Verify that dataSet is an NSMutableArray. The exception is getting thrown because it doesn't respond to removeObjectAtIndex.
jdot
2010-07-12 17:53:46
+2
A:
Mumble, it is not a NSMutableArray, but:@interface ListOfVideo : UITableViewController <NSFetchedResultsControllerDelegate> { NSMutableArray *dataSet;}@property (nonatomic, retain) NSMutableArray *dataSet;...// In the .m file@synthesize dataSet;
IssamTP
2010-07-12 19:42:33
The property being for a mutable array doesn't make the array magically become mutable.
Joshua Weinberg
2010-07-12 21:33:51
+2
A:
Your NewsFetcher returns you an immutable array, not a mutable instance. Use the following instead for initialization:
NSArray *results = [[NewsFetcher sharedInstance]
fetchManagedObjectsForEntity:@"News"
withPredicate:predicate
withDescriptor:@"Titolo"];
dataSet = [results mutableCopy];
An expression like A *a = (A*)b; only casts the pointer to a different type - it doesn't convert/change the actual type of the instance it points to.
Georg Fritzsche
2010-07-12 22:40:33