NSString 实例将其类报告为 NSCFString [英] NSString instance reports its class as NSCFString

问题描述

我在这里的目标非常简单——我试图将一个 NSString 设置为一些测试数据，然后返回应该是 NSString 的类.这是我的代码:

My objective here is really simple -- I'm trying to set an NSString to some test data, then return the class, which should be NSString. Here's my code:

NSString* stringer = [NSString stringWithFormat: @"Test"];
NSLog(@"%@", [stringer class]);

日志说这个类是NSCFString，而不是NSString.这是怎么回事?

The log says that the class is NSCFString, not NSString. What's going on here?

推荐答案

NSString 实际上是一个用于不同类型字符串对象的容器类.通常，NSString 构造函数确实返回一个实际上是 NSCFString 类型的对象，它是 Core Foundation CFString 结构体的薄包装.

NSString is really a container class for different types of string objects. Generally an NSString constructor does return an object that is actually of type NSCFString, which is a thin wrapper around the Core Foundation CFString struct.

这篇关于NSString 实例将其类报告为 NSCFString的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！