Xcode ARC（自动引用计数），“发布不可用”
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Xcode ARC (automatic reference counting), "release is unavailable"
提问by cbbcbail
For my first time using Xcode I was following a tutorialonline. I did everything as the tutorialshowed me, but I am afraid that it's too outdated.
我第一次使用 Xcode 时，我正在学习在线教程。我按照教程向我展示的一切都做了，但我担心它太过时了。
The error I encounter is:
我遇到的错误是：
[font_attributes release];
'release' is unavailable: not available in automatic reference counting mode
ARC forbids explicit message send of 'release'
'release' 不可用：在自动引用计数模式下不可用
ARC 禁止“发布”的显式消息发送
My knowledge on Cocoa and Xcode is limited, but I still wish to expand my learning.
我对 Cocoa 和 Xcode 的了解有限，但我仍然希望扩展我的学习。
How may I fix the ARCissue?
我该如何解决这个ARC问题？
回答by Aleksander Azizi
The two options given by NJonesare valid and effective ways of dealing with ARCincompatibility. However, you do have a third option. Disabling ARCfor specificfiles.
NJones给出的两个选项是处理ARC不兼容问题的有效方法。但是，您确实有第三种选择。禁用ARC对特定文件。
Giving the flags -fno-objc-arcto your non ARCcompatible compile sources affectively marks them as such upon compilation.
-fno-objc-arc为不ARC兼容的编译源提供标志会在编译时有效地标记它们。
You can find your compile sources under Targets→ Your App→ Build Phases→ Compile Sources.
您可以在Targets→ Your App→ Build Phases→下找到您的编译源Compile Sources。
回答by NJones
You have two options:
您有两个选择：
1) Turn off ARC for this project. This is done by setting 'Objective-C Automatic Reference Counting'to NOin the 'Build Settings' tab of your target in the project page.
1) 关闭此项目的 ARC。这是通过在项目页面中目标的“构建设置”选项卡中将“Objective-C 自动引用计数”设置为NO来完成的。
2) Remove all retainreleaseautoreleaseNSAutoReleasePoolsand retainCountcalls, since ARC makes them for you. With the exception of NSAutoReleasePools They have been replaced by @autorelease{}.
2) 删除所有retainreleaseautoreleaseNSAutoReleasePools和retainCount调用，因为 ARC 为您制作它们。除NSAutoReleasePools外，它们已被 替换@autorelease{}。
The second option has been automated by apple see this question to use the refactoring tool.
第二个选项已被苹果自动化，请参阅此问题以使用重构工具。
