adding NSInteger object to NSMutableArray

Question

I have an NSMutableArray

@interface DetailViewController : UIViewController <UITableViewDelegate, UITableViewDataSource> {

NSMutableArray *reponses;
}
@property (nonatomic, retain) NSMutableArray *reponses;

@end

and i'm trying to add in my array NSInteger object:

@synthesize reponses;



NSInteger val2 = [indexPath row];
[reponses addObject:[NSNumber numberWithInteger:val2]];
NSLog(@"the array is %@ and the value is %i",reponses, val2);

it won't work the object was not added to the array, this is what console shows:

the array is (null) and the value is 2

visakh7 · Accepted Answer · 2011-12-22 08:03:10Z

9

@Omz: is right. Make sure you have the array allocated and initialized. Please check the following code

NSMutableArray *array = [[NSMutableArray alloc] init];
NSInteger num = 7;
NSNumber *number = [NSNumber numberWithInt:num];
[ar addObject:number];
NSLog(@"Array %@",array);

I have checked this and it works. If array is no longer needed make sure you release it.

answered Dec 22, 2011 at 8:03

visakh7

26.4k8 gold badges57 silver badges69 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

tmr Over a year ago

for new folks (me), to convert NSNumber back to NSInteger (when retrieving information from the array), 'NSInteger num = [number integerValue];' (thank you 7KV7)

omz · Accepted Answer · 2011-12-22 07:55:09Z

4

You're not initializing your array, so it's still nil when you're trying to add to it.

self.responses = [NSMutableArray array];
//now you can add to it.

answered Dec 22, 2011 at 7:55

omz

53.6k5 gold badges133 silver badges141 bronze badges

Comments

Bani Uppal · Accepted Answer · 2011-12-22 07:58:47Z

2

You have not initialized the responses array. In your code, may be viewDidLoad, do:

reponses = [[NSMutableArray alloc] init];

Then add the object to your array.

NSInteger val2 = [indexPath row];
[self.reponses addObject:[NSNumber numberWithInteger:val2]];

That should work.

answered Dec 22, 2011 at 7:58

Bani Uppal

8669 silver badges17 bronze badges

Collectives™ on Stack Overflow

adding NSInteger object to NSMutableArray

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related