iOS 隐藏导航栏底部线的两种方法

第一种：

  这三行代码写在viewdidload 里面

//    UINavigationBar *navigationBar = self.navigationController.navigationBar;

//    navigationBar.backgroundColor =  [UIColor getColor:@"#f8f8f8"];

//    self.navBarHairlineImageView = [self findHairlineImageViewUnder:navigationBar];

//- (void)viewWillAppear:(BOOL)animated {

//    [super viewWillAppear:animated];

//    self.navBarHairlineImageView.hidden = YES;

//}

//

//- (void)viewWillDisappear:(BOOL)animated {

//    [super viewWillDisappear:animated];

//    self.navBarHairlineImageView.hidden = NO;

//}

//

//- (UIImageView *)findHairlineImageViewUnder:(UIView *)view {

//    if ([view isKindOfClass:UIImageView.class] && view.bounds.size.height <= 1.0) {

//        return (UIImageView *)view;

//    }

//    for (UIView *subview in view.subviews) {

//        UIImageView *imageView = [self findHairlineImageViewUnder:subview];

//        if (imageView) {

//            return imageView;

//        }

//    }

//    return nil;

//}

第二种方法：

    [self.navigationController.navigationBarsetBackgroundImage:[UIImagenew] forBarMetrics:UIBarMetricsDefault];

    self.navigationController.navigationBar.shadowImage = [[UIImage alloc]init];