如何知道我的 Xcode iPhone 项目是否使用 ARC？
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How to know if my Xcode iPhone project is using ARC?
提问by Steven Fisher
I want to know if my Xcode iPhone project is using ARC, and I can't remember if I ticked that box when creating the project.
我想知道我的 Xcode iPhone 项目是否正在使用 ARC，我不记得我在创建项目时是否勾选了那个框。
How can I get this information?
我怎样才能得到这些信息？
回答by Steven Fisher
Select your project, then Build Settings. Look for Objective-C Automatic Reference Countingin the Apple LLVM Compiler - Languagesection. Make sure you select the target; while you can set this in the project, the target can override it.
选择您的项目，然后选择Build Settings。在Apple LLVM 编译器 - 语言部分查找Objective-C 自动引用计数。确保你选择了目标；虽然您可以在项目中设置它，但目标可以覆盖它。
(You can also use the search bar in Build Settings for OBJC_ARC.)
（您也可以使用 Build Settings 中的搜索栏OBJC_ARC。）
Keep in mind, too, that you can turn ARC on or off on a per file basis in build phases.
还要记住，您可以在构建阶段基于每个文件打开或关闭 ARC。
Or, just try something like this in code:
或者，在代码中尝试这样的事情：
[[[NSObject alloc] init] autorelease]
If you get an error:
如果出现错误：
ARC forbids explicit message send of 'autorelease'
Then you're using ARC.
那么你正在使用ARC。
You can also require ARC from a source code file by checking for it:
您还可以通过检查源代码文件中的 ARC 来要求它：
#if !__has_feature(objc_arc)
#error This file must be built with ARC.
// You can turn on ARC for only this file by adding -fobjc-arc to the build phase.
#endif
回答by Ashley Mills
Just search for Automaticin your target's build settings:
只需在目标的构建设置中搜索Automatic：
