use this
-(void)viewWillAppear:(BOOL)animated
{
[self.navigationController setNavigationBarHidden:YES animated:animated];
[self setHidesBottomBarWhenPushed:YES];
[super viewWillApper:animated];
}
enter code here
-(void)viewWillDisappear:(BOOL)animated
{
[self.navigationController setNavigationBarHidden:NO animated:animated];
[self setHidesBottomBarWhenPushed:NO];
[super viewWillDisapper:animated];
}