Light content of uistatusbar affects the colour of uinavigation bar

Question

light content of uistatusbarstyle overlapped on navigationbart like this, anyone plz help on this this really giving head ache in login viewcontroller

                    HomeViewController *Home = [[HomeViewController alloc] initWithNibName:@"HomeViewController" bundle:nil];
                        UINavigationController *nav=[[UINavigationController alloc]initWithRootViewController:Home];
                        [self presentViewController:nav animated:YES completion:NULL];

in home viewcontroller

UINavigationBar *bar= [UINavigationBar appearance];
bar.backgroundColor=[UIColor redColor];

thanks in advance