隐藏导航栏
self.navigationController.navigationBarHidden = NO;
把导航栏返回功能按钮 名称和功能
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"<返回" style:UIBarButtonItemStylePlain target:self action:@selector(backAction:)];
设置导航栏的颜色 导航那一条的颜色
self.navigationController.navigationBar.tintColor = [UIColor colorWithRed:3/255.f green:205/255.f blue:134/255.f alpha:1];
设置导航栏的背景 置为空
[self.navigationController.navigationBar setBackgroundImage:[UIImage alloc] forBarMetrics:UIBarMetricsDefault];
设置导航栏的下划线颜色
self.navigationController.navigationBar.shadowImage = [[UIImage alloc]init];
导航栏变透明
self.navigationController.navigationBar.translucent = YES;