Runtime 自动化归档

Runtime的使用

 (id)initWithCoder:(NSCoder *)decoder
 {
 　　if (self = [super init]) {
 　　unsigned int count = ;
 　　Ivar *ivars = class_copyIvarList([self class], &count);

 　　for (int i = ; i<count; i++) {
     　　
    　　 Ivar ivar = ivars[i];

     　　// 获取成员变量
     　　const char *name = ivar_getName(ivar);

     　　// 归档
     　　NSString *key = [NSString stringWithUTF8String:name];
     　　id value = [decoder decodeObjectForKey:key];

     　　// 设置
     　　[self setValue:value forKey:key];
 　　}

 　　free(ivars);
 　　}
 　　return self;
 }

 - (void)encodeWithCoder:(NSCoder *)encoder
 {

     unsigned int count = ;
     Ivar *ivars = class_copyIvarList([self class], &count);

     for (int i = ; i<count; i++) {

         Ivar ivar = ivars[i];

         //获取成员变量
         const char *name = ivar_getName(ivar);

         // 归档
         NSString *key = [NSString stringWithUTF8String:name];
         id value = [self valueForKey:key];
         [encoder encodeObject:value forKey:key];
     }

     free(ivars);
 }