将非ARC文件子类化为Xcode 4中的ARC项目
我在ARC项目中使用了一些非ARC代码，即Three20。我添加了所有适当的编译器标志，一切正常。但是，我需要继承一些Three20类中的一些，并且我不确定是否应该将编译器标志添加到非ARC的新文件中，或者如果编译器将其解决，并添加适当的释放调用。
I am using some non-ARC code in my ARC project, namely Three20. I have added all the appropriate compiler flags and all works well. However, I need to subclass some of the Three20 classes, and I'm not sure if I should add the compiler flag to my new file for non-ARC, or if the compiler will figure it out, and add the appropriate release calls.
回顾一下：
- XCode 4中的ARC项目
- 包括非ARC代码（Three20）
- 需要子类在非ARC文件中定义的内容
- 我是否需要添加发布调用？
- 我是否需要在子类中为非ARC添加编译器标志？
Just to recap: - ARC project in XCode 4 - Includes non-ARC code (Three20) - Need to subclass something defined in non-ARC files - Do I need to add release calls? - Do I need to add compiler flag for non-ARC in subclass?
Michael，
ARC是一种编译时技术，它根据内存中的给定插槽是否将持续超出当前方法/函数调用来确定保留/释放语义。因此，您可以安全地使用ARC混合子类。我一直这样做。我也是按类别来做的。与垃圾收集不同，ARC非常关注每个方法/功能中的存储空间。顺便说一下，iOS的大多数框架似乎还没有使用ARC。因此，您构建框架类的任何子类都有这个问题而且它不是问题。
ARC is a compile time technology that determines retain/release semantics based upon whether a given slot in memory will persist beyond the current method/function invocation. Because of this, you can safely intermix subclasses using ARC or not. I do it all of the time. I also do it in categories. Unlike garbage collection, ARC is quite focussed on just the storage space in each method/function. BTW, most of iOS's frameworks do not appear to yet use ARC. Hence, any subclass you make of a framework class has this "problem" and it just isn't an issue.
回答您的具体问题：
回顾一下： - XCode 4中的ARC项目 - 包括非ARC代码
（Three20） - 需要子类化非ARC中定义的内容文件 - 我需要增加发布电话吗？ - 我是否需要在子类中为
非ARC添加编译器标志？
Just to recap: - ARC project in XCode 4 - Includes non-ARC code (Three20) - Need to subclass something defined in non-ARC files - Do I need to add release calls? - Do I need to add compiler flag for non-ARC in subclass?
您的非ARC超类的子类可以是ARC也可以不是。由于您的应用的默认设置是ARC，因此您无需对子类执行任何操作。
Your subclass of a non-ARC superclass can be either ARC or not. As the default setting for your app is ARC, you need do nothing to your subclass.
Andrew