Runtime 自动化归档

Runtime的使用

(id)initWithCoder:(NSCoder *)decoder 
{ 
　　if (self = [super init]) {
　　unsigned int count = 0;
　　Ivar *ivars = class_copyIvarList([self class], &count);

　　for (int i = 0; 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 = 0;
    Ivar *ivars = class_copyIvarList([self class], &count);

    for (int i = 0; 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);
}