Objective-C:ARC禁止显式发送“保留"消息 [英] Objective-C: ARC forbids explicit message send of 'retain'

问题描述

我是Objective-C的新手，我尝试将用Objective-C的较旧版本编写的旧Objective-C项目移植到新项目，但出现以下编译器错误:

I'm new to Objective-C, I try to port an old Objective-C project written in an older version of Objective-C to the new one, but I'm getting the following compiler error:

ARC forbids explicit message send of 'retain'

in 
color = [aColor retain];
or 
color = [[NSColor blackColor] retain];

我正在阅读有关clang现在正在使用的新自动引用计数的信息.
我也尝试过使用Xcode的重构功能，但是没有运气... 需要替换此旧代码的正确的Objective-C代码是什么?

I was reading about the new automatic reference counting that clang is using now.
I have also tried to use Xcode's refactor function but with no luck... What is the proper Objective-C code that need to replace this old code?

推荐答案

简单地:

color = [NSColor blackColor];

ARC将管理对象的生存期，因此您不再需要release，retain或autorelease.

ARC will manage the lifetime of your objects so you don't need release, retain or autorelease any longer.

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