NSMutableArray removeObjectAtIndex:indexPath.row crashes - iphone

Question

I have a UITableViewController with an NSMutableArray in the header like this:
NSMutableArray *someArray;
Also I have the property declared:
#property (nonatomic, retain) NSMutableArray *someArray;
In the .m file I load the array in the method:
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
someArray = [[NSMutableArray alloc] init];
[self loadArrayData];
[tableview reloadData];
}
The table populates great, adding is no problem, but when I try to delete a row, the app crashes on the following line:
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
[someArray removeObjectAtIndex:indexPath.row];
//update table etc..
If I use the debugger, I can see the array has some objects, and when I Log indexPath.row I get a value which is inside the array size.
I don't understand why it is crashing on this line... Who can help me?
The console outputs:
* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayI removeObjectAtIndex:]: unrecognized selector sent to instance 0x6193890'

Answer 1

I had a very similar problem and I was initiating my array with CoreData like this:
self.allContacts = (NSMutableArray*)[cdc.managedObjectContext executeFetchRequest:fetchRequest error:&error];
trying to cast the result from CoreDataController fetch request to NSMutableArray.
Turns out I need the function called "mutableCopy" at the end of fetch request.
self.allContacts = (NSMutableArray*)[[cdc.managedObjectContext executeFetchRequest:fetchRequest error:&error] mutableCopy];
I don't think cast to (MutableArray *) is required but I have it just in case.
Hope this helps.

Answer 2

I had the same issue a week back. What I did was this:
Declared a NSMutableArray* globalArray as a global within the same tableViewController.m implementation file. Then inside
if (editingStyle == UITableViewCellEditingStyleDelete) {
globalArray = [[NSMutableArray alloc] initWithArray:someArray];
[globalArray removeObjectAtIndex:[indexPath row]];
}
And then I copied back this globalArray into someArray before the reloadData call. Works.

Answer 3

not sure if that cause one of your issues, but if you have property for someArray then use self.someArray instead of just someArray .
Of course that after using self, you should auto release it like this :
self.someArray = [[[NSMutableArray
alloc] init] autorelease];
(call this inside your viewController
init method)
then try to :
[self.someArray removeObjectAtIndex:indexPath.row];
2.
try to call [self loadArrayData]; inside viewDidLoad.
It should be called prior to cellForRowAtIndexPath, and that way you won't need to call reloadData
if that still won't help, then post the code of loadArrayData