remove more than one object in array

NSMutableIndexSet *indexesToDelete = [NSMutableIndexSet indexSet];

        NSArray *deassMatches = [pickerArray valueForKey:eventstr.task_picker_id_str];

        for (int i =0; i<deassignArr.count; i++) {

            if ([deassMatches containsObject:[deassignArr objectAtIndex:i]])

            {

                NSUInteger indexvalue = [deassMatches indexOfObject:[deassignArr objectAtIndex:i]];

                [indexesToDelete addIndex:indexvalue];

            }

        }

        [pickerArray removeObjectsAtIndexes:indexesToDelete];

OR

NSMutableIndexSet *indexesToDelete = [NSMutableIndexSet indexSet];

NSUInteger currentIndex = 0;

for (id obj in yourArray) {

    //do stuff with obj

    if (shouldBeDeleted(obj)) {

        [indexesToDelete addIndex:currentIndex];

    }

    currentIndex++;

}

[yourArray removeObjectsAtIndexes:indexesToDelete];