Open Radar

 
my bad -- apparently, the unwind action methods needs to be declared on the VC you're going back to (or perhaps in a protocol or category to reduce coupling). so, not a bug.


27-May-2013 02:31 PM Chris Adamson:
Summary:
While it is possible to set up an unwind segue on a cell in a UITableView, it does nothing useful: it does not unwind to the previous view controller, and sometimes doesn't even call its connected action or prepareForSegue:.

Steps to Reproduce:
Unzip the attached SelectAndUnwindBuglet Xcode project. It consists of the following storyboard:

-(initial-VC)->[navigation controller]-(root-VC)->[SNFViewController]-(segue)->[SNFPickControllerViewController]

The idea of this app is that the user will press a button to bring up the table VC (SNFPickControllerViewController), pick an item from the table, and be immediately returned to the first VC, with their pick indicated.

This is set up by connecting the table cell's selection to an unwind segue, pickAndUnwind:.

Expected Results:
I expect selecting a row to call prepareForSegue, then pickAndUnwind:, and then return to the previous view controller (using whatever transition got us here in the first place: modal, nav controller push, whatever)

Actual Results:
If the segue is of type "push", prepareForSegue:and pickAndUnwind: are called, but the segue is never actually unwound. In other words, we stay on the table VC.

If the segue is of type "modal", nothing happens at all.

Regression:

Notes:
Apparently, canPerformUnwindSegueAction:fromViewController:withSender: must return YES for even the "push" case to work.

27-May-2013 02:31 PM Chris Adamson:
'SelectAndUnwindBuglet.zip' was successfully uploaded

[OpenRadar readers: sample code at https://dl.dropboxusercontent.com/u/12216224/buglets/SelectAndUnwindBuglet.zip ]