iOS方法返回值和参数对应的Type Encodings

CodeMeaningcA chariAn intsA shortlA longqA long longCAn unsigned charIAn unsigned intSAn unsigned shortLAn unsigned longQAn unsigned long longfA floatdA doubleBA C++ bool or a C99 _BoolvA void*A character string (char *)@An object (whether statically typed or typed id)#A class object (Class):A method selector (SEL)[array type]An array{name=type…}A structure(name=type…)A unionbnumA bit field of num bits^typeA pointer to type?An unknown type (among other things, this code is used for function pointers)

参考：开发者文档

或者在 objc/runtime.h 第1560行和1589行可以找到相关信息

#define _C_ID '@' #define _C_CLASS '#' #define _C_SEL ':' #define _C_CHR 'c' #define _C_UCHR 'C' #define _C_SHT 's' #define _C_USHT 'S' #define _C_INT 'i' #define _C_UINT 'I' #define _C_LNG 'l' #define _C_ULNG 'L' #define _C_LNG_LNG 'q' #define _C_ULNG_LNG 'Q' #define _C_FLT 'f' #define _C_DBL 'd' #define _C_BFLD 'b' #define _C_BOOL 'B' #define _C_VOID 'v' #define _C_UNDEF '?' #define _C_PTR '^' #define _C_CHARPTR '*' #define _C_ATOM '%' #define _C_ARY_B '[' #define _C_ARY_E ']' #define _C_UNION_B '(' #define _C_UNION_E ')' #define _C_STRUCT_B '{' #define _C_STRUCT_E '}' #define _C_VECTOR '!' #define _C_CONST 'r'