swift

import UIKit
import CoreData

class tableViewController: UITableViewController {
    
    var listOfItems = [NSManagedObject]()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        
        self.navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Add, target: self, action: Selector("addItem"))
        
        
    }
    
    
    
    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return listOfItems.count
    }
    
    
    func addItem(){
        let alertController = UIAlertController(title: "Type something", message: "please type....", preferredStyle: .Alert)
        
        let confirmAction = UIAlertAction(title: "Confirm", style: UIAlertActionStyle.Default, handler: ({
            
            (_) in
            
            if let field = alertController.textFields![0] as? UITextField {
                
                self.saveItem(field.text!)
                //reload our list to update it
                self.tableView.reloadData()
                
            }
            
            
            }
            
        ))
        
        
        //cancel action
        
        let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler: nil)
        
        //adding a text field
        alertController.addTextFieldWithConfigurationHandler({
            (textField) in
            
            textField.placeholder = "Type in something!"
            
        })
        
        
        alertController.addAction(confirmAction)
        alertController.addAction(cancelAction)
        
        self.presentViewController(alertController, animated: true, completion: nil)
        
    }
    
    
    func saveItem(itemToSave : String){
        
        // this AppDelegete will control how our items are going to save
        let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
        let managedContext = appDelegate.managedObjectContext
        let entityz = NSEntityDescription.entityForName("ListEntity", inManagedObjectContext: managedContext)
        let item = NSManagedObject(entity: entityz!, insertIntoManagedObjectContext: managedContext)
        
        item.setValue(itemToSave, forKey: "item")
        //here we try to save an item
        
        
        do{
            
            try managedContext.save()
            
            listOfItems.append(item)
            
        }
            
            // this is where the try catch any potentiaonl error
        catch{
            print(" This is the the try method reporting an error Sir!")
        }
        
    }
    
    
    // fetch every item in our core date and apply it to our list
    override func viewWillAppear(animated: Bool) {
        let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
        let managedContext = appDelegate.managedObjectContext

        
        //creating our fetch request 
        let fecthRequest = NSFetchRequest(entityName: "ListEntity")
        
        do{
            
            let results = try managedContext.executeFetchRequest(fecthRequest)
            listOfItems = results as! [NSManagedObject]
        }
        
        catch {
            print ("something went wrong")
        }
    }
    
    
    
    
    
    //this func is built to remove items from our list
    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
        let managedContext = appDelegate.managedObjectContext
        
        //first we remove the item from our core date
        managedContext.deleteObject(listOfItems[indexPath.row])
        
        
        tableView.reloadRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Right)
        //second we remove the item from our list of items
        listOfItems.removeAtIndex(indexPath.row)
        
        
        //updating our list
        self.tableView.reloadData()
        
        
        

    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    
    
    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let kalia = tableView.dequeueReusableCellWithIdentifier("Kalia")! as UITableViewCell
        
        
        let item = listOfItems[indexPath.row]
        
        kalia.textLabel?.text = item.valueForKey("item") as! String
        
        return kalia
    }
    
    
    
    
    
    
}