//----push
    SecondViewController *secondVC = [[SecondViewController alloc] init];
    CATransition *transition  = [CATransition animation];
    transition.duration       = 0.25;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionDefault];
    transition.type           = kCATransitionPush;
    transition.subtype        = kCATransitionFromRight;
    transition.delegate       = self;
    [self.navigationController.view.layer addAnimation:transition forKey:nil];
    self.navigationController.navigationBarHidden = YES; //是否隐藏导航栏
    [self.navigationController pushViewController:secondVC animated:NO];
   
    //----pop
    CATransition *transition  = [CATransition animation];
    transition.duration       = 0.25;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionDefault];
    transition.type           = kCATransitionPush;
    transition.subtype        = kCATransitionFromBottom;
    transition.delegate       = self;
    [self.navigationController.view.layer addAnimation:transition forKey:nil];
    self.navigationController.navigationBarHidden = YES; //是否隐藏导航栏
    [self.navigationController popViewControllerAnimated:NO];