Cool long press gesture using CGAffineTransformMakeScale simulate moving tv cells up or down in a UITableView

longPressGestureForUITableViews.m

#pragma mark - Long press to move cells up and down


- (IBAction)longPressGestureRecognized:(id)sender {
    
    UILongPressGestureRecognizer *longPress = (UILongPressGestureRecognizer *)sender;
    UIGestureRecognizerState state = longPress.state;
    
    CGPoint location = [longPress locationInView:self.tableView];
    NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:location];
    
    static UIView       *snapshot = nil;        ///< A snapshot of the row user is moving.
    static NSIndexPath  *sourceIndexPath = nil; ///< Initial index path, where gesture begins.
    
    switch (state) {
        case UIGestureRecognizerStateBegan: {
            if (indexPath) {
                sourceIndexPath = indexPath;
                
                UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];
                
                // Take a snapshot of the selected row using helper method.
                snapshot = [self customSnapshoFromView:cell];
                
                // Add the snapshot as subview, centered at cell's center...
                __block CGPoint center = cell.center;
                snapshot.center = center;
                snapshot.alpha = 0.0;
                [self.tableView addSubview:snapshot];
                [UIView animateWithDuration:0.25 animations:^{
                    
                    // Offset for gesture location.
                    center.y = location.y;
                    snapshot.center = center;
                    snapshot.transform = CGAffineTransformMakeScale(1.05, 1.05);
                    snapshot.alpha = 0.98;
                    cell.alpha = 0.0;
                    cell.hidden = YES;
                    
                }];
            }
            break;
        }
            
        case UIGestureRecognizerStateChanged: {
            CGPoint center = snapshot.center;
            center.y = location.y;
            snapshot.center = center;
            
            // Is destination valid and is it different from source?
            if (indexPath && ![indexPath isEqual:sourceIndexPath]) {
                
                // ... update data source.
                [self.wishListData exchangeObjectAtIndex:indexPath.row withObjectAtIndex:sourceIndexPath.row];
                
                // ... move the rows.
                [self.tableView moveRowAtIndexPath:sourceIndexPath toIndexPath:indexPath];
                
                // ... and update source so it is in sync with UI changes.
                sourceIndexPath = indexPath;
                
                // save the new order of the list
                NSMutableArray *myList = self.wishListData;
                
                
                int i = 0;
                for (NSManagedObject *mo in myList)
                {
                    [mo setValue:[NSNumber numberWithInt:i++] forKey:@"displayOrder"];
                }
                
                [managedObjectContext save:nil];
                
                [[CoreDataController sharedInstance] saveMasterContext];
            }
            break;
        }
            
        default: {
            // Clean up.
            UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:sourceIndexPath];
            cell.alpha = 0.0;
            
            [UIView animateWithDuration:0.25 animations:^{
                
                snapshot.center = cell.center;
                snapshot.transform = CGAffineTransformIdentity;
                snapshot.alpha = 0.0;
                cell.alpha = 1.0;
                
            } completion:^(BOOL finished) {
                
                cell.hidden = NO;
                sourceIndexPath = nil;
                [snapshot removeFromSuperview];
                snapshot = nil;
                
            }];
            
            break;
        }
    }
}