A handy category on NSIndexPath.

NSIndexPath+JRAdditions.m

@implementation NSIndexPath (JRAdditions)

- (NSIndexPath *) indexPathByAddingRows:(NSInteger)rows andSections:(NSInteger)sections {
    NSIndexPath *newIndexPath = [NSIndexPath indexPathForRow:MIN(NSIntegerMax, [self row] + rows)
                                                   inSection:MIN(NSIntegerMax, [self section] + sections)];
    return newIndexPath;
}

- (NSIndexPath *) indexPathByAddingRows:(NSInteger) rows {
    return [self indexPathByAddingRows:rows andSections:0];
}

- (NSIndexPath *) indexPathByAddingSections:(NSInteger) sections {
    return [self indexPathByAddingRows:0 andSections:sections];
}

- (NSIndexPath *) indexPathByRemovingRows:(NSInteger)rows andSections:(NSInteger)sections {
    NSIndexPath *newIndexPath = [NSIndexPath indexPathForRow:MAX(0, [self row] - rows)
                                                   inSection:MAX(0, [self section] - sections)];
    return newIndexPath;
}

- (NSIndexPath *) indexPathByRemovingRows:(NSInteger) rows {
    return [self indexPathByRemovingRows:rows andSections:0];
}

- (NSIndexPath *) indexPathByRemovingSections:(NSInteger) sections {
    return [self indexPathByRemovingRows:0 andSections:sections];
}


@end