Question

I declared a NSArray object in .h file as

@property (nonatomic, assign) NSArray  *scnArray;

and in .h file under - (void)viewDidLoad I created three different NSArray objects as

NSArray  *obj1 = [[NSArray alloc] initWithObjects:@"1",@"0",@"0",nil];
NSArray  *obj2 = [[NSArray alloc] initWithObjects:@"0",@"3",@"0",nil];
NSArray  *obj3 = [[NSArray alloc] initWithObjects:@"0",@"0",@"5",nil];

scnArray = [[NSArray alloc] initWithArray:obj1];
[scnArray arrayByAddingObjectsFromArray:obj2];
[scnArray arrayByAddingObjectsFromArray:obj3];

and if I access this scnArray from any other function

NSArray *caseArray = [scnArray objectAtIndex:index];//index will be 0, 1, 2…

I am getting BAD_ACCESS_ERROR. What is the problem here and how can I correct to use it?

Answer 1

Try this :

NSArray  *obj1 = [[NSArray alloc] initWithObjects:@"1",@"0",@"0",nil];
NSArray  *obj2 = [[NSArray alloc] initWithObjects:@"0",@"3",@"0",nil];
NSArray  *obj3 = [[NSArray alloc] initWithObjects:@"0",@"0",@"5",nil];

scnArray = [[NSArray alloc] initWithArray:obj1];
scnArray = [scnArray arrayByAddingObjectsFromArray:obj2];
scnArray = [scnArray arrayByAddingObjectsFromArray:obj3];

The arrayByAddingObjectsFromArray: function adds all objects from array B to array A, and return the result (=the array containing both A’s and B’s elements).

So, you should simply GET that result… 🙂

IMPORTANT : scnArray MUST be an NSMutableArray array, and NOT an NSArray (it’s changing, right?); so make sure you edit that part too…

ALSO : NSArray *caseArray = [scnArray objectAtIndex:index]; – this doesn’t make any sense. Setting an array to an ELEMENT of the scnArray? It doesn’t contain arrays, right? It just contains ELEMENTS of those arrays (the ones we’ve added)…