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;