使用 AFHTTPSessionManager 时内存泄漏

Question

环境：

iOS13/iOS10
Xcode11.1
AFNetworking 版本：3.2.1
Swift 4.2

说明：当使用 AFNetworking post 或获取 Json 数据时，会导致内存泄漏，我创建了一个 AFHTTPSessionManager 是这样的：

private static func ConfigureAFManager(requestSerialization: HttpSerializationType = HttpSerializationType.HTTP,
                                           responseSerialization: HttpSerializationType = HttpSerializationType.JSON,
                                           timeout: TimeInterval = 30,
                                           headers: [String: String]? = nil
                                           ) -> AFHTTPSessionManager {
        let AFManager = AFHTTPSessionManager()
        if requestSerialization == .JSON {
            AFManager.requestSerializer = AFHTTPRequestSerializer()
        }
        if responseSerialization == .HTTP {
            AFManager.responseSerializer = AFHTTPResponseSerializer()
        }
        for (key, value) in headers ?? [:] {
            AFManager.requestSerializer.setValue(value, forHTTPHeaderField: key)
        }

        AFManager.requestSerializer.timeoutInterval = timeout;
        return AFManager
    }

然后我用它来执行post动作：

static func POST(httpURL: String,
                     parameter: Any?,
                     timeout: TimeInterval = 30,
                     headers: [String: String]? = nil,
                     requestSerialization: HttpSerializationType = HttpSerializationType.HTTP,
                     responseSerialization: HttpSerializationType = HttpSerializationType.JSON,
                     success: ((Any?) -> Void)?,
                     fail: ((Error?) -> Void)?) -> Void
    {
        let AFManager = self.ConfigureAFManager(requestSerialization: requestSerialization, responseSerialization: responseSerialization, timeout: timeout, headers: headers)
        AFManager.post(httpURL, parameters: parameter, progress: nil, success: { (task, response) in
            success?(response)
        }) { (task, error) in
            fail?(error)
        }
    }

当我点击Xcode上的Debug Memory Graph时，我发现，AFHTTPSessionManager和__NSURLSessionLocal之间有一些循环引用。

Cycle reference 这是否仅在 AFNetworking 的 3.2.1 版本中发生？

Answer 1

我知道为什么，因为 AFNetWorking 使用 URLSession 它的委托将建立一个强引用，所以在使用 AFHttpSessionManager 之后应该调用 invalidateSessionCancelingTasks

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