swift - GRMustache-子类上的mustacheBox

深入了解GRMustache和Swift。

如果我有一个父类实现MustacheBoxable的类和子类，是否有可能在子对象上扩展mustacheBox而无需重复mustacheBox的整个变量设置？

class Host: MustacheBoxable {
  var name: String?
}
extension Host {
    var mustacheBox: MustacheBox {
      return Box([
         "name": self.name
      ])
    }
}

class TopGearHost: Host {
  var drives_slowly: Bool = false
}
extension Host {
    var mustacheBox: MustacheBox {
      //how would I go about NOT doing this?
      return Box([
          "name": self.name,  // don't want to repeat this guy
          "drives_slowly": self.drives_slowly
      ])
    }
}

在此先感谢您的提示/指导：）

最佳答案

虽然我认为这并不完美，但我确实找到了解决此问题的方法。


   创建变量（“ boxedValues”）以从父类导出属性
   父项上的mustacheBox返回装箱的变量
   然后，子类可以访问父变量（“ boxedValues”）并添加值
   mustacheBox的实现仅继续适用于子类

class Host: MustacheBoxable {
    var name: String?
}
extension Host {
    var boxedValues: [String:MustacheBox] {
        return [ "name" : self.name ]
    }
    var mustacheBox: MustacheBox {
        return Box(boxedValues)
    }
}
class TopGearHost: Host {
    var drives_slowly: Bool = false
}
extension Host {
    override var boxedValues: [String:MustacheBox] {
        var vals = super.boxedValues
        vals["drives_slowly"] = Box(self.drives_slowly)
        return vals
    }
}

关于swift - GRMustache-子类上的mustacheBox，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/34424159/