隐藏导航栏UINavigationBar底部黑线

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全局隐藏

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[[UINavigationBar appearance]  setBackgroundImage:[[UIImage alloc] init] forBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault];
[[UINavigationBar appearance] setShadowImage:[[UIImage alloc] init]];

或者

[UINavigationBar appearance].clipsToBounds = YES;

局部隐藏

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

或者

self.navigationController.navigationBar.clipsToBounds=YES;