pop/present

文章为转载， 原文地址  ： https://www.jianshu.com/p/4bdbaa7bed5e

方法一：通过判断self有没有present方式显示的父视图presentingViewController

-(IBAction)dismiss:(id)sender{if(self.presentingViewController){[selfdismissViewControllerAnimated:YES completion:nil];}else{[self.navigationController popViewControllerAnimated:YES];}}

方法二：

通过判断self.navigationController.viewControllers的最后一个是否是当前控制器，或者self.navigationController.topViewController == self

-(IBAction)dismiss:(id)sender{if(self.navigationController.topViewController==self){[self.navigationController popViewControllerAnimated:YES];}else{[selfdismissViewControllerAnimated:YES completion:nil];}