3D Touch Peek and Pop from UITableViewCell how to hand over data to other UIViewController?

Question

my app stores different attributes in Core Data objects. They are all shown in a UITableView, if you click a cell, a DetailView is shown. the usual stuff like in the Master-Detail-XCode-Template.

Now I want to implement 3D Touch with peek and pop. Like in the Mail app, 3D touch a cell, get preview, press deeper, pop in the detail.

I got this working so far, but I can t figure out how to pass the corresponding data in

- (nullable UIViewController *)previewingContext:(id <UIViewControllerPreviewing>)previewingContext viewControllerForLocation:(CGPoint)location

and

- (void)previewingContext:(id <UIViewControllerPreviewing>)previewingContext commitViewController:(UIViewController *)viewControllerToCommit

to the other DetailViewController.

If you just click the cell (no 3D touch) I hand over the data in

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
    NSManagedObject *object = [[self fetchedResultsController] objectAtIndexPath:indexPath];
    [[segue destinationViewController] setDetailItem:object];

I am using a

id detailItem

in every ViewController and I set the corresponding object to it.

So I try to get something similar to work, so in my DetailViewController my "detailItem" needs the corresponding Core Data object from the selected (3D touched) cell.

Thanks for help !

Answer 1

If you are using storyboard segues from the cell to the new view controller, the sender is the table view cell.

So you could implement prepareForSegue: as such:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if ([sender isKindOfClass:[UITableViewCell class]]) {

        UITableViewCell *cell = sender;
        NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];

        id viewController = segue.destinationViewController;

        // Get your data object
        // Pass it to the new view controller
    }
}