//设置导航栏的标题
self.navigationBar.title = @"CZFirstVC";

//设置导航栏左边的按钮
UIButton *leftButton = [[UIButton alloc] initWithFrame:CGRectZero];
[leftButton setTitle:@"客服" forState:UIControlStateNormal];
leftButton.titleLabel.font = [UIFont systemFontOfSize:14];
[leftButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[leftButton sizeToFit];
self.navigationBar.leftButton = leftButton;

//设置导航栏右边的按钮
UIButton *rightButton = [[UIButton alloc] initWithFrame:CGRectZero];
[rightButton setImage:[UIImage imageNamed:@"gouwudai"] forState:UIControlStateNormal];
[rightButton sizeToFit];
[rightButton addTarget:self action:@selector(rightButtonAction) forControlEvents:UIControlEventTouchUpInside];
self.navigationBar.rightButton = rightButton;

//导航栏的隐藏状态
BOOL isHidden = self.navigationBarHidden;

//以动画的方式隐藏导航栏
[self setNavigationBarHidden:YES animated:YES];
//或者 直接隐藏导航栏，没有动画
self.navigationBarHidden = YES;

//禁用pop交互手势
CZNavigationController *navVC = (CZNavigationController *)self.navigationController;
navVC.enablePopGesture = NO;

//你可以重写vc的这个方法来监听当前控制器的返回操作
- (void)willBePopped {
    NSLog(@"将要pop返回上一个界面。。。");
}

//设置导航栏背景颜色
self.navigationBar.backgroundView.backgroundColor = [UIColor orangeColor];

//显示navBar底部线条,默认是隐藏的
self.navigationBar.line.hidden = NO;