Objective C adding items to nsmutablearray returning nil

Question

I am trying to add items from an NSArray to an NSMutableArray like so:

for(int i = 0; i < [tableData count]; i++){
        [purchaseOrder.objects addObject:[tableData objectAtIndex:i]];
        NSLog(@"%@",[tableData objectAtIndex:i]);
    }

    NSLog(@"%@", purchaseOrder.objects);

but purchaseOrder.objects returns nil: here is what NSLog(@"%@",[tableData objectAtIndex:i]); is returning:

2015-04-30 08:57:36.510 MyApp[7055:1475885] {
    POIndex = "094 Spray Foam";
    PONumber = "ABC123/028";
}
2015-04-30 08:57:36.511 MyApp[7055:1475885] {
    POIndex = "095 Drywall";
    PONumber = "ABC124/029";
}
2015-04-30 08:57:36.511 MyApp[7055:1475885] {
    POIndex = "100 Stairs";
    PONumber = "ABC125/032";
}

I am looking for away to have the PONumber as the key and POIndex as the value. Here is how my arrays are defined:

MasterController:

@property NSMutableArray *objects;

Detailer Controller:

 NSArray *tableData = [dataSource.areaData GetPurchaseOrderItems:[NSString stringWithFormat:@"%@%@",areaPickerSelectionString,unitPickerSelectionString]];

I expect `purchaseOrder.objects` has not been allocated. Also look at `[NSMutableArray addObjectsFromArray:]`. — trojanfoe, Apr 30 '15 at 13:11
if (!purschaseOrder.objects) purchaseOrder.objects = [NSMutableArray array]; — Bogdan Matveev, Apr 30 '15 at 13:15
The `PurchaseOrder` object should do it in its `init` method. — trojanfoe, Apr 30 '15 at 13:21

score 3 · Accepted Answer · answered Apr 30 '15 at 13:19

3

You must initialize your MutableArray before use .

write below code before you for loop.

if(!purchaseOrder.objects){// If Array not initialize 
    purchaseOrder.objects = [[NSMutableArray alloc]init];
}

Hope This helps you.

answered Apr 30 '15 at 13:19

Malav Soni

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Shouldn't the `PurchaseObject` be doing it instead? – trojanfoe Apr 30 '15 at 13:21
that works, but now my purchaseOrder is being populated like to: `POIndex, PONumber, POIndex, PONumber, POIndex, PONumber` how do I get the PONumber as the key and POIndex as the value ? – user979331 Apr 30 '15 at 13:22
can you add some logs in your question for that. – Malav Soni Apr 30 '15 at 13:23
@user979331 That's a different question so create a new question. Also if that has solved your problem, don't you think an upvote is in order? – trojanfoe Apr 30 '15 at 13:23
I will help you but if my answer solve your posted issue please mark this as answer and upvote it. – Malav Soni Apr 30 '15 at 13:28

score 0 · Answer 2 · answered Apr 30 '15 at 13:33

First you need to allocate the PurchaseObjects as below

purchaseOrder.objects = [[NSMutableArray alloc]init];

And then use below code

NSMutableDictionary *subDict=[[NSMutableDictionary alloc]init];
for (NSDictionary *dict in tableData) {
    [subDict setValue:[dict objectForKey:@"POIndex"] forKey:[dict objectForKey:@"PONumber"]];
    [purchaseOrder.objects addObject:subDict];
}
NSLog(@"@@@@@@@purchaseOrder.objects Array is:%@",purchaseOrder.objects);

It will result in the array with dictionaries with required content..

Hope it helps you..

Objective C adding items to nsmutablearray returning nil

2 Answers2