实例代码：
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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：
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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
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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：
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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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原文链接：http://blog.csdn.net/nunchakushuang/article/details/39317309
