禁用ARC的.h文件iphonesdk

问题描述

我的项目使用ARC，而我想使用不兼容ARC的GDATA API.我知道如何禁用单个文件的ARC(通过为这些文件添加-fno-objc-arc编译器标志).但是在GDataObject.h文件中，结构定义为

My projects uses ARC and I want to use GDATA api which is not ARC Compatible.I know how to disable ARC for single file(by adding the -fno-objc-arc compiler flag for those files). But in GDataObject.h file there is a structure defenition as

typedef struct GDataDescriptionRecord {
    NSString *label;
    NSString *keyPath;
    enum GDataDescRecTypes reportType;
} GDataDescriptionRecord;

它会导致类似

ARC forbids object in struct or union

如何避免此问题.是否有可用的ARC兼容GDATA API或以任何方式为.h文件禁用arc

How can I avoid this problem.Is there any ARC compatible GDATA api available or any way to disable arc for .h files

推荐答案

我会使用以下内容:

#if __has_feature(objc_arc)
#define ARC_MEMBER __unsafe_unretained
#else
#define ARC_MEMBER
#endif

然后，您的结构将如下所示:

Then, your structure would look something like this:

typedef struct GDataDescriptionRecord {
    ARC_MEMBER NSString *label;
    ARC_MEMBER NSString *keyPath;
    enum GDataDescRecTypes reportType;
} GDataDescriptionRecord;

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