[[UINavigationBar appearance] setBackgroundImage:[[UIImage alloc] init] forBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault]; [[UINavigationBar appearance] setShadowImage:[[UIImage alloc] init]];
[self.navigationController.navigationBar setBackgroundImage:nil forBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.clipsToBounds = YES;
self.navigationController.navigationBar.shadowImage = [UIImage new];
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