swift - 如何使 struct 和 typealias 符合@objc

Question

是否有可能使 struct 和/或 typealias 符合 @objc？我希望创建可选的协议(protocol)函数，一个返回一个 struct，另一个返回一个 typealias。

public typealias SwiperData = (image: UIImage, title: String)

public struct SwiperPeekViewControllers{
  public var parentViewController: UIViewController!
  public var contentViewController: UIViewController!
  public init(parentVC: UIViewController, contentVC: UIViewController){
    parentViewController = parentVC
    contentViewController = contentVC
  }
}

协议(protocol)

    @objc public protocol SwiperPeekViewDelegate: class{
      func didUndoAction(index: Int, dataSource: SwiperData) 
// Method cannot be a member of an @objc protocol because the type of the parameter 2 cannot be represented in Objective-C
      func swiperPeekViewControllers()->SwiperPeekViewControllers
      func swiperPeekViewSize()->CGSize
    }

Answer 1

您不能将类型别名导出到 Objective-C。你不能为元组做这件事。但是，关于 typealias，仍然可以为某些结构编写 Obj-C typedef 并在 Swift 中使用它，它将导出为 typealias