ios - how to change height between UITableView and Navigation Bar -

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got uitableviewstylegroupedand uitableviewstyleplain changes in storyboard, found that, top edge of plain table view sticks navigation bar, while top gap in grouped style somehow because of header view.

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but, picture show, gap "a" bigger "b", why? there hidden elements around "a"? how manage gap stuck bar?

what's default size of gap "a" , "b"? how make "a" equal "b", "setting"

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below try-out

tried set heightforheaderinsection: , viewforheaderinsection: below

- (cgfloat)tableview:(uitableview *)tableview heightforheaderinsection:(nsinteger)section { return 0.0f; }  - (uiview *)tableview:(uitableview *)tableview viewforheaderinsection:(nsinteger)section { uiview * header = [[uiview alloc] init]; header.backgroundcolor = [uicolor redcolor]; [self.view addsubview:header];  return header; }

enter image description here

tried heightforfooterinsection: , viewforfooterinsection:, below

- (cgfloat)tableview:(uitableview *)tableview heightforfooterinsection:(nsinteger)section { return 0.0f; }  - (uiview *)tableview:(uitableview *)tableview viewforfooterinsection:(nsinteger)section { uiview * footer = [[uiview alloc] init]; footer.backgroundcolor = [uicolor yellowcolor]; [self.view addsubview:footer]; return footer; }

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it looks neither of them work expected, gap "a" there , not changed.

the weird is, height of header , footer still there, looks minium height,

even if setting height zero.

not sure why issue occurring, workaround grouped tableview "stuck" bottom of navigation bar:

cgfloat myinset = *height of gap a* self.tableview.contentinset = uiedgeinsetsmake(-myinset, 0, 0, 0);

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