去掉导航栏分割线 和 设置导航栏的背景颜色

 1  // 去掉导航栏下面的 分割线
 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     }
17 
18 
19 
20  self.automaticallyAdjustsScrollViewInsets = NO;
21     self.edgesForExtendedLayout = UIRectEdgeTop; // 顶部开始
22     self.navigationController.navigationBar.translucent  = YES; // 导航栏透明
23     [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"barpic1"] forBarMetrics:UIBarMetricsDefault]; // 添加背景颜色（图片）（主要的 如果要把导航栏设置成透明的··用一张透明的图片就好了）
24     //设置导航栏文字为白色
25     self.navigationController.navigationBar.titleTextAttributes=[NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor],UITextAttributeTextColor, nil];
26     //设置后退按钮为白色
27     [self.navigationController.navigationBar setTintColor:[UIColor whiteColor]];
28     //设置后退按钮统一为返回
29     UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStylePlain target:nil action:nil];
30     self.navigationItem.backBarButtonItem = item;