IOS开发的objectivec变量类型的字符表示
来源:爱站网时间:2020-09-04编辑:网友分享
在Objective开发中,通常变量不是由我们自己决定的,而是在运行的时候决定的,要实现这个功能说难也难,说简单也简单,别着急,下面就让爱站技术频道小编带你一起来了解IOS开发的objectivec变量类型的字符表示,需要的朋友可以参考下文了解。
在Objective开发中,通常变量不是由我们自己决定的,而是在运行的时候决定的,要实现这个功能说难也难,说简单也简单,别着急,下面就让爱站技术频道小编带你一起来了解IOS开发的objectivec变量类型的字符表示,需要的朋友可以参考下文了解。
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。
本文是爱站技术频道小编为大家带来的IOS开发的objectivec变量类型的字符表示,希望对你学习这方面有所帮助,也希望大家能一如既往的支持js.aizhan.com。