NSString 和 CFString 完全一样吗? [英] NSString is exactly the same as CFString?

问题描述

O'Reilly's Programming iOS 5 说(也许在更宽松的意义上)，NSString 是一个 CFString".但是，是否至少 NSString * 会指向某个带有 isa 的内存块，而 CFStringRef 可能不会?

解决方案

不完全一样；它们是免费桥接.这个 Apple Doc 应该更详细地解释.>

这里有关于 Google 图书.

O'Reilly's Programming iOS 5 says (maybe in a looser sense), that "an NSString is a CFString". But is it true that at least NSString * will point to some memory chunk with an isa, while CFStringRef probably does not?

解决方案

Not exactly the same; they are Toll-Free Bridged. This Apple Doc should explain in more detail.

Here is even more detail from iOS 5 Programming Pushing The Limits on Google Books.

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