push的动画效果

CATransition *animation=[CATransition animation];
    animation.delegate=self;
    animation.duration=0.3;
    animation.type = kCATransitionPush;
    animation.subtype = kCATransitionFromLeft;
    [self.navigationController.view.layer addAnimation:animation forKey:@"animation"];
    [self.navigationController pushViewController:_doubanActivity animated:NO];