1、定义成员变量
@property (nonatomic, strong) UIImageView *navBarHairlineImageView;
2、创建findHairlineImageViewUnder方法，找到底部横线并在viewDidLoad中调用
- (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;
}
在viewDidLoad中调用
self.navBarHairlineImageView = [self findHairlineImageViewUnder:self.navigationController.navigationBar];
3、在viewWillAppear方法中隐藏该分割线
self.navBarHairlineImageView.hidden=YES;
4、在viewWillDisappear方法中显示该分割线
self.navBarHairlineImageView.hidden=NO;
