NSInvocation和ARC(自动引用计数) [英] NSInvocation and ARC (Automatic Reference Counting)

问题描述

当尝试将当前代码迁移到ARC时，每当将NSString作为NSInvocation参数传递时，都会收到错误消息.

When trying to migrate my current code to ARC, I'm getting errors whenever I pass an NSString as an NSInvocation argument.

示例:

NSInvocation inv = ...;
NSString *one = @"Hello World!";
[inv setArgument:&one atIndex:2];

当我使用编辑"菜单中的重构->转换为Objective-C ARC"选项时，会发生错误.文本为"NSInvocation的setArgument不安全用于拥有所有权不是__unsafe_retained的对象."

The error happens when I use the Refactor -> Convert to Objective-C ARC option from the Edit menu. The text is "NSInvocation's setArgument is not safe to be used with an object with ownership other than __unsafe_retained."

我该如何解决?

推荐答案

这可能有效；

__unsafe_unretained NSString *one = @"Hello World";

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