讓obj-c也可以跟swift一樣，enum支援字串

	#define LIST_OF_ServerAPI \
	/*會員*/ \
	api(登入, member/login) \
	api(FB登入, member/fbLogin)
	typedef NS_ENUM(NSInteger, ServerAPI) {
	#define api(key, name) key,
	LIST_OF_ServerAPI
	#undef api
	};
	- (void)call {
	NSString *apiKey;
	NSString *apiName;
	switch (api) {
	#define api(key, name) \
	case key: \
	apiKey = @#key; \
	apiName = @#name; \
	break;
	LIST_OF_ServerAPI
	#undef api
	default:
	NSAssert1(false, @"%@：ServerAPI未實作", NSStringFromSelector(_cmd));
	return;
	}
	}

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