在 Swift 中，我如何将以下内容组合成一个类？

class FirstClass: Codable, ObservableObject {
  @Published var int: Int
  @Published var bool: Bool
  @Published var firstObject: FirstType

// plus inits and custom decoding/encoding stuff

}

class SecondClass: Codable, ObservableObject {
  @Published var int: Int
  @Published var bool: Bool
  @Published var secondObject: SecondType

// plus inits and custom decoding/encoding stuff

}

class ThirdClass: Codable, ObservableObject {
  @Published var int: Int
  @Published var bool: Bool
  @Published var thirdObject: ThirdType

// plus inits and custom decoding/encoding stuff

}

(with FirstType, SecondType and ThirdType also being class models that conform to Codable and ObservableObject)

为了结束这样的事情：

class CommonClass: Codable, ObservableObject {
  @Published var int: Int
  @Published var bool: Bool
  @Published var object: CommonType // which could accept FirstType, SecondType or ThirdType

// plus inits and custom decoding/encoding stuff

}

我该怎么做呢？是否有更好的方法仍然按我的意图工作？

我基本上是想实现两件事：1-避免重复代码（就像在我的现实生活中一样，除了 int 和 bool 之外，还有更多的共同变量）和 2-希望也使下游代码更简单尽量减少对单独视图的需要。

回答

class CommonClass<T>: Codable, ObservableObject {
//class CommonClass<T: CommonType>: Codable, ObservableObject { // << as variant
  @Published var int: Int
  @Published var bool: Bool
  @Published var object: T

// plus inits and custom decoding/encoding stuff

}