隐藏导航栏最底下的线条

两种方法可以实现隐藏导航栏最底下的线条

方法1:使用图片或颜色设置

void)viewWillAppear:(BOOL)animated{
    
    // Called when the view is about to made visible. Default does nothing    
    [super viewWillAppear:animated];
  
    //去除导航栏下方的横线
    [navigationBar setBackgroundImage:[UIImage imageWithColor:[self colorFromHexRGB:@"33cccc"]]
                       forBarPosition:UIBarPositionAny
                           barMetrics:UIBarMetricsDefault];
    [navigationBar setShadowImage:[UIImage new]];

}

方法2:使用nav自带的方法

self.navigationController.navigationBar.clipsToBounds=YES;