实例成员不能在类型|上使用关闭 [英] Instance member cannot be used on type | Closures

问题描述

我有一个非常简单的 NSViewController ，它使用 WeatherFetcher 类命中一个API。它将完成处理程序作为参数传递，以便HTTP API在完成后可以调用它。

I have a very simple NSViewController , which hits an API using a WeatherFetcher class. It passes a completion handler as a parameter, so that the HTTP API can call it once it finishes.

在这个完成处理程序中，我试图为API的结果设置一个简单的 NSTextField 的值。但是，我得到这个错误：
实例成员'currentTemp'不能用于类型'WeatherView'

In this completion handler, I am trying to set the value of a simple NSTextField to the result of API. However, I am getting this error: Instance member 'currentTemp' cannot be used on type 'WeatherView'

任何想法是什么问题？

Any idea what is wrong?

class WeatherView: NSViewController {

    var weather:Weather?

    @IBOutlet weak var currentTemp: NSTextField!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do view setup here.

        WeatherFetcher.fetchCurrent(currentWeatherCallback)

    }

    override var nibName : String{
        return "WeatherView"
    }

    var currentWeatherCallback =
    {
        (weather: Weather?) in

        currentTemp.stringValue = weather?.updatedTime
        // Instance member 'currentTemp' cannot be used on type 'WeatherView'

    }


}

推荐答案

初始化属性时，您无权访问实例作用域，只能访问静态上下文。

You don't have access to the instance scope when initialising properties, you can only access the static context.

试试这个：

var currentWeatherCallback: Weather? -> Void { return
    { (weather: Weather?) in
        self.currentTemp.stringValue = weather?.updatedTime
    }
}

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