Storyboard + base localization + .strings file does not localize at runtime

(There are similar questions. Some resulted in answers that I've tried and found not to work. Others got no answers, I assume because the querents didn't supply as much detail as I'm about to.)

I started with a storyboard that worked well for my app; the strings it contains are in English. I wanted to add a French localization. I did this:

Added a base localization, which transferred MainStoryboard.storyboard from en.lproj to Base.lproj.
Added a French localization, which cloned InfoPlist.strings (English) and MainStoryboard.storyboard (Base) into fr.lproj.
Changed a couple of strings (titles of segments in a UISegmentedControl) in the French MainStoryboard.storyboard.
In the Simulator, set the language to French.
Ran the app from Xcode.

Result: This worked; my changed strings showed up in the running application.

But I want to be all fancy. I want to do the French localization using a .strings file. (It's not just a matter of being fancy; the French localization will be turned over to nontechnical translators, who can't be expected to master Interface Builder.) So:

Selected the base MainStoryboard.storyboard in the Xcode Project navigator.
In the File inspector, under Localization, changed the French localization from "Interface Builder Cocoa Touch Storyboard" to "Localizable Strings."
Accepted Xcode's warning that the French storyboard will be discarded in favor of a .strings file, which appears in the Assistant editor.
Made the same two edits; there's no question of their being the wrong strings, because they're all commented as IBUISegmentedControl...segmentTitles; and the label text doesn't appear anywhere else in the .strings file.
Deleted the existing (working) copy of the app from the simulator.
Ran the app.

Result: The view uses the base (originally English) localization, instead of loading the French strings.

This isn't satisfactory. I've tried deleting the app from the simulator, and even deleting the derived-data folder. The bug persists.

As I said, I can't turn a .storyboard file over to a nontechnical translator. How can I get iOS to accept the storyboard localizations from a .strings file?

Solution

I had the same problem with my UISegmentedControls. It turns out that there is a bug in iOS 6: .strings storyboard localization won't work on UISegmentedControl text and on UISearchBar placeholders. See this openradar: http://openradar.appspot.com/radar?id=2159402

Have you tried localizing other elements such as UILabels? That should work.