Improve README

README.md

@@ -62,14 +62,22 @@ Hooking up your table view to your `Task` model and making your UITableView reac
 
 **Swift:**
 ```swift
-let request: NSFetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Task")
-request.sortDescriptors = [NSSortDescriptor(key: "title", ascending: true)]
+lazy var dataSource: DATASource = {
+    let request: NSFetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Task")
+    request.sortDescriptors = [NSSortDescriptor(key: "title", ascending: true)]
 
-let dataSource = DATASource(tableView: self.tableView, cellIdentifier: "Cell", fetchRequest: request, mainContext: self.dataStack.mainContext, configuration: { cell, item, indexPath in
-    cell.textLabel?.text = item.valueForKey("title") as? String
-})
+    let dataSource = DATASource(tableView: self.tableView, cellIdentifier: "Cell", fetchRequest: request, mainContext: self.dataStack.mainContext, configuration: { cell, item, indexPath in
+        cell.textLabel?.text = item.valueForKey("title") as? String
+    })
 
-tableView.dataSource = dataSource
+    return dataSource  
+}()
+
+override func viewDidLoad() {
+  super.viewDidLoad()
+
+  self.tableView.dataSource = self.dataSource
+}
 ```
 
 **Objective-C:**