iOS去除导航栏和tabbar的横线

导航
[self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
[self.navigationController.navigationBar setShadowImage:[UIImage new]];

导航透明设置

　 [self.navigationController.navigationBar setTranslucent:NO];

tab

[self.tabBarController.tabBar setBackgroundImage:[UIImage new]];
[self.tabBarController.tabBar setShadowImage:[UIImage new]];