ios - Foundation.framework是属于CoreService层还是CocoaTouch层？

Question

cocoa (触摸)文档 here说:

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

但是核心服务层文档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."

那么Foundation.framework属于哪一层。

Answer 1

Cocoa (Touch) 是层堆栈的包罗万象的保护伞。 Cocoa(触摸)应用程序层是该堆栈中的特定层，有时简称为应用程序层。

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

正如您提到的，here是Apple Documentation就这个主题而言。