关于iphone：奇怪的objective-c语法 – 方括号和@符号

Weird objective-c syntax - square brackets and @ sign

我在我的一个项目中使用ghsidebarnav，我遇到了分配对象数组的代码。我只是不知道它在做什么。它只是一个数组吗？这个奇怪的@[...]语法是什么？我以前没见过：

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NSArray *controllers = @[
@[
[[UINavigationController alloc] initWithRootViewController:[[GHRootViewController alloc] initWithTitle:@"Profile" withRevealBlock:revealBlock]]
],
@[
[[UINavigationController alloc] initWithRootViewController:[[GHRootViewController alloc] initWithTitle:@"News Feed" withRevealBlock:revealBlock]],
[[UINavigationController alloc] initWithRootViewController:[[GHMessagesViewController alloc] initWithTitle:@"Messages" withRevealBlock:revealBlock]],
[[UINavigationController alloc] initWithRootViewController:[[GHRootViewController alloc] initWithTitle:@"Nearby" withRevealBlock:revealBlock]],
[[UINavigationController alloc] initWithRootViewController:[[GHRootViewController alloc] initWithTitle:@"Events" withRevealBlock:revealBlock]],
[[UINavigationController alloc] initWithRootViewController:[[GHRootViewController alloc] initWithTitle:@"Friends" withRevealBlock:revealBlock]]
]
];