Question

我收到错误：Use of unresolved identifier 'json'

从这一行开始：if let parseJSON = json {

这是与错误相关的代码片段

        let task = NSURLSession.sharedSession().dataTaskWithRequest(request){
          data, response, error in

            if error != nil {
                print("error=\(error)")
                return
            }
            do {
                if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {
                    print(jsonResult)
                }
            } catch let error as NSError {
                print(error.localizedDescription)
            }
            if let parseJSON = json {
                var resultValue:String = parseJSON["status"] as String!;
                print("Result: \(resultValue)")

                if(resultValue=="Success")
                {

            //Login is sucessful
            NSUserDefaults.standardUserDefaults().setBool(true,forKey:"isUserLoggedIn");
             NSUserDefaults.standardUserDefaults().synchronize()

                    self.dismissViewControllerAnimated(true, completion: nil)

}

}

}

task.resume()

}

}

我查看了这个问题：Swift : Use of unresolved identifier 'json'但我不知道如何解决我的问题或将变量放在json

的位置

Answer 1

我认为你打算写if let parseJSON = jsonResult，但无论如何都不会有效，因为do中声明的变量只在该范围内可见。您需要在do内移动相关代码。您可以将JSONSerialization的结果直接分配给parsJSON。

您还应将此行var resultValue:String = parseJSON["status"] as String!更改为var resultValue:String = parseJSON["status"] as! String

像这样修改你的代码：

let task = NSURLSession.sharedSession().dataTaskWithRequest(request){
    data, response, error in

    if error != nil {
        print("error=\(error)")
        return
    }
    do {
        if let parseJSON = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {
            print(parseJSON)

            let resultValue:String = parseJSON["status"] as! String
            print("Result: \(resultValue)")

            if(resultValue=="Success")
            {
                //Login is sucessful
                NSUserDefaults.standardUserDefaults().setBool(true,forKey:"isUserLoggedIn");
                NSUserDefaults.standardUserDefaults().synchronize()

                self.dismissViewControllerAnimated(true, completion: nil)
            }
        }
    } catch let error as NSError {
        print(error.localizedDescription)
    }

}
task.resume()

}

}

使用未解析的标识符'json'

1 个答案: