使用 AFHTTPSessionManager 时的内存泄漏

Question

环境：

1. iOS 13/iOS 10
2. Xcode 11.1
3. AFNetworking 版本：3.2.1
4. 斯威夫特 4.2

说明：使用 AFNetworking 发布或获取 Json 数据时，会导致内存泄漏，我创建了一个 AFHTTPSessionManager 如下：

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
    }

然后我用它来执行后期操作：

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)
        }
    }

当我在 Xcode 上单击Debug Memory Graph时，我发现AFHTTPSessionManager和__NSURLSessionLocal之间存在一些循环引用。

循环参考是否仅在 AFNetworking 3.2.1 版本中发生这种情况？

Answer 1

我知道为什么，因为 AFNetWorking 使用 URLSession 它的委托会建立一个强引用，所以使用 AFHttpSessionManager 后应该调用 invalidateSessionCancelingTasks