title: how to Change the name of bar button dynamically
body: <p>Can anyone please let me know how to convert the bar button item named as "save" to "update" in view controller while updating the data in table view controller.
  I am using ios 9, xcode 7.3 and swift 2.2.</p>
  
  <p>I am providing the sample code for the bar button.</p>
  
  <pre><code>@IBAction func save(sender: UIBarButtonItem) {
  
  //func Plus(sender: AnyObject) {
  
      if isUpdate == true{
          print("object id \(self.store?.objectID)")
          self.store?.sTitle = titlename.text
          self.store?.sNote = note.text
          //save.setTitle("my text here", forState: .Normal)
          let img = UIImage(named: "image.jpg")
          let imgData = UIImageJPEGRepresentation(img!,1)
          self.store?.sImage = imgData
          do {
              try appdelegate.managedObjectContext.save()
              self.navigationController?.popViewControllerAnimated(true)
          } catch let error as NSError  {
              print("Could not save \(error), \(error.userInfo)")
          }
  
      }else{
          //get the description of the entity
          let storeDescription = NSEntityDescription.entityForName("Store",inManagedObjectContext: appdelegate.managedObjectContext)
  
          //we create managed object to be inserted to core data
          let store = EventsandnotesStore(entity : storeDescription!,insertIntoManagedObjectContext:appdelegate.managedObjectContext)
          store.sTitle = titlename.text
          store.sNote = note.text
  
          let img = UIImage(named: "image.jpg")
          let imgData = UIImageJPEGRepresentation(img!,1)
  
         store.sImage = imgData
          do {
              try appdelegate.managedObjectContext.save()
              self.navigationController?.popViewControllerAnimated(true)
          } catch let error as NSError  {
              print("Could not save \(error), \(error.userInfo)")
          }
  
      }
  </code></pre>