Don't Move Table View Cells with a Long Press Gesture

I've completely implemented the UILongGesture in my App which exchanges the cell value by drag and drop. For now I've requirement that if I move first row with last row then first row should remain at first position means don't want change the position. I've tried chunk of codes and wasted my time but couldn't get result. Can anyone help me and yeah i'm new to developing iOS so please don't downvote me :) Thanks in advance help is highly appreciated. Below is my code.

- (IBAction)longPressGestureRecognized:(id)sender{

UILongPressGestureRecognizer *longGesture = (UILongPressGestureRecognizer *)sender;
UIGestureRecognizerState state = longGesture.state;
CGPoint location = [longGesture locationInView:self.tblTableView];
NSIndexPath *indexpath = [self.tblTableView indexPathForRowAtPoint:location];

static UIView *snapshotView = nil;
static NSIndexPath *sourceIndexPath = nil;

switch (state) {
    case UIGestureRecognizerStateBegan:
        if (indexpath) {
            sourceIndexPath = indexpath;
            UITableViewCell *cell = [self.tblTableView cellForRowAtIndexPath:indexpath];
            snapshotView = [self customSnapshotFromView:cell];
            __block CGPoint center = cell.center;
            snapshotView.center = center;
            snapshotView.alpha = 0.0;
            [self.tblTableView addSubview:snapshotView];
            [UIView animateWithDuration:0.25 animations:^{

                center.y = location.y;
                snapshotView.center = center;
                snapshotView.transform = CGAffineTransformMakeScale(1.05, 1.05);
                snapshotView.alpha = 0.98;

                cell.alpha = 0.0;

            } completion:^(BOOL finished) {
                cell.hidden = YES;
            }];
        }
        break;

    case UIGestureRecognizerStateChanged: {
        CGPoint center = snapshotView.center;
        center.y = location.y;
        snapshotView.center = center;

        if (indexpath && ![NSIndexPath isEqual:sourceIndexPath]) {

    [self.namesArray exchangeObjectAtIndex:indexpath.row withObjectAtIndex:sourceIndexPath.row];

            [self.tblTableView moveRowAtIndexPath:sourceIndexPath toIndexPath:indexpath];

            sourceIndexPath = indexpath;

            NSIndexPath *indexPathOfLastItem =[NSIndexPath indexPathForRow:([self.namesArray count] - 1) inSection:0];
            NSLog(@"last :::: %@",indexPathOfLastItem);

            if (indexpath==indexPathOfLastItem) {
                [self.namesArray exchangeObjectAtIndex:indexPathOfLastItem.row withObjectAtIndex:sourceIndexPath.row];
                [self.tblTableView moveRowAtIndexPath:indexPathOfLastItem toIndexPath:0];

                UITableViewCell *cell = [self.tblTableView cellForRowAtIndexPath:sourceIndexPath];
                cell.hidden = NO;
                cell.alpha = 0.0;
            }
        }

        else if (indexpath == 0){

            if ([sourceIndexPath isEqual:[self lastIndexPath]]) {

                NSIndexPath *indexPathOfLastItem =[NSIndexPath indexPathForRow:([self.namesArray count] - 1) inSection:0];
                NSLog(@"last :::: %@",indexPathOfLastItem);

                [self.namesArray exchangeObjectAtIndex:indexpath.row withObjectAtIndex:sourceIndexPath.row];

                [self.tblTableView moveRowAtIndexPath:indexPathOfLastItem toIndexPath:indexpath];

            }
        }
        break;
    }

    default: {
        UITableViewCell *cell = [self.tblTableView cellForRowAtIndexPath:sourceIndexPath];
        cell.hidden = NO;
        cell.alpha = 0.0;

        [UIView animateWithDuration:0.25 animations:^{

            snapshotView.center = cell.center;
            snapshotView.transform = CGAffineTransformIdentity;
            snapshotView.alpha = 0.0;
            cell.alpha = 1.0;

        } completion:^(BOOL finished) {

            sourceIndexPath = nil;
            [snapshotView removeFromSuperview];
            snapshotView = nil;

        }];

        break;
    }
}
}