优雅的隐藏导航条

2017-03-18

在项目开发过程中，有时需要隐藏系统的导航条，比如ControllerA跳到ControllerB，ControllerB再跳到ControllerC，其中ControllerB需要隐藏导航条，而A和C又要显示导航条。解决办法如下，既能保持系统原有的体验，又能满足上述需求。

在ControllerB中继承UIGestureRecognizerDelegate协议，在viewDidLoad中设置

= self;

1 2	``` 再实现以下方法：

(void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[self.navigationController setNavigationBarHidden:YES animated:YES];
}
-(void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
1
然后到ControllerA和ControllerC中实现以下方法：
(void)loadView
{
[super loadView];
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
[self.navigationController setNavigationBarHidden:NO animated:YES];
}
```
完成！