TableView not displaying Cell Content - ios

Question

I am Using core data as my data base. Inside my UITableView I have a button to add projects , But at this moment I only Use it to add names. But the names I add do not display on the tableview.
I think my problem is that I need to repopulate my projectArray, how and where do I do that.
Here is my code:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [_projectArray count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
Project* project = _projectArray[indexPath.row];
static NSString *cellID = #"TableCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID forIndexPath:indexPath];
cell.textLabel.text = project.name;
cell.detailTextLabel.text = #"prooo";
self.tableView.delegate = self;
self.tableView.dataSource = self;
return cell;
}
Here is my button code:
- (IBAction)addProjectButton:(id)sender {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Enter new project name."
message:nil
delegate:self
cancelButtonTitle:#"Cancel"
otherButtonTitles:#"Ok", nil];
alert.alertViewStyle = UIAlertViewStylePlainTextInput;
[alert show];
UITextField *textField = [alert textFieldAtIndex:0];
textField.placeholder = #"Project Name";
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
if (buttonIndex != alertView.cancelButtonIndex) {
UITextField *field = [alertView textFieldAtIndex:0];
AppDelegate *delegate = [UIApplication sharedApplication].delegate;
NSManagedObjectContext *context = [delegate managedObjectContext];
NSManagedObject *object =[NSEntityDescription insertNewObjectForEntityForName:#"Project" inManagedObjectContext:context];
[object setValue:field.text forKey:#"name"];
NSError *error;
[context save:&error];
if (![context save:&error]) {
NSLog(#"Whoops %# %#", error, [error localizedDescription]);
}
[self.tableView reloadData];
} else {
NSLog(#"cancel");
}
}
And here is my ViewWillAppear Code , where I fetch info:
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:nil];
AppDelegate *delegate = [UIApplication sharedApplication].delegate;
NSManagedObjectContext *context = [delegate managedObjectContext];
//load project
NSFetchRequest *fetch = [[NSFetchRequest alloc]init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"Project" inManagedObjectContext:context];
[fetch setEntity:entity];
NSError *error;
_projectArray = [context executeFetchRequest:fetch error:&error];
}

Answer 1

There are many things you can do. To make it a good code, I will suggest write a method that reloads your array. Like this
-(void) reloadArray
{
AppDelegate *delegate = [UIApplication sharedApplication].delegate;
NSManagedObjectContext *context = [delegate managedObjectContext];
//load project
NSFetchRequest *fetch = [[NSFetchRequest alloc]init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"Project" inManagedObjectContext:context];
[fetch setEntity:entity];
NSError *error;
_projectArray = [context executeFetchRequest:fetch error:&error];
}
Then replace your viewDidAppear like this -
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:nil];
[self reloadArray];
}
Also in your numberOfSectionsInTableView: method, make this change -
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
[self reloadArray];
return 1;
}
And it should do the magic...

Answer 2

Have you set the dataSource and delegate properties of tableView?
self.tableView.delegate = self;
self.tableView.dataSource = self;

Answer 3

Change This :
NSFetchRequest *fetch = [[NSFetchRequest alloc]init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"Project" inManagedObjectContext:context];
[fetch setEntity:entity];
NSError *error;
_projectArray = [context executeFetchRequest:fetch error:&error];
To:
_projectArray = [[NSMutableArray alloc]init];
NSFetchRequest *fetch = [[NSFetchRequest alloc]init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"Project" inManagedObjectContext:context];
[fetch setEntity:entity];
NSManagedObject *object = nil;
NSError *error;
NSArray *result = [context executeFetchRequest:fetch error:&error];
for (int i = 0; i < [result count]; i ++) {
object = [result objectAtIndex:i];
[_projectArray setObject:[object valueForKey:#"name"]
}