Cache image attachments

Tusker/ImageCache.swift

@@ -13,6 +13,7 @@ class ImageCache {
     
     static let avatars = ImageCache(name: "Avatars")
     static let headers = ImageCache(name: "Headers")
+    static let attachments = ImageCache(name: "Attachments", diskExpiry: .seconds(60 * 60), memoryExpiry: .seconds(60))
 
     let storage: Storage<UIImage>
     

Tusker/Views/AttachmentView.swift

@@ -19,8 +19,6 @@ class AttachmentView: UIImageView {
     
     var attachment: Attachment!
     
-    var task: URLSessionDataTask?
-    
     required init?(coder aDecoder: NSCoder) {
         super.init(coder: aDecoder)
         commonInit()
@@ -45,13 +43,11 @@ class AttachmentView: UIImageView {
     }
     
     func loadImage() {
-        task = URLSession.shared.dataTask(with: attachment.url) { data, response, error in
+        ImageCache.attachments.get(attachment.url) { (image) in
-            guard error == nil, let data = data, let image = UIImage(data: data) else { return }
             DispatchQueue.main.async {
                 self.image = image
             }
         }
-        task!.resume()
     }
     
     @objc func imagePressed() {

Tusker/Views/Status/ConversationMainStatusTableViewCell.swift

@@ -85,7 +85,6 @@ class ConversationMainStatusTableViewCell: UITableViewCell, PreferencesAdaptive
         }
         updateTimestamp()
         
-        attachmentsView.subviews.forEach { $0.removeFromSuperview() }
         let attachments = status.attachments.filter({ $0.kind == .image })
         if attachments.count > 0 {
             attachmentsView.isHidden = false
@@ -155,9 +154,7 @@ class ConversationMainStatusTableViewCell: UITableViewCell, PreferencesAdaptive
         }
         updateTimestampWorkItem?.cancel()
         updateTimestampWorkItem = nil
-        attachmentsView.subviews.forEach { view in
+        attachmentsView.subviews.forEach { $0.removeFromSuperview() }
-            (view as? AttachmentView)?.task?.cancel()
-        }
     }
     
     @objc func accountPressed() {

Tusker/Views/Status/StatusTableViewCell.swift

@@ -170,10 +170,7 @@ class StatusTableViewCell: UITableViewCell, PreferencesAdaptive {
         }
         updateTimestampWorkItem?.cancel()
         updateTimestampWorkItem = nil
-        attachmentsView.subviews.forEach { view in
+        attachmentsView.subviews.forEach { $0.removeFromSuperview() }
-            (view as? AttachmentView)?.task?.cancel()
-            view.removeFromSuperview()
-        }
     }
 
     override func setSelected(_ selected: Bool, animated: Bool) {