iOS去掉导航栏底部的线

1 UINavigationBar *navigationBar = self.navigationController.navigationBar;
2 // white.png图片自己下载个纯白色的色块，或者自己ps做一个
3 [navigationBar setBackgroundImage:[UIImage imageNamed:@"white.png"]
4                    forBarPosition:UIBarPositionAny
5                        barMetrics:UIBarMetricsDefault];
6 [navigationBar setShadowImage:[UIImage new]];

1 @implementation MyViewController {
2     UIImageView *navBarHairlineImageView;
3 }

1 navBarHairlineImageView = [self findHairlineImageViewUnder:navigationBar];

 1 - (UIImageView *)findHairlineImageViewUnder:(UIView *)view {
 2     if ([view isKindOfClass:UIImageView.class] && view.bounds.size.height <= 1.0) {
 3             return (UIImageView *)view;
 4     }
 5     for (UIView *subview in view.subviews) {
 6         UIImageView *imageView = [self findHairlineImageViewUnder:subview];
 7         if (imageView) {
 8             return imageView;
 9         }
10     }
11     return nil;
12 }

1 - (void)viewWillAppear:(BOOL)animated {
2     [super viewWillAppear:animated];
3     navBarHairlineImageView.hidden = YES;
4 }
5 
6 - (void)viewWillDisappear:(BOOL)animated {
7     [super viewWillDisappear:animated];
8     navBarHairlineImageView.hidden = NO;
9 }