Question

I have the following variable in my .h file:

NSMutableArray *arr;

Then I have a method in implementation:

void aMethod
{
    if (something)
    {
        arr= [[NSMutableArray alloc] init];
    arr = [NSMutableArray arrayWithCapacity:0]; 
        [arr addObject:someObject];
    }

now if I try to access arr from any other method or even another if block within the same method, the app crashes and I can’t access that arr. For example:

  //same method:
  if (something else)
  {
       SomeObject *obj = [arr objectAtIndex:0]; //<---- it crashes on this line
  }

Any light guys?
Thanks in advance

Answer 1

There are 2 errors here:

1. You have a leak

   arr= [[NSMutableArray alloc] init]; //<–here

2. it crashes cause you’re creating autoreleased object and then try to access it when it is already deallocated:

   arr = [NSMutableArray arrayWithCapacity:0];

remove this line:

arr = [NSMutableArray arrayWithCapacity:0];