navigationControllerse整平跳转

- (void)viewWillAppear:(BOOL)animated {   

 [self.navigationController setNavigationBarHidden:YESanimated:animated]; 

   [super view WillAppear:animated];

}

- (void)viewWillDisappear:(BOOL)animated {   
 [self.navigationController setNavigationBarHidden:NOanimated:animated];   
 [super viewWillDisappear:animated];
}