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IOS 開發之ObjectiveC的變量類型的字符代表
實例代碼：
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);
}
}
以上的輸出結果證明：
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
再看以下代碼，用@encode關鍵字的
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));
以上的輸出結果證明：
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
讀者可以根據這種方式來判斷某個變量到底屬于哪種類型。
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