fix cached images issue at gfy, mfy

@@ -13,6 +13,24 @@ import UIKit
     @IBOutlet weak var newBadgeImage: UIImageView!
     @IBOutlet weak var campaignTitleLabel: UILabel!
 
+    var postImageURL: String? {
+        didSet {
+            if let url = postImageURL {
+                self.campaignImage.image = UIImage() // UIImage(named: "loading")
+
+                UIImage.loadImageUsingCacheWithUrlString(url) { image in
+                    // set the image only when we are still displaying the content for the image we finished downloading
+                    if url == self.postImageURL {
+                        self.campaignImage.image = image
+                    }
+                }
+            }
+            else {
+                self.campaignImage.image = nil
+            }
+        }
+    }
+    
     public override func awakeFromNib() {
         super.awakeFromNib()
         
@@ -43,7 +61,8 @@ import UIKit
     
     
     func configureCell(campaign: swiftApi.CampaignItemModel) {
-        campaignImage.load(link: campaign.logo_url ?? "", placeholder: UIImage(), cache: URLCache())
+        // campaignImage.load(link: campaign.logo_url ?? "", placeholder: UIImage(), cache: URLCache())
+        self.postImageURL = campaign.logo_url ?? ""
         
         campaignTitleLabel.text = campaign.title ?? ""
         
@@ -55,7 +74,8 @@ import UIKit
     }
 
     func configureCell(ccms: swiftApi.LoyaltyContextualOfferModel) {
-        campaignImage.load(link: ccms._imageUrl , placeholder: UIImage(), cache: URLCache())
+        // campaignImage.load(link: ccms._imageUrl , placeholder: UIImage(), cache: URLCache())
+        self.postImageURL = ccms._imageUrl
         
         campaignTitleLabel.text = ccms._title
         

@@ -16,6 +16,24 @@ import UIKit
     @IBOutlet weak var subtitleLabel: UILabel!
     @IBOutlet weak var descriptionLabel: UILabel!
 
+    var postImageURL: String? {
+        didSet {
+            if let url = postImageURL {
+                self.campaignImage.image = UIImage() // UIImage(named: "loading")
+
+                UIImage.loadImageUsingCacheWithUrlString(url) { image in
+                    // set the image only when we are still displaying the content for the image we finished downloading
+                    if url == self.postImageURL {
+                        self.campaignImage.image = image
+                    }
+                }
+            }
+            else {
+                self.campaignImage.image = nil
+            }
+        }
+    }
+    
     public override func awakeFromNib() {
         super.awakeFromNib()
         
@@ -43,7 +61,8 @@ import UIKit
     
     
     func configureCell(campaign: swiftApi.CampaignItemModel) {
-        campaignImage.load(link: campaign.logo_url ?? "", placeholder: UIImage(), cache: URLCache())
+        // campaignImage.load(link: campaign.logo_url ?? "", placeholder: UIImage(), cache: URLCache())
+        self.postImageURL = campaign.logo_url ?? ""
         
         campaignTitleLabel.text = campaign.title ?? ""
         campaignTitleLabel.font = UIFont(name: "PFSquareSansPro-BoldItalic", size: 18)
@@ -60,7 +79,8 @@ import UIKit
     }
 
     func configureCell(ccms: swiftApi.LoyaltyContextualOfferModel) {
-        campaignImage.load(link: ccms._imageUrl , placeholder: UIImage(), cache: URLCache())
+        // campaignImage.load(link: ccms._imageUrl , placeholder: UIImage(), cache: URLCache())
+        self.postImageURL = ccms._imageUrl
         
         campaignTitleLabel.text = ccms._title
         campaignTitleLabel.font = UIFont(name: "PFSquareSansPro-BoldItalic", size: 18)

@@ -225,6 +225,33 @@ extension UIImageView {
     }
 }
 
+let imageCache = NSCache<NSString, AnyObject>()
+extension UIImage {
+    static func loadImageUsingCacheWithUrlString(_ urlString: String, completion: @escaping (UIImage) -> Void) {
+        if let cachedImage = imageCache.object(forKey: urlString as NSString) as? UIImage {
+            completion(cachedImage)
+            
+        } else {
+            //No cache, so create new one and set image
+            let url = URL(string: urlString)
+            URLSession.shared.dataTask(with: url!, completionHandler: { (data, response, error) in
+                if let error = error {
+                    print(error)
+                    return
+                }
+
+                DispatchQueue.main.async(execute: {
+                    if let downloadedImage = UIImage(data: data!) {
+                        imageCache.setObject(downloadedImage, forKey: urlString as NSString)
+                        completion(downloadedImage)
+                    }
+                })
+
+            }).resume()
+        }
+    }
+}
+
 typealias GradientPoints = (startPoint: CGPoint, endPoint: CGPoint)
 
 enum GradientOrientation {