CODEWITHSUNDEEP
objective-ciosxcode
Emil
Emil

Reputation: 126

NSMutableArray keeps returning null

I have declared a property NSMutableArray in the header file. Then I alloc, init it in the viewDidLoad method. But when I try to add an object to the array in a different method it keeps returning (null). Am I doing some obvious mistake? Please ask if you want to see some more code.

.h

@property (strong, nonatomic) NSMutableArray *myList;

.m

- (void)viewDidLoad
{
    self.dataController = [[DataController alloc]init];

    self.myList = [[NSMutableArray alloc] init];

    [super viewDidLoad];
}

[...]

NSDictionary *myObject = [self.dataController.objectList objectAtIndex:r];
[[cell textLabel]setText:[myObject objectForKey:@"title"]];

[self.myList addObject:myObject]; 

NSLog(@"myList %@",self.myList);
NSLog(@"myObject %@",myObject);

The output prints myObject but self.myList keeps returning (null). Appreciate all help!

Edit: Fixed, thank you for your answers!

Upvotes: 1

Views: 1214

Answers (3)

iDev
iDev

Reputation: 23278

Not sure where you are using this array. If you have to use this array before viewDidLoad is called, you can do it as,

NSDictionary *myObject = [self.dataController.objectList objectAtIndex:r];
[[cell textLabel]setText:[myObject objectForKey:@"title"]];

if (!self.myList)
    self.myList = [[NSMutableArray alloc] init];//for the first time, this will initialize

[self.myList addObject:myObject];

Since you are using [cell textLabel] I am assuming that you are doing this in one of the table view delegates. In that case check if you are setting self.myList = nil; any where in the class.

Upvotes: 1

Klaas
Klaas

Reputation: 22773

I bet that viewDidLoad hasn't been called yet when the NSLogs are execute.

To ensure that the array has been initialized, try putting the initialization in your init method.

Upvotes: 0

AlexWien
AlexWien

Reputation: 28767

In your posted code i see no error. Set a breakpoint and look if the code where you init the array is called first.

Upvotes: 0

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