NSMutableArray does not add objects [duplicate]

Question

I think, I am doing a pretty basic mistake, but I am using an NSMutableArray and this somehow doesn't add the object, I'm sending it its way. I have a property (and synthesize)

@property (nonatomic, strong) NSMutableArray *kpiStorage;

and then:

ExampleObject *obj1 = [[ExampleObject alloc] init];
[kpiStorage addObject:obj1];
ExampleObject *obj2 =  [[ExampleObject alloc] init];
[kpiStorage addObject:obj2];

NSLog(@"kpistorage has:%@", [kpiStorage count]);

and that always returns (null) in the console. What am I misunderstanding?

Before posting your question, please be sure to look at the list of related questions that appear. This question has been answered over and over in the past. — rmaddy
– rmaddy, Commented Feb 23, 2013 at 16:47
I wasn't referring to search. As you type a question, SO shows you lots of possibly related questions. Always check them before submitting the question. — rmaddy
– rmaddy, Commented Feb 23, 2013 at 17:10

Guru · Accepted Answer · 2013-02-23 16:47:22Z

14

Make sure you allocated memory for kpiStorage.

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

answered Feb 23, 2013 at 16:47

Guru

22.1k10 gold badges69 silver badges106 bronze badges

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

Comments

Infinity · Accepted Answer · 2013-02-23 16:51:23Z

4

On top of forgetting to allocated memory for your NSMutableArray, your NSLog formatting is also wrong. Your app will crash when you run it. The following changes are needed

You will need to add

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

and change your NSLog to the following

NSLog(@"kpistorage has:%d", [self.kpiStorage count]);

answered Feb 23, 2013 at 16:51

Infinity

3,9452 gold badges29 silver badges35 bronze badges

Comments

Community · Accepted Answer · 2017-05-23 12:07:37Z

0

If you are not using ARC make sure you should not create a memory leak in your project. So better way would be allocating like this

NSMutableArray *array = [[NSMutableArray alloc] init];
self.kpiStorage = array;
[array release];

make it a habit to do not directly do

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

in this case your property's retain count is incremented by 2. For further reading you can stydy Memory Leak when retaining property

edited May 23, 2017 at 12:07

CommunityBot

11 silver badge

answered Feb 23, 2013 at 18:47

abdus.me

1,82922 silver badges34 bronze badges

1 Comment

Bablu Joshi Over a year ago

please make it strong type if it is a property !!

Collectives™ on Stack Overflow

NSMutableArray does not add objects [duplicate]

3 Answers 3

Comments

Comments

1 Comment

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

1 Comment

Linked

Related