1.第一种方法
[[UINavigationBar appearance] setBackgroundImage:[[UIImage alloc] init] forBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault];
[[UINavigationBar appearance] setShadowImage:[[UIImage alloc] init]];
2.第二种方法
@interface BaseViewController (){
UIImageView *navBarHairlineImageView;
}
-
(void)viewDidLoad {
[super viewDidLoad];
navBarHairlineImageView = [self findHairlineImageViewUnder:self.navigationController.navigationBar];// Do any additional setup after loading the view from its nib.
} (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;
}(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
navBarHairlineImageView.hidden = YES;
}(void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
navBarHairlineImageView.hidden = NO;
}
