这个主要是讲到mac系统底层的东西，，，，，，。。。。 Perfect for intermediate and expert developers wanting to take a deeper dive into advanced topics, CFHipsterRef: Low-Level Programming on iOS & Mac OS X covers the core technologies powering Cocoa, Objective-C, and the operating system itself, including:, Kernel, Objective-C Runtime, Clang, OSAtomic, Grand Central Dispatch, Inter-Process Communication, CoreServices, ImageI/O, Accelerate, Security, SystemConfiguration, International Components for Unicode, DictionaryServices, Xcode Toolchain, Third-Party Tools, CocoaPods Third-Party Tools, CocoaPods