swift-'（AnyObject）'不是'NSObject'的子类型

Question

我是快速开发的新手，我按照教程进行操作，一切都很好，直到遇到此错误并且我不知道如何解决它。你能帮我吗？

if let json = response.result.value {
    let jsonArray:NSArray = json as! NSArray
    /// On fait la boucle pour avoir la liste globale des éléments a afficher
    for i in 0..<jsonArray.count {
        self.OPlays.append(Playlist(
            title:(jsonArray[i] as AnyObject).value(forKey: "title") as? String,
                artist:(jsonArray[i] as AnyObject).value(forKey: "artist") as? String,
                categorie:(jsonArray[i] as AnyObject).value(forKey: "categorie") as? String,
                cover_url:(jsonArray[i] as AnyObject).value(forKey: "cover_url") as? String)
        )
    }
    self.tableViewPlaylist.reloadData()
}        

新闻文件正确。

if let json = response.result.value {
    let jsonArray:NSArray = json as! NSArray

    /// On fait la boucle pour avoir la liste globale des éléments a afficher
    for i in 0..<jsonArray.count {
        self.OPlays.append(Playlist(
            id: (jsonArray[i] as AnyObject).value(forKey: "id") as? Int,
            title: (jsonArray[i] as AnyObject).value(forKey: "title") as? String,
            artist: (jsonArray[i] as AnyObject).value(forKey: "artist") as? String,
            cover_url: (jsonArray[i] as AnyObject).value(forKey: "cover_url") as? String,
            categorie: (jsonArray[i] as AnyObject).value(forKey: "categorie") as? String
        ))
    }
    self.tableViewPlaylist.reloadData()
}

Answer 1

我要切除所有AnyObject代码：

if let array = response.result.value as? [[String: Any]] {
    for dictionary in array {
        self.OPlays.append(Playlist(
            id: dictionary["id"] as? Int,
            title: dictionary["title"] as? String,
            artist: dictionary["artist"] as? String,
            categorie: dictionary["categorie"] as? String,
            cover_url: dictionary["cover_url"] as? String
        ))
    }
    self.tableViewPlaylist.reloadData
}

就我个人而言，我会走得更远，摆脱手动解码JSON的麻烦。使用JSONDecoder。

struct Playlist: Codable {
    let id: Int?
    let title: String?
    let artist: String?
    let categorie: String?
    let cover_url: String?
}

然后，假设您具有已展开的data对象Data：

do {
    self.OPlays = JSONDecoder().decode([Playlist].self, from: data)
} catch {
    print(error)
}

或者，如果您使用的是Alamofire，请考虑使用基于JSONDecoder的response方法的Alamofire 5。