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https://issues.apache.org/jira/browse/WEEX-88?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16249168#comment-16249168
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ASF GitHub Bot commented on WEEX-88:
------------------------------------
Github user acton393 commented on the issue:
https://github.com/apache/incubator-weex/pull/850
hi @xusw thx for your contribution, it will be accepted.
> BOOL arguments cannot be received correctly by component's method in 32-bit
> iOS devices
> ---------------------------------------------------------------------------------------
>
> Key: WEEX-88
> URL: https://issues.apache.org/jira/browse/WEEX-88
> Project: Weex
> Issue Type: Bug
> Components: iOS
> Affects Versions: 0.15
> Environment: iPhone 4s (iOS 9.1), iPhone 5 simulator (iOS 10.3)
> Reporter: Shiwen XU
> Assignee: Adam Feng
> Priority: Blocker
>
> BOOL arguments cannot be received correctly by component's method in 32-bit
> iOS devices. It appears that the received argument is always some integer
> value other than boolean value.
> This problem might be introduced by the macro *WX_ARGUMENTS_SET*.
> {code:title=WXUtility.h|borderStyle=solid}
> #define WX_ARGUMENTS_SET(_invocation, _sig, idx, _obj, _ppFree) \
> do {\
> const char *encode = [_sig getArgumentTypeAtIndex:(idx) + 2];\
> switch(encode[0]){\
> WX_EPCHAR_CASE(_invocation, idx, _C_CHARPTR, _obj, char *,
> UTF8String, _ppFree)\
> WX_ENUMBER_CASE(_invocation, idx, _C_INT, _obj, int, intValue,
> _ppFree)\
> WX_ENUMBER_CASE(_invocation, idx, _C_SHT, _obj, short, shortValue,
> _ppFree)\
> WX_ENUMBER_CASE(_invocation, idx, _C_LNG, _obj, long, longValue,
> _ppFree)\
> WX_ENUMBER_CASE(_invocation, idx, _C_LNG_LNG, _obj, long long,
> longLongValue, _ppFree)\
> WX_ENUMBER_CASE(_invocation, idx, _C_UCHR, _obj, unsigned char,
> unsignedCharValue, _ppFree)\
> WX_ENUMBER_CASE(_invocation, idx, _C_UINT, _obj, unsigned int,
> unsignedIntValue, _ppFree)\
> WX_ENUMBER_CASE(_invocation, idx, _C_USHT, _obj, unsigned short,
> unsignedShortValue, _ppFree)\
> WX_ENUMBER_CASE(_invocation, idx, _C_ULNG, _obj, unsigned long,
> unsignedLongValue, _ppFree)\
> WX_ENUMBER_CASE(_invocation, idx, _C_ULNG_LNG, _obj,unsigned long
> long, unsignedLongLongValue, _ppFree)\
> WX_ENUMBER_CASE(_invocation, idx, _C_FLT, _obj, float, floatValue,
> _ppFree)\
> WX_ENUMBER_CASE(_invocation, idx, _C_DBL, _obj, double, doubleValue,
> _ppFree)\
> WX_ENUMBER_CASE(_invocation, idx, _C_BOOL, _obj, bool, boolValue,
> _ppFree)\
> default: { [_invocation setArgument:&_obj atIndex:(idx) + 2];
> *(_ppFree + idx) = 0; break;}\
> }\
> }while(0)
> {code}
> The BOOL value in 32-bit iOS is a typedef of signed char so its *@encode* is
> *_C_CHR* instead of *_C_BOOL*. We can find the typedef in objc.h.
> {code:title=objc.h|borderStyle=solid}
> #if defined(__OBJC_BOOL_IS_BOOL)
> // Honor __OBJC_BOOL_IS_BOOL when available.
> # if __OBJC_BOOL_IS_BOOL
> # define OBJC_BOOL_IS_BOOL 1
> # else
> # define OBJC_BOOL_IS_BOOL 0
> # endif
> #else
> // __OBJC_BOOL_IS_BOOL not set.
> # if TARGET_OS_OSX || (TARGET_OS_IOS && !__LP64__ && !__ARM_ARCH_7K)
> # define OBJC_BOOL_IS_BOOL 0
> # else
> # define OBJC_BOOL_IS_BOOL 1
> # endif
> #endif
> #if OBJC_BOOL_IS_BOOL
> typedef bool BOOL;
> #else
> # define OBJC_BOOL_IS_CHAR 1
> typedef signed char BOOL;
> // BOOL is explicitly signed so @encode(BOOL) == "c" rather than "C"
> // even if -funsigned-char is used.
> #endif
> {code}
> But *WX_ARGUMENTS_SET* didn't consider the case of *_C_CHR*. In this case the
> default condition is executed and the *NSNumber pointer* value will be casted
> to a *BOOL* value so the received argument is always wrong.
> If I add this line of code and the received argument will become correct.
> {code}
> WX_ENUMBER_CASE(_invocation, idx, _C_UCHR, _obj, unsigned char,
> unsignedCharValue, _ppFree)\
> /* added code */
> WX_ENUMBER_CASE(_invocation, idx, _C_CHR, _obj, char, charValue, _ppFree)\
> {code}
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