How to test for an uninitialized mutable array

Question

I have corrupted a single object in a file. When I load in the file, one of my mutable arrays (1) contains another mutable array (2) (loaded from the same file) which is uninitialized. When I try to examine the array (2) with a for-in loop, I get: -[NSMutableArray count]: method sent to an uninitialized mutable array object"

I can get away with deleting array (2), but how do I test for it?

Using NSDocument.readFromData and NSKeyedUnarchiver.unarchiveObjectWithData, I retrieve an object (of type A) with a property of type NSMutableArray. That array contains a nested chain of objects of type A The problem object is a child of a child in that array. I think the problem object was damaged before I archived the data. — Carl Carlson
– Carl Carlson, Commented Jul 16, 2022 at 18:23

Carl Carlson · Accepted Answer · 2022-08-11 21:13:48Z

0

I used something like this:

NSString* name = [item.children className];
if ([name isEqualToString:   @"__NSPlaceholderArray" ])
{
    item.children = [[NSMutableArray alloc]init];
}
else...

answered Aug 11, 2022 at 21:13

Carl Carlson

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