导航栏下的线去掉
方法1:[self.navigationController.navigationBar setShadowImage:[[UIImage alloc] init]];
方法2:navBarHaierlineImageView = [HiddenNavBottomLine findHairlineImageViewUnder:self.navigationController.navigationBar];
tabbar上方的线去掉
[self.tabBarController.tabBar setShadowImage:[[UIImage alloc] init]];
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