Loading/null state for comments table view

Client/Post/CommentsViewController.swift

@@ -10,12 +10,12 @@ import Foundation
 import UIKit
 import SafariServices
 
-class CommentsViewController : UIViewController, UITableViewDelegate, UITableViewDataSource, CommentDelegate, SFSafariViewControllerDelegate, PostTitleViewDelegate {
+class CommentsViewController : UIViewController, UITableViewDelegate, UITableViewDataSource, CommentDelegate, SFSafariViewControllerDelegate, PostTitleViewDelegate, DZNEmptyDataSetSource, DZNEmptyDataSetDelegate {
     var post: HNPost?
 
-    var comments: [CommentModel] = [CommentModel]() {
+    var comments: [CommentModel]? {
         didSet {
-            commentsController.comments = comments
+            commentsController.comments = comments!
         }
     }
 
@@ -30,11 +30,11 @@ class CommentsViewController : UIViewController, UITableViewDelegate, UITableVie
         setupPostTitleView()
         tableView.estimatedRowHeight = 44.0
         tableView.rowHeight = UITableViewAutomaticDimension
+        tableView.emptyDataSetSource = self;
+        tableView.emptyDataSetDelegate = self;
 
         commentsController = CommentsController()
-        if comments.count == 0 {
-            loadComments()
-        }
+        loadComments()
     }
 
     override func viewWillAppear(animated: Bool) {
@@ -70,7 +70,7 @@ class CommentsViewController : UIViewController, UITableViewDelegate, UITableVie
         }
     }
 
-    // MARK - UITableViewDataSource
+    // MARK: - UITableViewDataSource
 
     func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
         return commentsController.visibleComments.count
@@ -93,6 +93,14 @@ class CommentsViewController : UIViewController, UITableViewDelegate, UITableVie
         return cell
     }
 
+    // MARK: - DZNEmptyDataSet
+
+    func titleForEmptyDataSet(scrollView: UIScrollView!) -> NSAttributedString! {
+        return comments == nil ? NSAttributedString(string: "Loading comments") : NSAttributedString(string: "No comments")
+    }
+
+    // MARK: - Cell Actions
+
     func commentTapped(sender: UITableViewCell) {
         let indexPath = tableView.indexPathForCell(sender)
         toggleCellVisibilityForCell(indexPath)

Client/Supporting Files/Hackers2-Bridging-Header.h

@@ -3,3 +3,4 @@
 //
 
 #import <libHN/libHN.h>
+#import <DZNEmptyDataSet/UIScrollView+EmptyDataSet.h>

Podfile

@@ -2,3 +2,4 @@ platform :ios, '8.0'
 source 'https://github.com/CocoaPods/Specs.git'
 
 pod 'libHN'
+pod 'DZNEmptyDataSet'

Podfile.lock

@@ -1,10 +1,13 @@
 PODS:
+  - DZNEmptyDataSet (1.7.3)
   - libHN (4.1.0)
 
 DEPENDENCIES:
+  - DZNEmptyDataSet
   - libHN
 
 SPEC CHECKSUMS:
+  DZNEmptyDataSet: dd7cca17c1d07dfa78956859b1e70a52505678ef
   libHN: ec0205556a35d760b5b6a7804699f67276d6633a
 
 COCOAPODS: 0.39.0