So ändern Sie den Namen der bar-Taste dynamisch

Question

Kann mir bitte jemand wissen, wie man die bar-Schaltfläche namens "Speichern" in "update" in der Ansicht Controller während der Aktualisierung der Daten in der Tabellenansicht Controller konvertieren. Ich verwende ios 9, xcode 7.3 und swift 2.2.

Ich stelle den Beispielcode für die Schaltfläche bar.

@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)") 
     } 

    } 

Answer 1

ändern Titel wie dies in Ihrem viewDidLoad

if (isUpdate == true) { 
    let item = self.navigationItem.rightBarButtonItem 
    item?.title = "Update" 
} 

Answer 2

du in der viewDidLoad() Methode machen könnte:

if let item = self.navigationItem.rightBarButtonItem { 
     item.title = isUpdate ? "Update" : "Save" 
}