IOS 开发之ObjectiveC的变量类型的字符代表

ios 开发之objectivec的变量类型的字符代表

实例代码：

nsdictionary *dic = @{@"1":[nsnumber numberwithbool:yes], 
                @"2":[nsnumber numberwithchar:'1'], 
                @"3":[nsnumber numberwithdouble:2.0], 
                @"4":[nsnumber numberwithfloat:2.0f], 
                @"5":[nsnumber numberwithint:1], 
                @"6":[nsnumber numberwithinteger:2], 
                @"7":[nsnumber numberwithlong:30], 
                @"8":[nsnumber numberwithlonglong:3], 
                @"9":[nsnumber numberwithshort:4], 
                @"10":[nsnumber numberwithunsignedchar:'1'], 
                @"11":[nsnumber numberwithunsignedint:3], 
                @"12":[nsnumber numberwithunsignedinteger:35], 
                @"13":[nsnumber numberwithunsignedlong:45], 
                @"14":[nsnumber numberwithunsignedlonglong:59], 
                @"15":[nsnumber numberwithunsignedshort:4] 
                }; 
    for(nsstring *key in dic){ 
      id value = [dic valueforkey:key]; 
      if([value iskindofclass:[nsnumber class]]){ 
        const charchar * pobjctype = [((nsnumber*)value) objctype]; 
        nslog(@"%@,%s",key,pobjctype); 
      } 
    } 

以上的输出结果证明：

unsignedchar  =>s 
char      =>c 
unsignedshort  =>i 
longlong    =>d 
unsignedint   =>q 
float      =>f 
int       =>i 
unsignedinteger =>q 
integer     =>q 
unsignedlong  =>q 
long      =>q 
longlong    =>q 
unsignedlonglong=>q 
bool      =>c 
short      =>s 
double     =>d 

再看以下代码，用@encode关键字的

nslog(@"1=>%s",@encode(bool)); 
nslog(@"2=>%s",@encode(char)); 
nslog(@"3=>%s",@encode(double)); 
nslog(@"4=>%s",@encode(float)); 
nslog(@"5=>%s",@encode(int)); 
nslog(@"6=>%s",@encode(nsinteger)); 
nslog(@"7=>%s",@encode(long)); 
nslog(@"8=>%s",@encode(long long)); 
nslog(@"9=>%s",@encode(short)); 
nslog(@"10=>%s",@encode(unsigned char)); 
nslog(@"11=>%s",@encode(unsigned int)); 
nslog(@"12=>%s",@encode(unsigned long));//unsigned nsinteger 
nslog(@"13=>%s",@encode(unsigned long)); 
nslog(@"14=>%s",@encode(unsigned long long)); 
nslog(@"15=>%s",@encode(unsigned short)); 

以上的输出结果证明：

bool=>c 
 char=>c 
 double=>d 
 float=>f 
 int=>i 
 nsinteger=>q 
 long=>q 
 long long=>q 
 short=>s 
 unsigned char=>c 
 unsigned int=>i 
 unsigned nsinteger=>q 
 unsigned long=>q 
 unsigned long long=>q 
 unsigned short=>s 

读者可以根据这种方式来判断某个变量到底属于哪种类型。

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