uistoryboard - Xcode Storyboard preview size classes blank -

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i have problem storyboard preview. when select old viewcontroller created previous version of xcode (6.0), preview show me navigation bar. but, if create new viewcontroller , put inside elements, preview works. current version of xcode 6.3.2.

thanks

the interface elements put inside "old viewcontroller" added under particular size class. not in size class preview, interface elements not present.


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