Question

I’m really frustrated after spending like three hours googling around to solve this problem!! It’s probably an easy solution to it aswell.

I’m creating a really simple TableView app for the iPhone. It’s supposed to fetch an XML-document and parse it (already fixed) and then put the data into objects called HPobject!
One HPobject represents one day of data from the XML-file. Anyhow!

Then I want the object to be stored in a NSMutableArray so I can grab it later when I’m creating the table rows. But I can’t access it! My NSMutableArray is ALWAYS null! No matter what I do!

Here’s my code:

//THE .h FILE
#import "TBXML.h"
#import "HPobject.h"

@interface RootViewController : UITableViewController {
    NSMutableArray *listOfItems;
}

- (void)traverseElement:(TBXMLElement *)element;

//THE .m FILE
#import "RootViewController.h"
#import "HPobject.h"

@implementation RootViewController

- (void)viewDidLoad
{   
    NSMutableArray *listOfItems = [[NSMutableArray alloc] init];
    TBXML * tbxml = [[TBXML tbxmlWithURL:[NSURL URLWithString:@"http://www.hpprov.se/istasts.php?q=xxxxxxx"]] retain];

    if (tbxml.rootXMLElement)
        [self traverseElement:tbxml.rootXMLElement]; //Works fine!

    [tbxml release];
    [super viewDidLoad];
}

- (void) traverseElement:(TBXMLElement *)element {    
    do {
//Lots of parsing code which all works fine and gets me the variables up next!

            HPobject *currentObject = [[HPobject alloc] init];
            currentObject.antalRegistrerade = numRegistrerade;
            currentObject.inkomstBrutto = numBrutto;
            currentObject.inkomstNetto = numNetto;

            [listOfItems addObject:currentObject];

            NSLog(@"Array: %@", listOfItems); //RETURNS null!
            NSLog(@"Reg: %@, Net: %@, Brutt: %@", currentObject.antalRegistrerade, currentObject.inkomstNetto, currentObject.inkomstBrutto); //Returns the correct values!

            NSLog(@"%d stycken!", listOfItems.count); //Returns 0!! :(
            [currentObject release];

    } while ((element = element->nextSibling));  
}

Answer 1

You are defining listOfItems locally in viewDidLoad and then you try to access that in another method.

Make sure you are using an instance variable defined in your interface definition (header).

replace this line in viewDidLoad:

NSMutableArray *listOfItems = [[NSMutableArray alloc] init];

with

listOfItems = [[NSMutableArray alloc] init];