复制粘贴之去iOS导航栏黑线

去掉导航栏的边界黑线

方法1：
[self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage = [[UIImage alloc] init];

方法2：
  if ([self.navigationController.navigationBar respondsToSelector:@selector( setBackgroundImage:forBarMetrics:)]){
    NSArray *list=self.navigationController.navigationBar.subviews;
    for (id obj in list) {
        if ([obj isKindOfClass:[UIImageView class]]) {
            UIImageView *imageView=(UIImageView *)obj;
            NSArray *list2=imageView.subviews;
            for (id obj2 in list2) {
                if ([obj2 isKindOfClass:[UIImageView class]]) {
                    UIImageView *imageView2=(UIImageView *)obj2;
                    imageView2.hidden=YES;
                }
            }
        }
    }
}

去掉搜索框的边界黑线

代码：
 [self.textSearchBar setBackgroundImage:[[UIImage alloc] init]];

Stroryboard：
选中搜索框——右边in attribute inspector——View 在Tint的颜色栏中选择 clear color