NSArray *viewcontrollers=self.navigationController.viewControllers; if (viewcontrollers.count>1) {    if ([viewcontrollers objectAtIndex:viewcontrollers.count-1]==self) {        //push方式        [self.navigationController popViewControllerAnimated:YES];    }}else{    //present方式    [self.navigationController dismissViewControllerAnimated:YES completion:nil];} 通过presentviewcontroller的方式显示的viewcontroller不会存入self.navigationController.viewControllers数组中。而通过push方式显示的viewcontroller会存在该数组的最后。