iOS 隐藏导航栏下的黑线

一、找到导航栏下的黑线

// 寻找导航栏下的黑线

- (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;

}

二、调用函数找到黑线

// 找到黑线

UIImageView *navBarHairlineImageView = [self findHairlineImageViewUnder:self.navigationController.navigationBar];

三、隐藏和显示黑线

// 隐藏导航栏下的黑线

navBarHairlineImageView.hidden = YES;

// 显示导航栏下的黑线

navBarHairlineImageView.hidden = NO;