Swift 不支持多重继承，如何实现? [英] Swift does not support multiple inheritance, How could be achieved?

问题描述

以下代码:

class City {
    var cityId : String?
    var cityName : String?
}

class Town {
    var townid : String?
    var townName : String?

}

class Address : City , Town {

    var house : String?
    var street: String?

}

产生编译时错误:

Address.swift:38:24:来自类City"和Town"的多重继承

Address.swift:38:24: Multiple inheritance from classes 'City' and 'Town'

我怎样才能解决他的那种问题?遵循什么方法?

How can I solve his kind of problem? What approach to follow?

推荐答案

看来你想多了.而不是继承，尝试使用更多的组合.地址不应从 City 继承.为什么?因为从逻辑上讲，地址不是一种城市.相反，城市定义是地址的一部分:

It seems you are overthinking things. Instead of inheritance, try to use more composition. An address should not inherit from City. Why? Because logically an address is not a type of city. Instead, city definition is part of the address:

class Address { 
    var city: City?
    var town: Town?

    var house : String?
    var street: String?
}

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