左侧controller A隐藏导航条，推出右侧controller B显示导航条，类似这个效果：
实现步骤如下：
1. navigation controller中推入controller A，在controller A初始化阶段设置导航条隐藏：
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| - (void)viewDidLoad
{
[super viewDidLoad];
...
self.navigationController.navigationBarHidden = YES;
}
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2. controller B在viewWillAppear时设置navigationBar显示，viewWillDisappear中设置navigationBar隐藏，animated要为YES
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| - (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
[self.navigationController setNavigationBarHidden:YES animated:YES];
}
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3.如果controller B需要退出其他页面显示导航条，还需自行标记，使仅在back时切换显示/隐藏导航条
下面代码增加了pushingViewController标记，记录是否在推入下一级页面。非推入下一级页面的viewWillDisappear即为back，此时切换导航条为隐藏：
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| - (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
self.pushingViewController = NO;//显示前重置pushingViewController标记
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
if (!self.pushingViewController)
{
//不是推出下一级的viewWillDisappear（即back时）隐藏navigationBar
[self.navigationController setNavigationBarHidden:YES animated:YES];
}
}
- (void)pushOtherController
{
self.pushViewController = YES;//标记正在推入下一级页面
[self.navigationController pushViewController:viewController animated:YES];
}
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