iOS 后台进程和 AFNetworking

Question

我有一个从网络服务加载一些数据的应用程序。一切都很好。

现在我想在后台进程中更新数据。编写了该部分，我可以通过在 Xcode 中使用“模拟后台获取”调试过程来启动它。
我的问题是 AFHTTPRequestOperation 中的 block 没有被执行。我敢打赌我不想要这里的 block ，但是
a) 我想知道为什么它不会执行 - 我的猜测是你不能在后台提取中像这样分离 block 。
b) 我不知道如何在这里不使用 block 。

如有任何帮助，我们将不胜感激。

    - (void) callWebServiceUpdate {

    //Delete tmpDatabase if it is there
    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL success;
    success = [fileManager fileExistsAtPath:self.tmpEmployeeDatabasePath];
    if (success) {
        [fileManager removeItemAtPath:self.tmpEmployeeDatabasePath error:nil];
    }

    //Write data to temp database
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    manager.requestSerializer = [AFJSONRequestSerializer serializer];
    [manager.requestSerializer setAuthorizationHeaderFieldWithUsername:@"USER" password:@"PASSWORD"];
    manager.responseSerializer = [AFJSONResponseSerializer serializer];

    AFHTTPRequestOperation *operationNow = [manager GET: @"https://xxxxxxxxx/mobile/mobilede.nsf/restServices.xsp/LotusDirectoryPeople"
                                          parameters: [self jsonDict]
                                             success: ^(AFHTTPRequestOperation *operation, id responseObject)

                                         {
                                             NSMutableArray  *employees = (NSMutableArray *)responseObject;
                                             FMDatabase *db = [FMDatabase databaseWithPath:self.tmpEmployeeDatabaseName];
                                             [db open];
                                             for(NSDictionary *dict in employees)
                                             {
                                                 BOOL success =   [db executeUpdate:@"INSERT INTO tmpemployees (id,firstName,lastName,fullName,email) VALUES (?,?,?,?,?);",
                                                                   [dict objectForKey:@"clockNumber"],
                                                                   [dict objectForKey:@"firstName"],
                                                                   [dict objectForKey:@"lastName"],
                                                                   [dict objectForKey:@"fullName"],
                                                                   [dict objectForKey:@"email"],
                                                                   nil];
                                                 if (success) {} // Only to remove success error
                                             }
                                         }

                                             failure:^(AFHTTPRequestOperation *operation, NSError *error)
                                         {NSLog(@"Error: %@", error);}
                                         ];
    [operationNow start];

    //Loop through the tmp db and see if we have a value to update or add
    //id tmpDatabasePath = [(AppDelegate *)[[UIApplication sharedApplication] delegate] databasePath];
    NSMutableArray *tmpEmployees;
    tmpEmployees = [[NSMutableArray alloc] init];

    FMDatabase *tmpDatabase = [FMDatabase databaseWithPath:self.tmpEmployeeDatabasePath];
    [tmpDatabase open];

    //id realDatabasePath = [(AppDelegate *)[[UIApplication sharedApplication] delegate] databasePath];
    FMDatabase *realDatabase = [FMDatabase databaseWithPath:self.employeeDatabasePath];
    [realDatabase open];


    FMResultSet *results = [tmpDatabase executeQuery:@"SELECT * FROM employees"];
    while([results next])
    {
        employee *thisEmployee      = [employee new];
        thisEmployee.firstName      = [results stringForColumn:@"firstName"];
        thisEmployee.lastName       = [results stringForColumn:@"lastName"];
        thisEmployee.fullName       = [results stringForColumn:@"fullname"];
        thisEmployee.city           = [results stringForColumn:@"city"];
        thisEmployee.ste            = [results stringForColumn:@"state"];
        thisEmployee.emailAddress   = [results stringForColumn:@"email"];

        NSString *tst = [results stringForColumn:@"id"];
        thisEmployee.id    = [NSNumber numberWithInt:[tst intValue]];

        //See if we have a record
        FMResultSet *results = [realDatabase executeQuery:@"SELECT * from db where id= ?",thisEmployee.id];




    }
    [tmpDatabase close];
}

======================================

下面的海报是正确的。我添加了这段代码:

NSURLSessionConfiguration *backgroundConfiguration = [NSURLSessionConfiguration backgroundSessionConfiguration:@"background"];
AFURLSessionManager *backgroundManager = [[AFURLSessionManager alloc] initWithSessionConfiguration:backgroundConfiguration];

但是，我不明白如何将我的 JSON URL 请求添加到 AFURLSessionManager。

Answer 1

我不知道 AFNetworking 的内部结构，但后台获取需要使用 NSURLSession 和 NSURLSessionDownloadTask 对象来完成。检查您调用的函数是否在内部使用适当的类 - 在正常操作中工作正常的方法可能只是拒绝在后台获取模式下工作。

在简要查看了 AFNetworking 文档之后，我认为您可能需要设置一个 AFURLSessionManager 的实例来配置后台获取。