1 //解档
 2 - (id)initWithCoder:(NSCoder *)decoder
 3 {
 4     if (self = [super init]) {
 5         unsigned int count = 0;
 6         //获取类中所有成员变量名
 7         Ivar *ivar = class_copyIvarList([self class], &count);
 8         for (int i = 0; i<count; i++) {
 9             Ivar iva = ivar[i];
10             const char *name = ivar_getName(iva);
11             NSString *strName = [NSString stringWithUTF8String:name];
12             //进行解档取值
13             id value = [decoder decodeObjectForKey:strName];
14             //利用KVC对属性赋值
15             [self setValue:value forKey:strName];
16         }
17         free(ivar);
18     }
19     return self;
20 }
 1 //归档
 2 - (void)encodeWithCoder:(NSCoder *)encoder
 3 {
 4     unsigned int count;
 5     Ivar *ivar = class_copyIvarList([self class], &count);
 6     for (int i=0; i<count; i++) {
 7         Ivar iv = ivar[i];
 8         const char *name = ivar_getName(iv);
 9         NSString *strName = [NSString stringWithUTF8String:name];
10         //利用KVC取值
11         id value = [self valueForKey:strName];
12         [encoder encodeObject:value forKey:strName];
13     }
14     free(ivar);
15 }

大家在做归档与解档的时候，都需要在要归档的自定义类中服从<NSCoding>协议，并实现对应的每个方法，并在方法中对每个属性进行大部分代码的编写，但是现在只需要赋值上文中的两端代码就OK了