去掉导航栏下细线

 1     //去除bar下方 线
 2     if ([self.navigationController.navigationBar respondsToSelector:@selector( setBackgroundImage:forBarMetrics:)]){
 3         NSArray *list=self.navigationController.navigationBar.subviews;
 4         for (id obj in list) {
 5             if ([obj isKindOfClass:[UIImageView class]]) {
 6                 UIImageView *imageView=(UIImageView *)obj;
 7                 NSArray *list2=imageView.subviews;
 8                 for (id obj2 in list2) {
 9                     if ([obj2 isKindOfClass:[UIImageView class]]) {
10                         UIImageView *imageView2=(UIImageView *)obj2;
11                         imageView2.hidden=YES;
12                     }
13                 }
14             }
15         }
16     }

2、iOS10出来之后，@"_UINavigationBarBackground" 变成了@"_UIBarBackground"，代码改成这样：

#define iOS10 ([[UIDevice currentDevice].systemVersion intValue]>=10?YES:NO)
- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];

    [self.navigationController.navigationBar.subviews enumerateObjectsUsingBlock:^(UIView *view, NSUInteger idx, BOOL *stop) {
        if (iOS10) {
            //iOS10,改变了导航栏的私有接口为_UIBarBackground
            if ([view isKindOfClass:NSClassFromString(@"_UIBarBackground")]) {

                [view.subviews firstObject].hidden = YES;
            }
        }else{
            //iOS10之前使用的是_UINavigationBarBackground
            if ([view isKindOfClass:NSClassFromString(@"_UINavigationBarBackground")]) {

                [view.subviews firstObject].hidden = YES;
            }
        }
    }];
}








可不可以精简一下呢：

如果设置了
[UINavigationBar appearance].translucent = NO;

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];

    self.navigationController.navigationBar.subviews[0].subviews[0].hidden = YES;
}
否则

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];

    self.navigationController.navigationBar.subviews[0].subviews[1].hidden = YES;
}

让明天，不后悔今天的所作所为

去掉导航栏下 细线

去掉导航栏下细线