由于“内部”保护级别，无法访问“值” [英] 'value' is inaccessible due to 'internal' protection level

问题描述

设置openweathermap的API。但是，要进行以下设置：

Setting up API for openweathermap. However, when it comes to setting up this:

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        let location  = locations[0]
        lat = location.coordinate.latitude
        lon = location.coordinate.longitude
        AF.request("http://api.openweathermaps.org/data/2.5/weather?lat=\(lat)&lon=\(lon)&appid=\(apiKey)&units=metric").responseJSON {
            response in
            self.activityIndicator.stopAnimating()
            if let responseStr = response.result.value {
                let jsonResponse = JSON(responseStr)
                let jsonWeather  = jsonResponse["weather"].array![0]
                let jsonTemp = jsonResponse["main"]
                let iconName =  jsonWeather["icon"].stringValue
            }
        }

    }

我收到错误：

'值'由于内部保护级别而无法访问

'value' is inaccessible due to 'internal' protection level

推荐答案

感谢尝试Alamofire 5！这个错误有点让人误解，因为Swift编译器试图提供帮助，并让您知道存在内部属性 value 在您无法访问的 response.result 上。但是，这是内部的Alamofire扩展，因为我们移至 Alamofire 5 beta 4中Swift标准库提供的 Result 类型。系统 Result 不提供Alamofire先前提供的结果值和错误属性c $ c>类型做了。因此，尽管我们内部有一些扩展可以为我们提供功能，但它们并不公开存在供您的应用使用。

Thanks for trying Alamofire 5! This error is a bit misleading, as the Swift compiler is trying to be helpful and letting you know there's an internal property value on response.result that you can't access. However, this is an internal Alamofire extension, as we moved to the Result type provided by the Swift standard library in Alamofire 5 beta 4. The system Result does not offer the the value and error properties that Alamofire's previously provided Result type did. So while we have extensions internally to provide functionality to us, they do not exist publicly for use by your app.

最终的解决方案取决于您。您可以自己扩展 Result 以提供属性（随意使用Alamofire实现），也可以不使用属性和 switch response.result 值上加上$ c>以提取响应值。我建议暂时使用 switch ，因为它会迫使您考虑 .failure 的情况。

The ultimate solution here is up to you. You can extend Result yourself to offer the properties (feel free to use the Alamofire implementation) or you can do without the properties and switch over the response.result value to extract the response value. I would suggest using switch for now, as it forces you to consider the .failure case.

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