ios - 释放栈中的viewcontroller（在didReceiveMemoryWarning之后）

Question

我想在“内存警告”后删除堆栈中的所有视图控制器（Root 除外）以释放内存。

我在最后一个控制器中弹出ToRootViewController。

流程：Root(push)->AController(push)->BController(内存警告后返回)->Root

（在 BController 中）

- (void)didReceiveMemoryWarning {
    CMLog(@"BController");

    [super didReceiveMemoryWarning];

    CMLog(@"[allControllers lastObject]");
    [self.navigationController popToRootViewControllerAnimated:NO];
}

日志

1. 收到内存警告。
2. [RootViewController didReceiveMemoryWarning]
3. [AController didReceiveMemoryWarning]
4. [BController didReceiveMemoryWarning]
5. [BController didReceiveMemoryWarning]:[allControllers lastObject]
6. (popToRootViewControllerAnimated)

所以我重复这个过程

1. 收到内存警告。
2. [RootViewController didReceiveMemoryWarning]
3. [AController didReceiveMemoryWarning]
4. [BController didReceiveMemoryWarning]
5. [AController didReceiveMemoryWarning](<<<<重复)
6. [BController didReceiveMemoryWarning](<<<<重复)
7. [BController didReceiveMemoryWarning]:[allControllers lastObject]
8. (popToRootViewControllerAnimated)

多次尝试后应用程序崩溃，因为内存不足

我可以简单地删除堆栈中的视图控制器吗？并会释放内存？