ARC宏定义

//ARC Helper
#ifndef WS_SUPPORT_ARC
#define WS_SUPPORT_ARC

#if __has_feature(objc_arc_weak)                //objc_arc_weak
#define WS_WEAK weak
#define __WS_WEAK __weak
#define WS_STRONG strong

#define WS_AUTORELEASE self
#define WS_RELEASE self
#define WS_RETAIN self
#define WS_CFTYPECAST(exp) (__bridge exp)
#define WS_TYPECAST(exp) (__bridge_transfer exp)
#define WS_CFRELEASE(exp) CFRelease(exp)
#define WS_DEALLOC self

#elif __has_feature(objc_arc)                   //objc_arc
#define WS_WEAK unsafe_unretained
#define __WS_WEAK __unsafe_unretained
#define WS_STRONG strong

#define WS_AUTORELEASE self
#define WS_RELEASE self
#define WS_RETAIN self
#define WS_CFTYPECAST(exp) (__bridge exp)
#define WS_TYPECAST(exp) (__bridge_transfer exp)
#define WS_CFRELEASE(exp) CFRelease(exp)
#define WS_DEALLOC self

#else                                           //none
#define WS_WEAK assign
#define __WS_WEAK
#define WS_STRONG retain

#define WS_AUTORELEASE autorelease
#define WS_RELEASE release
#define WS_RETAIN retain
#define WS_CFTYPECAST(exp) (exp)
#define WS_TYPECAST(exp) (exp)
#define WS_CFRELEASE(exp) CFRelease(exp)
#define WS_DEALLOC dealloc
#define __bridge

#endif//__has_feature

#endif//WS_SUPPORT_ARC
//ARC Helper