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":[NSNumbernumberWithBool:YES],
@"2":[NSNumbernumberWithChar:'1'],
@"3":[NSNumbernumberWithDouble:2.0],
@"4":[NSNumbernumberWithFloat:2.0f],
@"5":[NSNumbernumberWithInt:1],
@"6":[NSNumbernumberWithInteger:2],
@"7":[NSNumbernumberWithLong:30],
@"8":[NSNumbernumberWithLongLong:3],
@"9":[NSNumbernumberWithShort:4],
@"10":[NSNumbernumberWithUnsignedChar:'1'],
@"11":[NSNumbernumberWithUnsignedInt:3],
@"12":[NSNumbernumberWithUnsignedInteger:35],
@"13":[NSNumbernumberWithUnsignedLong:45],
@"14":[NSNumbernumberWithUnsignedLongLong:59],
@"15":[NSNumbernumberWithUnsignedShort:4]
};
for(NSString*keyindic){
idvalue=[dicvalueForKey:key];
if([valueisKindOfClass:[NSNumberclass]]){
constcharchar*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(longlong)); NSLog(@"9=>%s",@encode(short)); NSLog(@"10=>%s",@encode(unsignedchar)); NSLog(@"11=>%s",@encode(unsignedint)); NSLog(@"12=>%s",@encode(unsignedlong));//unsignedNSInteger NSLog(@"13=>%s",@encode(unsignedlong)); NSLog(@"14=>%s",@encode(unsignedlonglong)); NSLog(@"15=>%s",@encode(unsignedshort));
以上的输出结果证明：
BOOL=>c char=>c double=>d float=>f int=>i NSInteger=>q long=>q longlong=>q short=>s unsignedchar=>C unsignedint=>I unsignedNSInteger=>Q unsignedlong=>Q unsignedlonglong=>Q unsignedshort=>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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