无法将objectForKey - [String：AnyObject]作为字典

Question

我正在使用手表连接来接收消息（在objectiveC中生成的字典）。 被调用的委托函数（swift）并不想正确解释所接收的字典。

在我的dict中找不到ObjectForKey。是什么原因？ 感谢

   func session(session: WCSession, didReceiveMessage message: [String : AnyObject]) {
        print("\nWC watch:\n Did receive didReceiveMessage: \(message)")
        var messageDict = message as Dictionary<String, AnyObject> //here I wanted to cast to Dictionary
        let newState = messageDict.objectForKey(WatchManagerMessageMaskStateKey) //but the messageDict does not know objectForKey
}

Answer 1

[String : AnyObject]和Dictionary<String, AnyObject>是完全相同的两个符号。

objectForKey属于NSDictionary，用于Swift原生类型使用密钥订阅 您可以将结果转换为更具体的内容。

func session(session: WCSession, didReceiveMessage message: [String : AnyObject]) {
    print("\nWC watch:\n Did receive didReceiveMessage: \(message)")
    let newState = message[WatchManagerMessageMaskStateKey]
    ...
}