IOS/Objective-c: Issue with "real time" save into coreData

Question

my app is coreData based, uses mapKit, and spot annotations. The app runs with all it's functionalities; the main issue is that when i input a new location on this text field, this new spot does not appear in the Table View like it should. Only when I restart the app, the table is refreshed and the new spot is available despite having the tableview reload instruction. Does anyone have a clue why this happens and how I can fix it? Thank you. The code for the table view:

@interface TableViewController ()

@property (strong) NSMutableArray *lisbonSpots;


@end

@implementation TableTableViewController

- (IBAction)delete:(UIBarButtonItem *)sender {
     self.tableView.editing = !self.tableView.editing;
}

- (void)viewDidLoad {
    [super viewDidLoad];

    //_bar=[Spot spotType:@"bar"];


    self.tableView.dataSource = self;

    _lisbonSpots = [[Spot allSpots]mutableCopy];
    NSLog(@"The Core Spots are: %@", _lisbonSpots);

    [self.tableView reloadData];

}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

    return 1;
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    return 0;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    return self.lisbonSpots.count;

}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];

    NSManagedObject *ls = [self.lisbonSpots objectAtIndex:indexPath.row];
    NSLog(@"Table Spots are: %@", ls);
    [cell.textLabel setText:[NSString stringWithFormat:@"%@", [ls valueForKey:@"name"]]];
    cell.imageView.image = [UIImage imageNamed:@"city.jpg"];
    return cell;
}

Answer 1

I believe the issue you are having is due to calling reloadData inside viewDidLoad.

Only when I restart the app, the table is refreshed and the new spot is available despite having the tableview reload instruction

viewDidLoad should be used for initial setup work or "one-time" only work when setting up your view controller. It is most likely only called ONCE per application launch. For more information on view controller lifecycles refer to this answer: Looking to understand the iOS UIViewController lifecycle.

Try moving your reloadData call to viewDidAppear like this:

- (void)viewDidAppear {
    [super viewDidAppear];
    _lisbonSpots = [[Spot allSpots]mutableCopy];

    [self.tableView reloadData];
}

Answer 2

Try fetching the data with NSFetchedResultscontroller: Following code in a single method that is called on initialize, create an instance variable for NSFetchedResultscontroller *fetchedController;

NSManagedObjectContext *context = <#Managed object context#>;
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
// Configure the request's entity, and optionally its predicate.
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"<#Sort key#>" ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
[fetchRequest setSortDescriptors:sortDescriptors];
[sortDescriptors release];
[sortDescriptor release];

NSFetchedResultsController *controller = [[NSFetchedResultsController alloc]
    initWithFetchRequest:fetchRequest
    managedObjectContext:context
    sectionNameKeyPath:nil
    cacheName:@"<#Cache name#>"];
[fetchRequest release];

NSError *error;
BOOL success = [controller performFetch:&error];

And the tableView Delegate methods, the fetchedResultsController does the fetching process after inserting or removing for you. (Code is from Apple Docs)

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return [[<#Fetched results controller#> sections] count];
}

- (NSInteger)tableView:(UITableView *)table numberOfRowsInSection (NSInteger)section {
    if ([[<#Fetched results controller#> sections] count] > 0) {
    id <NSFetchedResultsSectionInfo> sectionInfo = [[<#Fetched results controller#> sections] objectAtIndex:section];
    return [sectionInfo numberOfObjects];
} else
    return 0;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

   UITableViewCell *cell = <#Get the cell#>; // Your chase [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
   NSManagedObject *managedObject = [<#Fetched results controller#> objectAtIndexPath:indexPath];
   // Configure the cell with data from the managed object.
   return cell;
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
    if ([[<#Fetched results controller#> sections] count] > 0) {
    id <NSFetchedResultsSectionInfo> sectionInfo = [[<#Fetched results controller#> sections] objectAtIndex:section];
    return [sectionInfo name];
} else
    return nil;
}

- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
    return [<#Fetched results controller#> sectionIndexTitles];
}

- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index {
return [<#Fetched results controller#> sectionForSectionIndexTitle:title atIndex:index];
}

Hope it helps you out!