ios - Why does an empty cell in UITableView has grey background on device but not on simulator? -

i created master-detail project core data in xcode 7 beta 3. when run on simulator (9.0) looks this:

but on device, iphone 6 8.4 looks this:

any ideas why?

i able fix manually setting background color on tableview.

self.tableview.backgroundcolor = uicolor.whitecolor()