这些是数组文字,一种容器文字, Xcode 4.4及更高版本中的可用。
These are array literals, a type of container literal, available in Xcode 4.4 and later.
参见:
- "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