声明属性：
/** 导航栏下面的横线 */
@property (nonatomic, strong) UIImageView *contentLineImageView;
代码：
-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
self.contentLineImageView.hidden = YES;
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
self.contentLineImageView.hidden = NO;
}
#pragma mark -- 去除导航栏下面的横线
- (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;
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor whiteColor];
self.contentLineImageView.hidden = YES;
self.contentLineImageView = [self findHairlineImageViewUnder:self.navigationController.navigationBar];
self.contentLineImageView = [[UIImageView alloc] init];
self.contentLineImageView = [self findHairlineImageViewUnder:self.navigationController.navigationBar];
}
