UINavigationController先pop再push

UINavigationController先pop再push  

HXChatMsgViewController *chatMessage = [[HXChatMsgViewController alloc]initWithChatter:model.profile.userId isGroup:NO];
                    NSMutableArray *ViewCtr = [NSMutableArray arrayWithArray:self.navigationController.viewControllers];
                    NSLog(@"navigation viewControllers is %@", ViewCtr);
                    int index = (int)[ViewCtr indexOfObject:self];
                    [ViewCtr removeObjectAtIndex:index];
                    [ViewCtr addObject:chatMessage];
                    NSLog(@"the viewCtl is %@", ViewCtr);
                    [self.navigationController setViewControllers:ViewCtr animated:YES];