IOS7 navigatinBar色彩变化在popover

我开发了iPad应用程序.我在导航控制器的popover中打开一些屏幕.但是我没有在 IOS 7中更改导航控制台色调颜色.如何更改此颜色.感谢名单

UINavigationController *navigationController = [[[UINavigationController alloc] initWithRootViewController:airportsSearch] autorelease];
navigationController.navigationBar.barTintColor = [UIColor blackColor];
navigationController.navigationBar.translucent = NO;
self.popOver=[[UIPopoverController alloc] initWithContentViewController:navigationController];

self.popOver.delegate                    = self;
[self.popOver setPopoverContentSize:CGSizeMake(285,370)];

[self.popOver presentPopoverFromRect:tempButton.frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionLeft animated:YES];

navigationController.navigationBar.barStyle = UIBarStyleBlack;
navigationController.navigationBar.translucent = NO;

navigationController.navigationBar.barTintColor = [UIColor redColor];
navigationController.navigationBar.barStyle = UIBarStyleBlack;
navigationController.navigationBar.translucent = NO;