ios 7 uitableview cell long press to change value of core data attribute

Question

I am using core data with an entity and several attributes. One of the attributes is named ToDoStatus. The list of the entity records are shown on a tableview and I want to implement following requirement: 1. When the user makes a long press on a cell (about 1 second), the record pressed must change its ToDoStatus value to "Done" and then reload the tableview not showing records with ToDoStatus = "Done". This is my current code:

#import "RootViewController.h"
#import "AddToDoViewController.h"
#import "EditToDoViewController.h"
#import "MenuViewController.h"


@interface RootViewController ()
- (void)configureCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath;
@end


@implementation RootViewController

@synthesize fetchedResultsController, managedObjectContext,AddToDoButton,MenuToDoButton;


#pragma mark -
#pragma mark View lifecycle

- (void)viewDidLoad {

  [super viewDidLoad];
//  [self setTitle:@"Today"];
  [[self navigationItem] setRightBarButtonItem:[self editButtonItem]];
    self.editButtonItem.tintColor = [UIColor redColor];

    UILabel *lblTitle = [[UILabel alloc] init];
    lblTitle.text = @"Today";
    lblTitle.backgroundColor = [UIColor clearColor];
    lblTitle.textColor = [UIColor blueColor];
    lblTitle.shadowColor = [UIColor whiteColor];
    lblTitle.shadowOffset = CGSizeMake(0, 1);
    lblTitle.font = [UIFont fontWithName:@"Noteworthy" size:25.0];
    [lblTitle sizeToFit];

    self.navigationItem.titleView = lblTitle;



    [self.editButtonItem setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                     [UIFont fontWithName:@"Noteworthy" size:20], NSFontAttributeName,
                                     [UIColor blueColor], NSForegroundColorAttributeName,
                                     nil]
                           forState:UIControlStateNormal];







    self.tableView.delegate = self;
    self.tableView.dataSource = self;


  NSError *error = nil;
  if (![[self fetchedResultsController] performFetch:&error])
  {
    NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
    abort();
  }
}
- (void) viewWillAppear:(BOOL)animated{
    NSError *error = nil;
    if (![[self fetchedResultsController] performFetch:&error])
    {
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();
    }
    [self.tableView reloadData];
}
- (void)configureCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath
{
  NSManagedObject *managedObject = [fetchedResultsController objectAtIndexPath:indexPath];





  [[cell textLabel] setText:[[managedObject valueForKey:@"thingName"] description]];
  NSString *myString = [NSString stringWithFormat:@"%@",[[managedObject valueForKey:@"todoYear"] description]];
    UIButton *urgentButton = [[UIButton alloc]initWithFrame:CGRectMake(15, 25, 18, 18)];

    [urgentButton setImage:[UIImage imageNamed:@"urgent"]forState:UIControlStateNormal];
    [cell addSubview:urgentButton];

    UIButton *yellowButton = [[UIButton alloc]initWithFrame:CGRectMake(305, 5, 10, 40)];

    [yellowButton setImage:[UIImage imageNamed:@"Red"]forState:UIControlStateNormal];
    [cell addSubview:yellowButton];

    UIButton *doneButton = [[UIButton alloc]initWithFrame:CGRectMake(33, 27, 18, 18)];

    [doneButton setImage:[UIImage imageNamed:@"alldone"]forState:UIControlStateNormal];
    [cell addSubview:doneButton];

    UIButton *doneButton2 = [[UIButton alloc]initWithFrame:CGRectMake(53, 27, 18, 18)];

    [doneButton2 setImage:[UIImage imageNamed:@"alldone"]forState:UIControlStateNormal];
    [cell addSubview:doneButton2];



    UIButton *doneButton3 = [[UIButton alloc]initWithFrame:CGRectMake(71, 27, 18, 18)];

    [doneButton3 setImage:[UIImage imageNamed:@"urgent"]forState:UIControlStateNormal];
    [cell addSubview:doneButton3];


    [[cell detailTextLabel] setText:@"  "];
  [cell setSelectionStyle:UITableViewCellSelectionStyleNone];
    cell.textLabel.textColor = [UIColor blueColor];
    cell.textLabel.font = [UIFont fontWithName:@"Noteworthy" size:22.0f];
    cell.detailTextLabel.font = [UIFont fontWithName:@"Noteworthy" size:15.0f];

}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {


    EditToDoViewController *detailViewController = [[EditToDoViewController alloc] initWithNibName:@"EditToDoViewController" bundle:nil];
    NSManagedObject *selectedObject = [[self fetchedResultsController] objectAtIndexPath:indexPath];
    detailViewController.selectedObject = selectedObject;
    //[self.navigationController pushViewController:detailViewController animated:YES];

    [self presentViewController:detailViewController animated:YES completion:nil];
}




#pragma mark -
#pragma mark Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
  return [[fetchedResultsController sections] count];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
  id <NSFetchedResultsSectionInfo> sectionInfo = [[fetchedResultsController sections] objectAtIndex:section];
  return [sectionInfo numberOfObjects];
}



- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
  static NSString *CellIdentifier = @"Cell";

  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
  if (cell == nil)
  {
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle 
                                   reuseIdentifier:@"Cell"] autorelease];
  }

  [self configureCell:cell atIndexPath:indexPath];

  return cell;
}

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
  if (editingStyle == UITableViewCellEditingStyleDelete)
  {
    NSManagedObjectContext *context = [fetchedResultsController managedObjectContext];
    [context deleteObject:[fetchedResultsController objectAtIndexPath:indexPath]];

    NSError *error = nil;
    if (![context save:&error])
    {
      NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
      abort();
    }
  }   
}

- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
  return YES;
}

- (void)tableView:(UITableView *)tableView 
moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath 
      toIndexPath:(NSIndexPath *)destinationIndexPath;
{  
  NSMutableArray *things = [[fetchedResultsController fetchedObjects] mutableCopy];

  // Grab the item we're moving.
  NSManagedObject *thing = [[self fetchedResultsController] objectAtIndexPath:sourceIndexPath];

  // Remove the object we're moving from the array.
  [things removeObject:thing];
  // Now re-insert it at the destination.
  [things insertObject:thing atIndex:[destinationIndexPath row]];

  // All of the objects are now in their correct order. Update each
  // object's displayOrder field by iterating through the array.
  int i = 0;
  for (NSManagedObject *mo in things)
  {
    [mo setValue:[NSNumber numberWithInt:i++] forKey:@"displayOrder"];
  }

  [things release], things = nil;

  [managedObjectContext save:nil];
}






#pragma mark -
#pragma mark Fetched results controller
- (IBAction)AddToDoAction:(id)sender {

    AddToDoViewController *viewController = [[AddToDoViewController alloc] init];
    [self presentViewController:viewController animated:YES completion:nil];

}
#pragma mark Fetched results controller
- (IBAction)MenuToDoAction:(id)sender {

    MenuViewController *viewController = [[MenuViewController alloc] init];
    [self presentViewController:viewController animated:YES completion:nil];

}

- (NSFetchedResultsController *)fetchedResultsController
{
  if (fetchedResultsController) return fetchedResultsController;

  NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
  NSEntityDescription *entity = 
               [NSEntityDescription entityForName:@"FavoriteThing" 
                           inManagedObjectContext:managedObjectContext];

  [fetchRequest setEntity:entity];

  NSSortDescriptor *sortDescriptor = 
              [[NSSortDescriptor alloc] initWithKey:@"displayOrder" 
                                          ascending:YES];

  NSArray *sortDescriptors = [[NSArray alloc] 
                              initWithObjects:sortDescriptor, nil];



    NSNumber *yearBuscado = @2013;
    NSNumber *mesBuscado = @12;
    NSNumber *diaBuscado = @13;
    NSString *tipourgente = @"Urgent";
    NSString *tipocolor = @"Yellow";
    NSPredicate *yearPredicate = [NSPredicate predicateWithFormat:@"todoYear == %@", yearBuscado];
    NSPredicate *monthPredicate = [NSPredicate predicateWithFormat:@"todoMonth == %@", mesBuscado];
    NSPredicate *dayPredicate = [NSPredicate predicateWithFormat:@"todoDay == %@", diaBuscado];
    NSPredicate *urgentPredicate = [NSPredicate predicateWithFormat:@"urgent == %@", tipourgente];
    NSPredicate *colorPredicate = [NSPredicate predicateWithFormat:@"color == %@", tipocolor];

  [fetchRequest setSortDescriptors:sortDescriptors];






  NSPredicate *busqueda = [NSCompoundPredicate andPredicateWithSubpredicates:@[yearPredicate, monthPredicate,dayPredicate,urgentPredicate]];

    [fetchRequest setPredicate:busqueda];
  NSFetchedResultsController *aFetchedResultsController =
              [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest 
                                                  managedObjectContext:managedObjectContext
                                                    sectionNameKeyPath:nil cacheName:nil];
  aFetchedResultsController.delegate = self;
  [self setFetchedResultsController:aFetchedResultsController];


  [aFetchedResultsController release];
  [fetchRequest release];
  [sortDescriptor release];
  [sortDescriptors release];


  return fetchedResultsController;
}    

- (void)dealloc {
  [fetchedResultsController release];
  [managedObjectContext release];


  [super dealloc];
}


@end

Answer 1

Here is how you handle a long press:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil)
    {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle 
        reuseIdentifier:@"Cell"] autorelease];
    }

    UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc]
                     initWithTarget:self action:@selector(handleLongPress:)];
    lpgr.minimumPressDuration = 1.0; //seconds
    [cell addGestureRecognizer:lpgr];

    [self configureCell:cell atIndexPath:indexPath];

    return cell;
}

-(void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer 
{
            CGPoint p = [gestureRecognizer locationInView:self.tableView];

            NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:p];
            if (indexPath == nil)
               NSLog(@"long press on table view but not on a row");
            else
            {
                 if (gestureRecognizer.state == UIGestureRecognizerStateEnded) {
                     NSLog(@"UIGestureRecognizerStateEnded");
                     //Do Whatever You want on End of Gesture
                 }
                 else if (gestureRecognizer.state == UIGestureRecognizerStateBegan){

                     UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Announcement" message: @"You have long-pressed the row...!" delegate: nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
                     [alert show];
                     [alert release];
                     NSLog(@"UIGestureRecognizerStateBegan.");


                     NSLog(@"long press on table view at row %d", indexPath.row);

                     // Update ToDoStatus
                    [self.tableView reloadData];
                    //Do Whatever You want on Began of Gesture
                 }
            }
}

Your model will keep track of ToDoStatus in your model and then decide how that will be displayed in the UI.