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

Question

这里的可可（触摸）文档说：

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

但是这里的核心服务层文档说：

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）应用层是该堆栈中的一个特定层，有时简称为应用层。

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

正如您所提到的，这里是有关该主题的Apple 文档。