ios - Swift Firebase - 上下文类型 'AnyObject' 不能与字典文字一起使用

Question

我收到这个错误，我不知道如何修复:

Contextual type 'AnyObject' cannot be used with dictionary literal

我在互联网上搜索过，但没有找到答案。这是我的代码:

struct Sweet {

let key:String!
let content:String!
let addedByUser:String!
let itemReft:FIRDatabaseReference?

init (content:String, addedByUser:String, key:String = "") {
    self.key = key
    self.content = content
    self.addedByUser = addedByUser
    self.itemReft = nil
}

init (snapshot:FIRDataSnapshot) {
    key = snapshot.key
    itemReft = snapshot.ref

    if let dict = snapshot.value as? NSDictionary, let postContent = dict["content"] as? String {
        content = postContent
    } else {
        content = ""
    }

    if let dict = snapshot.value as? NSDictionary, let postUser = dict["addedByUser"] as? String {
        addedByUser = postUser
    } else {
        addedByUser = ""
    }

}

func toAnyObject() -> AnyObject {
    return ["content":content, "addedByUser":addedByUser]
}

错误发生在这一行:

return ["content":content, "addedByUser":addedByUser]

我一直在学习本教程 iOS Swift Tutorial: Get started with Firebase and an App like Twitter

感谢您的宝贵时间!

Answer 1

您必须将文字转换为所需的类型

func toAnyObject() -> Any {
  return ["content":content, "addedByUser":addedByUser] as Any
}

但是 - 无意冒犯 - 将特定类型转换为更不特定的类型是愚蠢的。为什么不

func toDictionary() -> [String:String] {
  return ["content":content, "addedByUser":addedByUser]
}