如何在 swift 中指定 NSDictionary 参数的键和值数据类型？

发布于 2025-01-10 21:56:54 字数 770 浏览 1 评论 0原文

我想在 swift 中定义一个也可以在 Objective-C 中使用的函数。我有一个枚举：

    @objc public enum BookType: Int {
      case novel
      case magazine
    
      func name() -> String {
          switch self {
          case .novel:
              return "novel"
          case .magazine:
              return "magazine"
          }
      }
  }

函数是：

@objc public func uploadBookImages(images: [BookType: UIImage]) {
       // code here
}

这个函数会给我带来一个编译错误说：

方法不能被标记@objc，因为参数的类型不能在 Objective-C 中表示

这可能是因为 Objective-C 不接受 swift 字典，因为它是一个结构体。我正在考虑使用 NSDictionary 而不是 swift 字典。但是，如何使用 NSDictionary 将参数数据类型指定为 [BookType: UIImage]？我想传递 NSDictionary当我调用该函数时。

原文

I would like to define a function in swift that can be used in objective-c as well. I have a enum:

    @objc public enum BookType: Int {
      case novel
      case magazine
    
      func name() -> String {
          switch self {
          case .novel:
              return "novel"
          case .magazine:
              return "magazine"
          }
      }
  }

And the function is:

@objc public func uploadBookImages(images: [BookType: UIImage]) {
       // code here
}

This function will bring me an compile error said that:

Method cannot be marked @objc because the type of the parameter cannot
be represented in Objective-C

It might because objective-c doesn't accept swift dictionary since it is a structure. I am thinking to use NSDictionary instead of a swift dictionary. However, how can I specify the argument data type to [BookType: UIImage] using a NSDictionary? I want to pass a NSDictionary<BookType: UIImage> to the function when I call it.

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怀念你的温柔 2025-01-17 21:56:56

您需要使用 NSDictionary 而不是 swift Dictionary

  func uploadBookImages(images: NSDictionary) {
    // code here
    print(images)
}

用法：

   let dictParams:Dictionary<BookType, Int> = [
        BookType.magazine : 1,
        BookType.novel : 2,
        ];
    
    uploadBookImages(images: dictParams as NSDictionary)

You need to use NSDictionary instead of swift Dictionary

  func uploadBookImages(images: NSDictionary) {
    // code here
    print(images)
}

Usage:

   let dictParams:Dictionary<BookType, Int> = [
        BookType.magazine : 1,
        BookType.novel : 2,
        ];
    
    uploadBookImages(images: dictParams as NSDictionary)

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