Question

了解GRMustache和Swift。

如果我有一个父类实现MustacheBoxable的类和子类，是否可以在子节点上扩展mustacheBox而不重复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
      ])
    }
}

提前感谢任何提示/指导：）

Answer 1

虽然我不认为这很优雅，但我确实找到了解决这个问题的方法。

创建变量（＆＃34; boxedValues＆＃34;），用于从父类导出属性
parent上的mustacheBox返回盒装变量
然后，子类可以访问父类（＆＃34; boxedValues＆＃34;）变量并添加值
mustacheBox的实现只是继续为子类工作

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
    }
}

GRMustache - 子类上的mustacheBox

1 个答案: