Foundation.framework是否属于CoreService层或CocoaTouch层？

Question

可可（触摸）文件here说：

Cocoa Touch, which includes Foundation and UIKit frameworks, is used for developing applications that run on iOS. 

但核心服务层文件here说：

The Core Services layer contains fundamental system services for apps. Key among these services are the Core Foundation and Foundation frameworks, which define the basic types that all apps use. This layer also contains individual technologies to support features such as location, iCloud, social media, and networking." 

因此，这层Foundation.framework是属于。

Answer 1

可可（Touch）是层叠叠的全方位保护伞。可可（触摸）应用层是该堆栈中的特定层，有时简称为应用层。

Core Foundation框架和Foundation框架都是Core Services层的一部分。

正如您所提到的，here是关于这个主题的Apple Documentation。