Question

我正在使用AFNetworking 3.0。我已使用后台会话成功上传了任务。现在我想根据网络可达性暂停和恢复所有任务。就像没有网络时挂起任务一样，当网络重新连接时恢复任务。

代码：

static AFURLSessionManager *manager;

static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{

    NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:@"wts.Demo-Upload"];
    sessionConfiguration.HTTPMaximumConnectionsPerHost = 20;
    manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:sessionConfiguration];
});

[manager setDidFinishEventsForBackgroundURLSessionBlock:^(NSURLSession * _Nonnull session) {
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    if (appDelegate.backgroundSessionCompletionHandler) {
        void (^completionHandler)() = appDelegate.backgroundSessionCompletionHandler;
        appDelegate.backgroundSessionCompletionHandler = nil;
        completionHandler();
    }

    NSLog(@"All tasks are finished");
}];



NSOperationQueue *operationQueue = manager.operationQueue;

[manager.reachabilityManager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {

    switch (status) {
        case AFNetworkReachabilityStatusNotReachable:
            // we need to notify a delegete when internet conexion is lost.
            // [delegate internetConexionLost];
            NSLog(@"No Internet Conexion");
            break;
        case AFNetworkReachabilityStatusReachableViaWiFi:
            NSLog(@"WIFI");
            break;
        case AFNetworkReachabilityStatusReachableViaWWAN:
            NSLog(@"3G");
            break;
        default:
            NSLog(@"Unkown network status");
            [operationQueue setSuspended:YES];
            break;
    }
}];
    [manager.reachabilityManager startMonitoring];

Answer 1

终于找到了解决方案。首先获取所有上传任务并恢复它。

[manager.reachabilityManager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {

    switch (status) {
        case AFNetworkReachabilityStatusNotReachable:
            NSLog(@"No Internet Connection");
            break;
        case AFNetworkReachabilityStatusReachableViaWiFi:
            NSLog(@"WiFi");
        case AFNetworkReachabilityStatusReachableViaWWAN:
            NSLog(@"3G");
            for (NSURLSessionUploadTask *uploadTask in [manager uploadTasks]) {
                [uploadTask resume];
            }
            break;
        default:
            NSLog(@"Unknown network status");
            [operationQueue setSuspended:YES];
            break;
    }
}];

当app在前台时，上面的代码工作正常。但是当app在后台时，setReachabilityStatusChangeBlock永远不会被调用。任何人都可以知道如何调用可达性块甚至应用程序在后台吗？

在AFNetworking中重新连接网络时，恢复所有上载任务

1 个答案: