尝试后台获取期间出现AFNetworking错误53

Question

在更新我的应用程序以支持后台应用程序刷新时，我遇到了AFNetworking问题。

我越来越NSPOSIXErrorDomain Code=53 "Software caused connection abort"。该问题似乎发生在iOS 12中，其中后台连接被终止。

AFNetworking 2.6.3用于进行提取。

AppDelegate.m：

- (void)application:(UIApplication *)application performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {
    [OrdersService performFetch];
    completionHandler(UIBackgroundFetchResultNewData);
}

OrdersService.m：

-(void) performFetch {
    [[AFHTTPRequestOperationManager new] GET:@"https://www.example.com/orders"
        parameters:nil
           success:^(AFHTTPRequestOperation *operation, id responseObject) {

           }
           failure:^(AFHTTPRequestOperation *operation, NSError *error) {

           }
    ];
}

控制台输出：

[错误] GET'（null）'（0）[31.9163 s]：错误域= NSPOSIXErrorDomain代码= 53“软件导致连接中止” UserInfo = {NSErrorFailingURLStringKey = https://www.example.com/orders，_kCFStreamErrorDomainKey = 1 ，NSErrorPeerAddressKey = {长度= 16，容量= 16，字节= 0x100201bb3e80187c0000000000000000}，_ kCFStreamErrorCodeKey = 53，NSErrorFailingURLKey = https://www.example.com/orders }

Answer 1

以0.1秒的延迟启动作为后台任务的获取，可以解决此问题：

-(void) performFetch {
    __block UIBackgroundTaskIdentifier bgTask = [[UIApplication sharedApplication] beginBackgroundTaskWithName:@"GET /orders" expirationHandler:^{
        // EXPIRED
        [[UIApplication sharedApplication] endBackgroundTask:bgTask];
        bgTask = UIBackgroundTaskInvalid;
    }];

    // Start the long-running task and return immediately.
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 0.1 * NSEC_PER_SEC), dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

        // Do the work associated with the task, preferably in chunks.
        [[AFHTTPRequestOperationManager new] GET:@"https://www.example.com/orders"
                        parameters:nil
                           success:^(AFHTTPRequestOperation *operation, id responseObject) {
                               // SUCCESS
                               [[UIApplication sharedApplication] endBackgroundTask:bgTask];
                               bgTask = UIBackgroundTaskInvalid;
                           }
                           failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                               // FAILURE
                               [[UIApplication sharedApplication] endBackgroundTask:bgTask];
                               bgTask = UIBackgroundTaskInvalid;
                           }
        ];
    });
}