int index =(int)[[self.navigationController viewControllers]indexOfObject:self];
(index 本页面的标记,向前跳转的个数进行减少)
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:index-2] animated:YES];
int index =(int)[[self.navigationController viewControllers]indexOfObject:self];
(index 本页面的标记,向前跳转的个数进行减少)
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:index-2] animated:YES];