尝试加载视图时不允许解除分配

Question

我正在使用 swift 向我的服务器发送消息，但是，当它结束时，我无法获得弹出警报。这是代码。

func sendSimpleCommand(siteId: Int, command: String) -> Int {
    Alamofire.request(.GET, commandUrl, parameters: ["site": siteId, "command": command, "device": "ios"])
        .responseJSON { response in
            //print(response.result)   // result of response serialization

            switch response.result {
            case .Success(_):
                print("success code back from api server for command sent")
                let alertView = UIAlertController(title: "Command Sent", message: "Your \(command) has been sent.", preferredStyle: .Alert)
                let alertAction = UIAlertAction(title: "OK", style: .Default) { _ in
                }
                alertView.addAction(alertAction)
            case .Failure(_):
                print("FAIL code back from api server for command sent")
                let alertView = UIAlertController(title: "Connect Error", message: "Network error, please try again", preferredStyle: .Alert)
                let alertAction = UIAlertAction(title: "OK", style: .Default) { _ in
                }
                alertView.addAction(alertAction)
            }
    }
    return 1
}




@IBAction func startButtonTouch(sender: UIButton) {
   let helper = HelperActions()
   let site = ActiveSite.sharedInstance.siteObject
   let command: String = "start"
   sendSimpleCommand(site.id , command: command)
}

现在，当我运行它时，网络通信正常进行，但随后出现错误并且警报窗口从未出现。

不允许在解除分配时尝试加载视图控制器的视图，这可能会导致未定义的行为

Answer 1

只需在代码顶部添加这一行即可发出 UIAlertController 的全局请求。

与 swift 一样，我们不必释放任何视图。 Swift 语言在他们身边处理它。

let alertView : UIAlertController?

删除类中所有alertView的声明

编辑

func sendSimpleCommand(siteId: Int, command: String) -> Int {
Alamofire.request(.GET, commandUrl, parameters: ["site": siteId, "command": command, "device": "ios"])
    .responseJSON { response in
        //print(response.result)   // result of response serialization

        switch response.result {
        case .Success(_):
            print("success code back from api server for command sent")
            alertView = UIAlertController(title: "Command Sent", message: "Your \(command) has been sent.", preferredStyle: .Alert)
            let alertAction = UIAlertAction(title: "OK", style: .Default) { _ in
            }
            alertView.addAction(alertAction)
        case .Failure(_):
            print("FAIL code back from api server for command sent")

            alertView = UIAlertController(title: "Connect Error", message: "Network error, please try again", preferredStyle: .Alert)
            let alertAction = UIAlertAction(title: "OK", style: .Default) { _ in
            }
            alertView.addAction(alertAction)
        }
}
return 1
}




@IBAction func startButtonTouch(sender: UIButton) {
   let helper = HelperActions()
   let site = ActiveSite.sharedInstance.siteObject
   let command: String = "start"
   sendSimpleCommand(site.id , command: command)
}