本文介绍了奇怪的objective-c语法 - 方括号和@符号的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在我的一个项目中使用GHSidebarNav，我遇到了这个代码，分配了一个对象数组。我只是不知道它在做什么。它只是一个阵列吗？什么是奇怪的 @ [...] 语法？我之前没见过：
I'm using GHSidebarNav in one of my projects and I came across this code allocating an array of objects. I just have no idea what its doing. Is it just an array? What is this weird @[...] syntax? I have not seen that before:
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]]
]
];
推荐答案
这些是数组文字，一种容器文字， Xcode 4.4及更高版本中的。
These are array literals, a type of container literal, available in Xcode 4.4 and later.
参见：
- 讨论
- WWDC 2012 ，大约需要19-20分钟
- WWDC 2012
- "Literal syntax" section of the discussion of arrays in the Programming with Objective C
- Objective-C Literals discussion at the LLVM site
- WWDC 2012 Modern Objective-C, about 19-20 minutes into it
- WWDC 2012 Migrating to Modern Objective-C
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