条件绑定的初始值设定项必须具有 Optional 类型，而不是 '[String : Any]' [英] Initializer for conditional binding must have Optional type, not '[String : Any]'

问题描述

谁能告诉我如何解决这个问题?我只是想从事物说话中接收信号.

Can anyone tell me how to fix this? Im just trying to receive signals from thing speak.

   `self.title = "Home"
    print("Requesting data...")
    Alamofire.request( "https://api.thingspeak.com/channels/290427/feeds.json", parameters: ["results": "1", "location": "false"]) // Gets the latest info from ThingSpeak
        .responseJSON { response in

            print("Data downloaded: \(response.result)")
            if let json = response.result.value as! [String:Any] {
                print(json) //see full data

                if let feeds = json["feeds"] as? [String: Any] {

                    for feed in feeds {
                        print(feed["field2"])
                        if let temperatureStr = feed["field2"] as? String, let dateStr = feed["created_at"] as? String {
                            if let temperature = Double(temperatureStr){
                                self.label.text = "Temperature: \(temperature)°F" //Displays last updated data entry

                            }

错误在一行

if let json = response.result.value as! [String:Any] {

错误消息说条件绑定的初始化程序必须具有可选类型，而不是 '[String : Any]'

Error message says "Initializer for conditional binding must have Optional type, not '[String : Any]'

推荐答案

如果你想使用条件绑定，表达式的右边应该是可选的.

If you wanna use conditional binding, the right side of the expression should be optional.

改变这个:

if let json = response.result.value as! [String:Any]

为此:

if let json = response.result.value as? [String:Any]

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