populate a table view using an array from core data

Question

Am try to populate my table from core data and it give an error at this line

Tips *tipy = [arr objectAtIndex:indexPath.row];

here is my .m file

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

    return 1;
}

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

    return [arr count];
}

- (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:CellIdentifier];
    }
    Tips *tipy = [arr objectAtIndex:indexPath.row]; 
    cell.textLabel.text = [tipy tipdescription];
    cell.detailTextLabel.text = [tipy.tipnumber stringValue];

    return cell;
}

app and arr is declared in the .h file as and also synthesized in the .m file

@property (nonatomic, retain) AppDelegate *app;
@property(nonatomic, assign) NSArray *arr;

what error do you have ? did you "#import Tips" in your file ? Did you synthesized the property ? if so you shoukd write "self.arr" instead of arr — moxy
– moxy, Commented Jul 21, 2012 at 9:36

Shabib · Accepted Answer · 2012-07-21 10:05:01Z

5

As moxy said, you should write self.arr instead of arr. You have set @property(nonatomic, assaign) NSArray *arr; Did you synthesized those properties? Be sure to do that. And Try @property(nonatomic, retain) NSArray *arr; instead of @property(nonatomic, assaign) NSArray *arr;. The assaign does not increase the retain count thus there is a chance that the value can be autoreleased. Don't forget to release the arr in dealloc to avoid memory leak.

answered Jul 21, 2012 at 10:05

community wiki

Shabib

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2 Comments

Jay Kanyi Over a year ago

thanks alot. the problem was coz i did not use retain in my array

Shabib Over a year ago

if this answer helped you, accept it. you should accept answers according to Stackoverflow FAQ

zrzka · Accepted Answer · 2012-07-21 10:01:07Z

0

Just guessing, because there's not enough code to check, but NSManagedObjectContext's executeFetchRequest:error: does return autoreleased NSArray and your property arr is defined as assign, not strong/retain => your NSArray is released and arr points to trash. Maybe this is the cause, but as I said, there's not enough code to be sure.

answered Jul 21, 2012 at 10:01

zrzka

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