在有tabbarcontroller时，A界面push到B界面想隐藏底部tabbar，从B界面返回A后再显示tabbar。那么在控制器A中可以设置
-(void)clickTheSettingBtn{
ControllerB *vcB = [[ControllerB alloc]init];
//在跳转之前设置为YES
self.hidesBottomBarWhenPushed = YES;
[self.navigationController pushViewController:vcB animated:YES];
//在跳转之后再设置为NO
self.hidesBottomBarWhenPushed = NO;
}
原文：http://www.cnblogs.com/Apologize/p/5584869.html