objective C语言 NSDataWritingFileProtectionComplete in OS X

Question

查看文档:https://developer.apple.com/library/mac/文档/可可/引用/基金/类/NSData_Class/引用/Reference.html

我看到NSDataWritingFileProtectionComplete是"在OS X v10.8及更高版本中可用"，但当我试图在我的代码中使用它时，我有一个编译错误。检查NSData头，我发现这个功能只在iOS中可用:

NSDataWritingFileProtectionComplete NS_ENUM_AVAILABLE_IOS(4_0)

我做错了什么或文档是不正确的?

Answer 1

查看MacOS 10.8 SDK中定义的枚举，我看到:

typedef NS_OPTIONS(NSUInteger, NSDataWritingOptions) {
    NSDataWritingAtomic = 1UL << 0, // Hint to use auxiliary file when saving; equivalent to atomically:YES
    NSDataWritingWithoutOverwriting NS_ENUM_AVAILABLE(10_8, 6_0) = 1UL << 1, // Hint to return prevent overwriting an existing file. Cannot be combined with NSDataWritingAtomic.
    NSDataWritingFileProtectionNone NS_ENUM_AVAILABLE_IOS(4_0)                                  = 0x10000000,
    NSDataWritingFileProtectionComplete NS_ENUM_AVAILABLE_IOS(4_0)                              = 0x20000000,

" NS_ENUM_AVAILABLE_IOS "是一个展开为

的宏

 #define NS_ENUM_AVAILABLE_IOS(_ios) __OSX_AVAILABLE_STARTING(__MAC_NA, __IPHONE_##_ios)

"__MAC_NA"位表示"不适用"，这意味着文档当前是错误的。此功能仅在iOS中可用。