Reorder/move UITableViewCell but moves back - ios

Question

I want to implement a method to be able to reorder the rows of a tableview.
In each section i only have one row. When the editing-state of the tableview is enabled, the move indicators appear as expacted. But when i drag one of the cell to another position, the cell immediatly (after approximatly 1 s) pops back to the original position. This is weired to me, because i implemented such a reorder functionality already. The difference between those two projects are that the new project implements a bunch of gesture recognizers (eg UILongPressGestureRecognizer, UIPanGestureRecognizer, UIPinchGestureRecognizer,..). I already thought about the possibility that one of the gesture recognizers is blocking the drag action of the tableviewcell but its not.
You can see the code below:
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
return YES;
}
- (NSIndexPath *)tableView:(UITableView *)tableView targetIndexPathForMoveFromRowAtIndexPath:(NSIndexPath *)sourceIndexPath toProposedIndexPath:(NSIndexPath *)proposedDestinationIndexPath {
//return [NSIndexPath indexPathForRow:0 inSection:3];
return nil;
}
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath {
NSLog(#"%#", destinationIndexPath);
}
Can anyone help me pls?
UPDATE:
I found out that the moved tableviewcell is beeing moved to the original destination index path. Does that indicate, that a reloadData on the table view has happened?
2nd UPDATE:
Because it was menthioned by Andrei Shender why i return nil in the tableView:targetIndexPathForMoveFromRowAtIndexPath:toProposedIndexPath: method you can find my updated code below.
- (NSIndexPath *)tableView:(UITableView *)tableView targetIndexPathForMoveFromRowAtIndexPath:(NSIndexPath *)sourceIndexPath toProposedIndexPath:(NSIndexPath *)proposedDestinationIndexPath {
return proposedDestinationIndexPath;
//for testing purpose only
//return nil;
}
Btw when changing my code, i found out, that this method never gets called. Regarding to Apples documents about reordering tableviewcells it should get called.

Answer 1

Thanks to this posting I figured out, what the problem was. Combining a UIPanGestureRecognizer and a UITableView with the reorder/move funcationality is a tricky thing.
When i edit the tableview, i remove the gesture recognizer (of the viewcontroller's view) and when the editing is disabled again, i add the gesture recognizer again.

Answer 2

Be sure to update your data source in the method :
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath