更改push时UIViewController出现的方式

 CATransition* transition = [CATransition animation];
 //改变视图控制器出现的方式
 transition.type = kCATransitionPush;           
 //改变视图控制器出现的位置
 transition.subtype = kCATransitionFromLeft;    
 [self.navigationController.view.layer addAnimation:transition forKey:kCATransition];
 [self.navigationController pushViewController:yourVC animated:NO];