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