Почему ASINetworkQueue и ASIHTTPRequest блокируют основной поток?

Question

Когда это работает, мой пользовательский интерфейс замерзает. Это в значительной степени из документации:

- (void)doNetworkOperations 
{ 
    [[self networkQueue] cancelAllOperations]; 

    [self setNetworkQueue:[ASINetworkQueue queue]]; 
    [[self networkQueue] setMaxConcurrentOperationCount:8]; 
    [[self networkQueue] setDelegate:self]; 
    [[self networkQueue] setRequestDidFinishSelector:@selector(requestFinished:)]; 
    [[self networkQueue] setQueueDidFinishSelector:@selector(queueFinished:)]; 
    [[self networkQueue] setRequestDidFailSelector:@selector(requestFailed:)]; 


    ASIHTTPRequest *request01 = [self loadTodaysNews]; 
    ASIHTTPRequest *request02 = [self loadFoodItems]; 
    ASIHTTPRequest *request03 = [self loadFarms]; 
    ASIHTTPRequest *request04 = [self loadMobileSections]; 
    ASIHTTPRequest *request05 = [self loadThymeLinks]; 
    ASIHTTPRequest *request06 = [self loadFoodCategories]; 
    ASIHTTPRequest *request07 = [self deleteDeletedRecords]; 


    [[self networkQueue] addOperation:request01]; 
    [[self networkQueue] addOperation:request02]; 
    [[self networkQueue] addOperation:request03]; 
    [[self networkQueue] addOperation:request04]; 
    [[self networkQueue] addOperation:request05]; 
    [[self networkQueue] addOperation:request06]; 
    [[self networkQueue] addOperation:request07]; 

    [[self networkQueue] go]; 
} 

и вот пример запроса:

- (ASIHTTPRequest *) loadTodaysNews 
{ 
    NSString* urlString = @"http://xxx.xxx.xxx/ra/NewsItem.json"; 
    // 0. Setup URL 
    if(self.settings.lastNewsTimestamp != nil){ 
     [NSDateFormatter setDefaultFormatterBehavior:NSDateFormatterBehavior10_4]; 
     NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; 
     [dateFormatter setDateFormat:@"MMddyyHHmm"]; 

     urlString=[urlString stringByAppendingFormat:@"?lastmoddate=%@", [dateFormatter stringFromDate:self.settings.lastNewsTimestamp]]; 
     [dateFormatter release];   
    } 



    // 1. Fetch 
     NSURL* url = [NSURL URLWithString:urlString]; 
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url]; 


    [request setCompletionBlock:^(void) { 
     [NSThread detachNewThreadSelector: @selector(spinBegin) toTarget:self withObject:nil]; 


     NSString *responseString = [request responseString]; 
     // 3. parse the response 
     NSArray *responseDict = [responseString objectFromJSONString]; 

     for(int i=0;i<responseDict.count;i++){ 
      NSDictionary *itemDict = (NSDictionary *)[responseDict objectAtIndex:i]; 


      NSPredicate* predicate = [NSPredicate predicateWithFormat:@"(extID == %@)", [[itemDict objectForKey:@"id"]description]]; 
      NSMutableArray * mutableFetchResults = [CoreDataHelper searchObjectsInContext:@"NewsItem" :predicate:@"name" :YES : self.managedObjectContext]; 

      NewsItem* item = nil; 
      if(mutableFetchResults == nil || mutableFetchResults.count == 0){ 
       item = [NSEntityDescription 
            insertNewObjectForEntityForName:@"NewsItem" 
            inManagedObjectContext:self.managedObjectContext]; 

      } else { 
       //Edit or Delete 
       item = [mutableFetchResults objectAtIndex:0]; 
      } 
      if([[[itemDict objectForKey:@"publish"]description]isEqualToString:@"1"]){ 
       //edit 

       item.name = [itemDict objectForKey:@"name"]; 
       item.textDescription = [itemDict objectForKey:@"textDescription"]; 
       if([itemDict objectForKey:@"newsCategory"]!= [NSNull null]){ 
        item.section = [[itemDict objectForKey:@"newsCategory"] objectForKey:@"name"]; 
       } 

       item.timeStamp = [NSDate date]; 
      }else{ 
       //unpublish/delete 
       [self.managedObjectContext deleteObject:item]; 

      } 
     } 
     NSError* error = nil; 
     if (![self.managedObjectContext save:&error]) { 
      NSLog(@"Error %@",error); 
     } 

     //send a reload message? 
     [self.newsViewController.tableView reloadData]; 
     [NSThread detachNewThreadSelector: @selector(spinEnd) toTarget:self withObject:nil]; 

    }]; 

    return request; 

// [request startAsynchronous]; 
} 

Что мне не хватает? Спасибо

Answer 1

Важно: вы должны выполнять только действия пользовательского интерфейса на mainthread!

может быть, это может помочь:

[self.newsViewController.tableView performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:YES];