类型 'Like' 没有下标成员？

Question

我有 2 个自定义 classes。我正在尝试将 likes 字典的值从 Like class 分配给 Post [=] likes 属性的值19=]。但我得到了：

Type 'Like' has no subscript member

class Like {
    var likes: Dictionary<String, Any>?
    var userUid: String?
}

extension Like {

    static func transfromLikes(dictionary: [String : Any]) -> Like {

        let like = Like()

        like.likes = dictionary["likes"] as? Dictionary<String, Any>
        like.userUid = dictionary["userUid"] as? String

        return like
    }
}

class Post {

   var id           : String?
   var title        : String?
   var content      : String?
   var userUid      : String?
   var isLiked      : Bool? = false
   var likes        : Like?
   var likesCount   : Int?
}

extension Post {

    static func transformDataToImagePost (dictionary: [String : Any], key: String) -> Post {
        let post = Post()
        let like = Like()
        post.id        = key
        post.userUid   = dictionary["userUid"] as? String
        post.title     = dictionary["title"] as? String
        post.likes     = like.likes?["likes"] as? Like

        if let currentUserId = Api.Users.CURRENT_USER?.uid {
            if post.likesCount != nil {
                post.isLiked = post.likes?[currentUserId] != nil // this is the error
            }
        }
        return post
    }

Answer 1

post.likes 是 Like? 类型。您需要在订阅之前添加属性 likes：

post.isLiked = post.likes?.likes?[currentUserId] != nil

类型 'Like' 没有下标成员？

Type 'Like' has no subscript member?

xcode

class

subscript

swift