Release / dealloc标签栏视图控制器

Question

我已经使用nib文件分配了标签栏视图控制器，当我尝试释放标签视图控制器时，它不会调用任何视图控制器的dealloc功能。我发布如下：

[appDelegate.tabBarController.view removeFromSuperview];
NSMutableArray * vcs = [NSMutableArray arrayWithArray:[appDelegate.tabBarController viewControllers]];
[[vcs objectAtIndex:2] release]; //tried releasing both ways
[vcs removeObjectAtIndex:2];
[[vcs objectAtIndex:1] release];
[vcs removeObjectAtIndex:1];
[[vcs objectAtIndex:0] release];
[vcs removeObjectAtIndex:0];
[appDelegate.tabBarController setViewControllers:vcs];

请帮帮我。