如何在 Swift 3 中解析 JSON 数组 [重复]

我从 Socket 获取了一些我想访问的数据，但收到错误消息，指出每次都无法将 NSArray 转换为 NSDictionary。

struct SocketEventHandler {
    let event: String
    let id: UUID
    let callback: NormalCallback

    func executeCallback(with items: [Any], withAck ack: Int, withSocket socket: SocketIOClient) {
        callback(items, SocketAckEmitter(socket: socket, ackNum: ack))
    }
}


let onFriendRequestStatus: NormalCallback = {dataArray,socketAck in
        AppLog.debug(tag: TAG, msg: "Response: \(dataArray)")
        AppLog.debug(tag: TAG, msg: "Response: \(dataArray[0])")
        let response  = dataArray[0] as! Dictionary<String, Any> **// APP CRASHES ON THIS LINE**
}

回复 ：-

[
    {
        "status": "A",
        "acceptorId": 126,
        "id": 94,
        "createdAt": "2017-06-05T09:50:42.000Z",
        "updatedAt": "2017-06-05T09:52:26.000Z",
        "userId": 126,
        "friendId": 401
    }
]

错误 - 无法将类型“__NSArrayM”(0x102f0de00) 的值转换为“NSDictionary”(0x102f0e2d8)。

可能你有二维数组意味着元素dataArray也都是Array not Dictionary.

if let response = dataArray[0] as? [[String: Any]], let dictionary = response.first {

    print(dictionary["status"])
}