尽管标记了文件 -fno-objc-arc，但 ARC 禁止在结构或联合中使用 Objective-C 对象 [英] ARC forbids Objective-C objects in structs or unions despite marking the file -fno-objc-arc

问题描述

ARC 禁止在结构或联合中使用 Objective-C 对象，尽管标记了文件 -fno-objc-arc?为什么会这样?

ARC forbids Objective-C objects in structs or unions despite marking the file -fno-objc-arc? Why is this so?

我假设如果你标记它 -fno-objc-arc 你没有这个限制.

I had the assumption that if you mark it -fno-objc-arc you don't have this restriction.

推荐答案

如果您收到此消息，请尝试 __unsafe_unretained.只有在结构中的对象未被保留时，它才是安全的.示例:如果您将 OpenFeint 与 ARC 一起使用，则 OFBragDelegateStrings 类会在结构中显示此错误.

If you got this message try __unsafe_unretained. It is only safe, if the objects in the struct are unretained. Example: If you use OpenFeint with ARC the Class OFBragDelegateStrings says this error in a struct.

typedef struct OFBragDelegateStrings
{
     NSString* prepopulatedText;
     NSString* originalMessage;
} OFBragDelegateStrings;

到

typedef struct OFBragDelegateStrings
{
     __unsafe_unretained NSString* prepopulatedText;
     __unsafe_unretained NSString* originalMessage;
} OFBragDelegateStrings;

这篇关于尽管标记了文件 -fno-objc-arc，但 ARC 禁止在结构或联合中使用 Objective-C 对象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！