参考文章
方法一：
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
if (_navBarHairlineImageView == nil) {
_navBarHairlineImageView = [self findHairlineImageViewUnder:self.navigationBar];
}
_navBarHairlineImageView.hidden = YES;
}
//通过一个方法来找到这个黑线(findHairlineImageViewUnder):
- (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;
}
// 同样的在界面出现时候开启隐
-(void)viewWillAppear:(BOOL)animated {
navBarHairlineImageView.hidden = YES;
}
//在页面消失的时候就让出现
-(void)viewWillAppear:(BOOL)animated
{
navBarHairlineImageView.hidden = NO;
}
方法二：
//在页面出现的时候就将黑线隐藏起来
-(void)viewWillAppear:(BOOL)animated
{
[self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
[self.navigationController.navigationBar setShadowImage:[UIImage new]];
}
//在页面消失的时候就让navigationbar还原样式
-(void)viewWillDisappear:(BOOL)animated{
[self.navigationController.navigationBar setBackgroundImage:nil forBarMetrics:UIBarMetricsDefault];
[self.navigationController.navigationBar setShadowImage:nil];
}
