iphone - NSString 字符串与字符串 VS @"string"

Question

我只是好奇，下面两个代码之间有什么区别吗？

NSString *aString = [NSString stringWithString:@"a string"];

NSString *aString = @"字符串";

我想知道当你采用后一种方式时到底发生了什么。

Answer 1

两者都指向在编译时创建的文字字符串。

即使 stringWithString 表明它是自动释放的，文字字符串也永远不会被释放。

在这里查看我的相关帖子:

Difference between NSString literals

来自苹果文档 @ https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/Strings/Articles/CreatingStrings.html

Such an object is created at compile time and exists throughout your program’s execution. The compiler makes such object constants unique on a per-module basis, and they’re never deallocated, though you can retain and release them as you do any other object.