ios 类型编码表

Table 6-1  Objective-C type encodings

Code

Meaning

c

A char

i

An int

s

A short

l

A long

l is treated as a 32-bit quantity on 64-bit programs.

q

A long long

C

An unsigned char

I

An unsigned int

S

An unsigned short

L

An unsigned long

Q

An unsigned long long

f

A float

d

A double

B

A C++ bool or a C99 _Bool

v

A 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 union

bnum

A bit field of num bits

^type

A pointer to type

?

An unknown type (among other things, this code is used for function pointers)