// 从左向右push
CATransition *transition = [CATransition animation];
transition.duration = 0.5f;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.delegate = self;
transition.type = @"push";
transition.subtype = kCATransitionFromLeft;
[self.navigationController.view.layer addAnimation:transition forKey:nil];
[self.navigationController pushViewController:vc animated:NO];
// 从右向左pop
CATransition *transition = [CATransition animation];
transition.duration = 0.5f;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.delegate = self;
transition.type = @"push";
transition.subtype = kCATransitionFromRight;
[self.navigationController.view.layer addAnimation:transition forKey:nil];
[self.navigationController popViewControllerAnimated:NO];
