swift - Alamofire 导致 iPhone 5 崩溃

Question

我目前允许一些用户通过 TestFlight 访问我的应用程序，以便他们可以对其进行测试。在每部 iPhone 上，该应用程序都能完美运行，没有任何问题，但在 iPhone 5 上，该应用程序每次都会崩溃。在 xCode 模拟器中，一切正常，但在真实设备上却不行。

看起来是 Alamofire 导致了崩溃。问题出在 Alamofire>Source>Features>ResponseSerialization.swift>response(queue:completionHandler:)

这是函数的代码:

/// Adds a handler to be called once the request has finished.
///
/// - parameter queue:             The queue on which the completion handler is dispatched.
/// - parameter completionHandler: The code to be executed once the request has finished.
///
/// - returns: The request.
@discardableResult
public func response(queue: DispatchQueue? = nil, completionHandler: @escaping (DefaultDataResponse) -> Void) -> Self {
    delegate.queue.addOperation {
        (queue ?? DispatchQueue.main).async {
            var dataResponse = DefaultDataResponse(
                request: self.request,
                response: self.response,
                data: self.delegate.data,
                error: self.delegate.error
            )

            dataResponse.add(self.delegate.metrics)

            completionHandler(dataResponse)
        }
    }

    return self
}

completionHandler(dataResponse) 看起来就是问题所在。

下面还有xCode的截图

这是与 Alamofire 相关的问题吗？因为在所有其他设备(5s、6 Plus、7 Plus、SE 和 7)上它都可以正常工作。崩溃发生在 iPhone 连接到 WiFi 和使用移动网络时。

感谢任何提示!

编辑:这应该是启动应用程序时调用的代码部分:

Alamofire.request("https://app.site.tld/mobile/ios", parameters: parameters).response { response in
        print("Request: \(response.request)")
        print("Response: \(response.response)")
        print("Error: \(response.data)")

        if response.response != nil{
            if let data = response.data, let utf8Text = String(data: data, encoding: .utf8) {
                print("Data: \(utf8Text)")

                let weatherDataArr = utf8Text.components(separatedBy: "~")
                guard let hash = String(weatherDataArr[0]) else {
                    completion(nil)
                    return
                }
                do {
                    //working with received data.
                    //let currData: wData = try wData(hash: hash, ....)

                    completion(currData)
                } catch {
                    print("error creating Object: \(error)")
                    completion(nil)
                }

            }
            else {
                completion(nil)
            }
        }else {
            completion(nil)
        }
    }

刚刚在 xCode 中发现一条警告:

'catch' block is unreachable because no errors are thrown in 'do' block

Answer 1

首先简化以消除困惑

Alamofire.request("https://app.site.tld/mobile/ios", parameters: parameters).response { response in
    print("Request: \(response.request)")
    print("Response: \(response.response)")
    print("Error: \(response.data)")

    var result: wData? = nil
    defer { completion(result) }

    guard response.response != nil else { return }

    if let data = response.data, let utf8Text = String(data: data, encoding: .utf8) {
        print("Data: \(utf8Text)")

        let weatherDataArr = utf8Text.components(separatedBy: "~")

        guard let hash = String(weatherDataArr[0]) else { return }

        //working with received data.
        //let currData: wData = try wData(hash: hash, ....)

        result = currData
    }
}

然后我们可以问问自己

1. 您如何 100% 确定 weatherDataArr 中有元素？如果没有，使用 guard let hash = weatherDataArr.first else { return }
2. //working with received data. 会发生什么？