1. description 방법의 일반적인 용도

   1:   //  

   2:      NSLog(@"%p", &p);

   3:      //  

   4:      NSLog(@"%p", p);

   5:      // < ： >

   6:      NSLog(@"%@", p);

<!--
.csharpcode, .csharpcode pre
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.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
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.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
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width: 100%;
margin: 0em;
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.csharpcode .lnum { color: #606060; }
-->
 

   1:  Class c = [Person class];

   2:      

   3:      // 1. +description 

   4:      // 2. +description （NSString *） 

   5:      NSLog(@"%@", c);

<!--
.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }
-->
Java와 유사한 toString()
 

2. description 방법의 일반적인 용도 주의점

   1:  //  ， NSLog %@ ， ：< ： >

   2:      

   3:      // 1. p -description 

   4:      // 2. -description （NSString *） 

   5:      // 3.-description “ + ”

   6:      NSLog(@"%@", p);

   7:      

   8:      //Person *p2 = [[Person alloc] init];

   9:      //NSLog(@"%@", p2);

  10:      

  11:      //NSString *name = @"Rose";

  12:      

  13:      //NSLog(@" %@", name);

  14:      

  15:      Person *p2 = [[Person alloc] init];

  16:      p2.age = 25;

  17:      p2.name = @"Jake";

  18:      

  19:      NSLog(@"%@", p2);

<!--
.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
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.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
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.csharpcode .lnum { color: #606060; }
-->

3. description 방법의 용법

   1:  //  

   2:  //- (NSString *)description

   3:  //{

   4:  //    //  

   5:  //    // NSLog(@"%@", self);

   6:  //    return [NSString stringWithFormat:@"age=%d, name=%@", _age, _name];

   7:  //    //return @"3424324";

   8:  //}

   9:   

  10:  //  

  11:  + (NSString *)description

  12:  {

  13:      return @"Abc";

  14:  }

<!--
.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
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background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
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.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }
-->