and your images are saved in NSCache using ImageCaching swift class  Utils downloadImageFromUrl with  URL  andCompletionHandler     isDownloaded  in                             if isDownloaded                                   if  let image   ImageCaching sharedInterface   getImage URL as NSString                                        self btnTeam setBackgroundImage image  for   normal                                                                 else                                   DispatchQueue main async                                       self btnTeam setBackgroundImage  imageLiteral resourceName   com    for   normal                                                                                               Happy Codding  Cheers

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Swift 2 2    Xcode 7 3     I got Amazing results   with AlamofireImage swift library   It provides multiple features like    Asynchronously download Auto Purging Image Cache if memory warnings happen for the app Image URL caching Image Caching Avoid Duplicate Downloads   and very easy to implement for your app  Step 1 Install pods    Alamofire 3 3 x     pod  Alamofire    AlamofireImage 2 4 x     pod  AlamofireImage    Step 2 import and Use  import Alamofire import AlamofireImage  let downloadURL   NSURL string   http   cdn sstatic net Sites stackoverflow company Img photos big 6 jpg v f4b7c5fee820    imageView af setImageWithURL downloadURL    that s it   it will take care everything    Great thanks to Alamofire guys  for making iDevelopers life easy

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Swift 4 2 and AlamofireImage  If using a library is not an issue  you can do it by help of the AlamofireImage  my samples are from its Github  Placeholder Images Example   let imageView   UIImageView frame  frame  let url   URL string   https   httpbin org image png    let placeholderImage   UIImage named   placeholder    imageView af setImage withURL  url  placeholderImage  placeholderImage    it has many handy functions and extension to work with images  from caching to scaling and resizing or even applying filters on the image  if images are important in your app  I suggest to use this framework and save your time

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For Swift-3 and above   extension UIImageView     public func imageFromUrl urlString  String        if let url   URL string  urlString            let request   URLRequest url  url          NSURLConnection sendAsynchronousRequest request as URLRequest  queue   main  completionHandler     response  data  error  in             if let imageData   data as NSData                    self image   UIImage data  imageData as Data

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Swift 4    This will shows loader while loading the image  You can use NSCache which store image temporarily   let imageCache   NSCache lt NSString  UIImage gt    extension UIImageView       func loadImageUsingCache withUrl urlString   String            let url   URL string  urlString          if url    nil  return          self image   nil             check cached image         if let cachedImage   imageCache object forKey  urlString as NSString                 self image   cachedImage             return                    let activityIndicator  UIActivityIndicatorView   UIActivityIndicatorView init activityIndicatorStyle   gray          addSubview activityIndicator          activityIndicator startAnimating           activityIndicator center   self center             if not  download image from url         URLSession shared dataTask with  url   completionHandler     data  response  error  in             if error    nil                   print error                   return                            DispatchQueue main async                   if let image   UIImage data  data                         imageCache setObject image  forKey  urlString as NSString                      self image   image                     activityIndicator removeFromSuperview                                               resume             Usage -  truckImageView loadImageUsingCache withUrl  currentTruck logoString

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You   ll want to do   UIImage data  data    In Swift  they   ve replaced most Objective C factory methods with regular constructors   See   https   developer apple com library prerelease ios documentation Swift Conceptual BuildingCocoaApps InteractingWithObjective-CAPIs html   apple ref doc uid TP40014216-CH4-XID 26

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Image loading from server  -  func downloadImage from url  URL   success  escaping    image UIImage - gt     failure  escaping     msg String - gt           print  Download Started       getData from  url    data  response  error in         guard let data   data  error    nil else               failure  Image cant download from G  or fb server               return                    print response  suggestedFilename    url lastPathComponent          print  Download Finished           DispatchQueue main async                  if let  img   UIImage data  data                     success  img                                  func getData from url  URL  completion   escaping  Data   URLResponse   Error   - gt            URLSession shared dataTask with  url  completionHandler  completion  resume       Usage  -    if let url   URL string   http   www apple com euro ios ios8 a generic images og png                             self downloadImage from url   success     image  in                             print image                              failure     failureReason  in                             print failureReason

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Swift 2 x answer that downloads image to file  as opposed to Leo Dabus s answer  which stores the image in memory   Based on Leo Dabus s answer and Rob s answer from Get the data from NSURLSession DownloadTaskWithRequest from completion handler          Set download vars     let downloadURL   NSURL      URL to download from     let localFilename    foobar png     Filename for storing locally          Create download request     let task   NSURLSession sharedSession   downloadTaskWithURL downloadURL    location  response  error in         guard location    nil  amp  amp  error    nil else               print  Error downloading message    error                return                       If here  no errors so save message to permanent location         let fileManager   NSFileManager defaultManager           do               let documents   try fileManager URLForDirectory  DocumentDirectory  inDomain   UserDomainMask  appropriateForURL  nil  create  false              let fileURL   documents URLByAppendingPathComponent localFilename              try fileManager moveItemAtURL location   toURL  fileURL              self doFileDownloaded fileURL  localFilename  localFilename              print  Downloaded message     localFilename              catch               print  Error downloading message    error                            Start download     print  Starting download     downloadURL        task resume        Helper function called after file successfully downloaded private func doFileDownloaded fileURL  NSURL  localFilename  String            Do stuff with downloaded image

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Swift 4  A simple loader for small images  ex  thumbnails  that uses NSCache and always runs on the main thread   class ImageLoader      private static let cache   NSCache lt NSString  NSData gt       class func image for url  URL  completionHandler   escaping   image  UIImage   - gt             DispatchQueue global qos  DispatchQoS QoSClass background  async          if let data   self cache object forKey  url absoluteString as NSString            DispatchQueue main async   completionHandler UIImage data  data as Data             return                guard let data   NSData contentsOf  url  else           DispatchQueue main async   completionHandler nil            return                self cache setObject data  forKey  url absoluteString as NSString        DispatchQueue main async   completionHandler UIImage data  data as Data                    Usage    ImageLoader image for  imageURL    image in   self imageView image   image

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You can use pod SDWebImage to achieve the same  Its easy to use  Yo can get documentaion here SDWebImage  Here is the sample code  self yourImage sd setImage with  NSURL string  StrUrl as String   as URL   placeholderImage  placeholderImage  options  SDWebImageOptions rawValue  0   completed     image  error  cacheType  imageURL  in                 if  error    nil                                        print  Error while displaying image     error  localizedDescription   as String

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I wrapped the code of the best answers to the question into a single  reusable class extending UIImageView  so you can directly use asynchronous loading UIImageViews in your storyboard  or create them from code    Here is my class   import Foundation import UIKit  class UIImageViewAsync  UIImageView        override init                 super init frame  CGRect               override init frame CGRect                super init frame frame             required init coder aDecoder  NSCoder            super init coder  aDecoder             func getDataFromUrl url String  completion    data  NSData   - gt  Void             NSURLSession sharedSession   dataTaskWithURL NSURL string  url       data  response  error  in             completion data  NSData data  data             resume              func downloadImage url String           getDataFromUrl url    data in             dispatch async dispatch get main queue                      self contentMode   UIViewContentMode ScaleAspectFill                 self image   UIImage data  data                                     and here is how to use it   imageView downloadImage  http   www image-server com myImage jpg

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Swift 4  This method will download an image from a website asynchronously and cache it       func getImageFromWeb   urlString  String  closure   escaping  UIImage   - gt                guard let url   URL string  urlString  else   return closure nil                    let task   URLSession configuration   default  dataTask with  url     data  response  error  in             guard error    nil else                   print  error    String describing  error                     return closure nil                            guard response    nil else                   print  no response                   return closure nil                            guard data    nil else                   print  no data                   return closure nil                            DispatchQueue main async                   closure UIImage data  data                             task resume           In use       getImageFromWeb  http   www apple com euro ios ios8 a generic images og png      image  in         if let image   image               let imageView   UIImageView frame  CGRect x  0  y  0  width  200  height  200               imageView image   image             self view addSubview imageView               if you use an Else statement  it will be in background

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For better performance in UITableView or UICollectionView use light weight library Smart Lazy Loading You can use this lazy loading approach if you want to load images from url Asynchronous   Smart  Lazy Loading  in UICollectionView or UITableView using NSOperation and NSOperationQueue in iOS So in this project we can download the multiple images in any View  UICollectionView or UITableView  by optimising the performance of an app by using Operation and OperationQueue for concurrency  following are the key point of this project Smart Lazy Loading  Creating image download Service  Prioritise the downloading based on the visibility of cells   ImageDownloadService class will create a singleton instance and have NSCache instance to cache the images that have been downloaded  We have inherited the Operation class to TOperation to mauled the functionality according to our need  I think the properties of the operation subclass are pretty clear in terms of functionality  We are monitoring operations changes of state by using KVO

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Xcode 8 or later     Swift 3 or later Synchronously  if let filePath   Bundle main path forResource   quot imageName quot   ofType   quot jpg quot    let image   UIImage contentsOfFile  filePath        imageView contentMode    scaleAspectFit     imageView image   image    Asynchronously  Create a method with a completion handler to get the image data from your url func getData from url  URL  completion   escaping  Data   URLResponse   Error   - gt            URLSession shared dataTask with  url  completionHandler  completion  resume      Create a method to download the image  start the task  func downloadImage from url  URL        print  quot Download Started quot       getData from  url    data  response  error in         guard let data   data  error    nil else   return           print response  suggestedFilename    url lastPathComponent          print  quot Download Finished quot           DispatchQueue main async      weak self  in             self  imageView image   UIImage data  data                     Usage  override func viewDidLoad         super viewDidLoad          Do any additional setup after loading the view  typically from a nib      print  quot Begin of code quot       let url   URL string   quot https   cdn arstechnica net wp-content uploads 2018 06 macOS-Mojave-Dynamic-Wallpaper-transition jpg quot         downloadImage from  url      print  quot End of code  The image will continue downloading in the background and it will be loaded when it ends  quot       Extension  extension UIImageView       func downloaded from url  URL  contentMode mode  UIView ContentMode    scaleAspectFit            contentMode   mode         URLSession shared dataTask with  url    data  response  error in             guard                 let httpURLResponse   response as  HTTPURLResponse  httpURLResponse statusCode    200                  let mimeType   response  mimeType  mimeType hasPrefix  quot image quot                    let data   data  error    nil                  let image   UIImage data  data                  else   return               DispatchQueue main async      weak self  in                 self  image   image                         resume             func downloaded from link  String  contentMode mode  UIView ContentMode    scaleAspectFit             guard let url   URL string  link  else   return           downloaded from  url  contentMode  mode           Usage  imageView downloaded from   quot https   cdn arstechnica net wp-content uploads 2018 06 macOS-Mojave-Dynamic-Wallpaper-transition jpg quot

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Xcode 12     Swift 5 Leo Dabus s answer is awesome  I just wanted to provide an all-in-one function solution  if let url   URL string   quot http   www apple com euro ios ios8 a generic images og png quot         let task   URLSession shared dataTask with  url    data  response  error in         guard let data   data  error    nil else   return                    DispatchQueue main async       execute on main thread             self imageView image   UIImage data  data                           task resume

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When using SwiftUI  SDWebImageSwiftUI is the best option   Add the dependancy via XCode s Swift Package Manager  https   github com SDWebImage SDWebImageSwiftUI git  Then just use WebImage   instead of Image    WebImage url  URL string   https   nokiatech github io heif content images ski jump 1440x960 heic

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I recommend using Kingfisher library to download images asynchronously  The best part about using Kingfisher is  it caches all the downloaded images by default with the image url as an id  Next time when you request to download image with that particular URl  it will load  it from cache   Usage   newsImage kf setImage with  imageUrl   placeholder  nil  options  nil  progressBlock  nil  completionHandler     image  error  cacheType  imageUrl  in                 if error    nil                      self activityIndicator stopAnimating                    else if error    nil                      self activityIndicator stopAnimating

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Use of Ascyimageview you can easy load imageurl in imageview   let image1Url URL   URL string    imageurl   as String   imageview imageURL   image1Url

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swift 3 with error handling  let url   URL string  arr indexPath row  as  String  if url    nil       DispatchQueue global   async           let data   try  Data contentsOf  url     make sure your image in this url does exist  otherwise unwrap in a if let check   try-catch         DispatchQueue main async               if data    nil                   cell imgView image   UIImage data data                else                  cell imgView image   UIImage named   default png                                     With Extension  extension UIImageView        func setCustomImage   imgURLString  String             guard let imageURLString   imgURLString else               self image   UIImage named   default png               return                   DispatchQueue global   async    weak self  in             let data   try  Data contentsOf  URL string  imageURLString                DispatchQueue main async                   self  image   data    nil   UIImage data  data     UIImage named   default png                                     Extension Usage  myImageView  setCustomImage  url     With Cache support  let imageCache   NSCache lt NSString  UIImage gt     extension UIImageView        func loadImageUsingCacheWithURLString   URLString  String  placeHolder  UIImage              self image   nil         if let cachedImage   imageCache object forKey  NSString string  URLString                 self image   cachedImage             return                    if let url   URL string  URLString                URLSession shared dataTask with  url  completionHandler     data  response  error  in                    print  RESPONSE FROM API    response                    if error    nil                       print  ERROR LOADING IMAGES FROM URL    String describing  error                         DispatchQueue main async    weak self  in                         self  image   placeHolder                                           return                                   DispatchQueue main async    weak self  in                     if let data   data                           if let downloadedImage   UIImage data  data                                imageCache setObject downloadedImage  forKey  NSString string  URLString                               self  image   downloadedImage                                                                                  resume

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