Question

I have noticed, that even that my code is working great, something strange happen.

Assume I have two arrays: passwordEntered and tempPasswordEntered.

After I get a new passwordEntered, I do this each time:

 tempPasswordEntered=[passwordEntered mutableCopy]; 

Then I clean :

 [passwordEntered  removeAllObjects];

then, next time I again do this (for the new passwordEntered):

 tempPasswordEntered=[passwordEntered mutableCopy]; 

So tempPasswordEntered has only the last passwordEntered, and not both of them.
if first time it had 4 places in array,the second time it still has 4 places,
so my question is, does the copy REPLACE the array ? its not added to the last place of it as when you addObject ?

Another thing: should I use retain instead?

Answer 1

NSArray *retVal = [[NSArray alloc] initWithArray:fetchResults];
NSArray *retVal = [[NSArray alloc] initWithArray:[fetchResults copy]];
NSArray *retVal = [[NSArray alloc] initWithArray:[fetchResults retain]];

The latter two are simple leaks. The first is one way of making a copy, but retVal = [fetchResults copy]; is a better way to make a copy.

But, of course, you don’t need a copy at all. That isn’t the problem. You go on to say that the only thing that doesn’t crash is an empty result set.

That indicates one of two things; either your result set is corrupt (unlikely) or you are accessing the result set incorrectly (likely).