ios中使用NSCoding的问题，自定义数据类型包含自定义数据类型该怎么用

-(id)initWithCoder:(NSCoder *)aDecoder
{

if (self = [super init]) {
    self.brand = [aDecoder decodeObjectForKey:@"brand"];
    self.series = [aDecoder decodeObjectForKey:@"series"];
    self.year = [aDecoder decodeObjectForKey:@"year"];
    self.model = [aDecoder decodeObjectForKey:@"model"];
}
return  self;

}
-(void)encodeWithCoder:(NSCoder *)aCoder
{

[aCoder encodeObject:self.brand forKey:@"brand"];
[aCoder encodeObject:self.series forKey:@"series"];
[aCoder encodeObject:self.year forKey:@"year"];
[aCoder encodeObject:self.buttonArray forKey:@"model"];

}
只要那4个类都实现了NSCoding接口即可，它就会递归调用，也就是说，[aDecoder decodeObjectForKey:@"brand"] 会调Car_brand的-(id)initWithCoder:(NSCoder *)aDecoder。

顺便说一下，iOS 里的类名是驼峰命名的，最好不要加下划线。比如Car_brand改成CarBrand较好。