将object_setInstanceVariable（）转换为ARC？ [英] Converting object_setInstanceVariable() to ARC?

问题描述

我希望转换

object_setInstanceVariable(self, [key UTF8String], *(id**)addr);

到ARC。当我尝试使用Xcode内置的Objective-C ARC转换器时，我收到以下错误：

to ARC. When I try to use Xcode built-in Objective-C ARC converter I get the following error:

'object_setInstanceVariable'不可用：不可用在自动引用计数模式下

'object_setInstanceVariable' is unavailable: not available in automatic reference counting mode

我该如何处理这个问题？我知道我可以将--fno-objc-arc作为编译器标志，但我非常想使用ARC，如果可能的话（我有很多目标，否则我必须手动更改编译器标志） 。

How should I handle this problem? I know I can put --fno-objc-arc as Compiler flag, but I would very much like to use ARC instead, if it's possible (I have a lot of targets that I otherwise would have to manually change the Compiler flag for).

（该代码最初来自 NSObject + NSCoding和Mike Mayo在Rackspace移动应用程序中的存档

推荐答案

来源： https://developer.apple.com/library/ios/#documentation/Cocoa/参考/ ObjCRuntimeRef /参考/ reference.html

唯一的其他方法是：

void object_setIvar(id object, Ivar ivar, id value);

您需要事先获得 Ivar 值，可以通过 class_getInstanceVariable（Class class，char * name）获得。

You need the Ivar value beforehand, which can be obtained via class_getInstanceVariable(Class class, char* name).

总体而言，这将达到与之前，虽然现在与ARC兼容。

Overall this will achieve the same effect as before, whilst now being ARC compatible.

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