bme-ios - Messenger

cellForRowAtIndexPath.m

- (UITableViewCell *)tableView:(UITableView *)tableView 
  cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"MessagesCell";
    UITableViewCell *cell = [tableView 
      dequeueReusableCellWithIdentifier:CellIdentifier];
    
    MEMessage* message = [_messages objectAtIndex:indexPath.row];

    cell.textLabel.text = [NSString stringWithFormat:@"%@ - %@", 
      message.fromUser, message.toUser];
    cell.detailTextLabel.text = message.topic;
    
    return cell;
}

composeMessageViewControllerDidSend-HTTPRequest.m

NSURL* url = [NSURL URLWithString:@"http://atleast.aut.bme.hu/ios/messenger/add-message"];
NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:url];
request.HTTPMethod = @"POST";
[request setValue:@"text/xml" forHTTPHeaderField:@"Content-Type"];
    
NSURLSessionConfiguration *sessionConfig = [NSURLSessionConfiguration defaultSessionConfiguration];
    
NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfig
                                                          delegate:nil
                                                     delegateQueue:nil];
    
NSURLSessionUploadTask *postTask = [session uploadTaskWithRequest:request fromData:xml completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        
}];
    
[postTask  resume];

composeMessageViewControllerDidSend-success.m

NSError* xmlError = nil;
DDXMLDocument* xmlDoc = [[DDXMLDocument alloc] 
	initWithXMLData:data options:0 
	error:&xmlError];
        
if (xmlError)
{
    NSLog([xmlError description]);
}
else
{
    dispatch_async(dispatch_get_main_queue(), ^{
         UIAlertView* alertView = [[UIAlertView alloc]
                           initWithTitle: @"A szerver válasza"
                                 message:[xmlDoc.rootElement stringValue]
                                delegate:nil
                       cancelButtonTitle:@"Ok"
                       otherButtonTitles:nil];
         [alertView show];
    });
}

composeMessageViewControllerDidSend.m

- (void)composeMessageViewControllerDidSend:
  (MEComposeMessageViewController *)viewController
{
    DDXMLDocument* document = [[DDXMLDocument alloc]  
      initWithXMLString:@"<message />" options:0 error:nil];
    DDXMLElement* message = [document rootElement];
    
    [message addAttribute:[DDXMLNode attributeWithName:@"from_user" 
      stringValue:kUserName]];
    [message addAttribute:[DDXMLNode attributeWithName:@"to_user" 
      stringValue:viewController.toUserTextField.text]];
    [message addAttribute:[DDXMLNode attributeWithName:@"topic" 
      stringValue:viewController.topicTextField.text]];

    // CDATA elemeket csak trükközéssel támogatja a KissXML
    NSString* contentNodeString = [NSString 
      stringWithFormat:@"<content><![CDATA[%@]]></content>", 
        viewController.contentTextView.text];
    DDXMLElement* contentElement = [[DDXMLDocument alloc] 
      initWithXMLString:contentNodeString options:DDXMLDocumentXMLKind 
      error:nil].rootElement;
    [message addChild:[contentElement copy]];    

    NSData* xml = [document XMLData];
    
    NSLog([[NSString alloc] initWithData:xml 
      encoding:NSUTF8StringEncoding]);
}

foundCDATA.m

- (void)parser:(NSXMLParser *)parser foundCDATA:(NSData *)CDATABlock
{
    NSString* currentElementName = [_currentXmlElements lastObject];
    if ([currentElementName isEqualToString:@"content"])
    {
        MEMessage* message = [self.messages lastObject];
        message.content = 
          [[NSString alloc] initWithData:CDATABlock 
          encoding:NSUTF8StringEncoding];
    }
}

imageRequest.m

__weak UITableViewCell *weakCell = cell;
NSURL* imageUrl = [NSURL URLWithString:message.imageUrl];
    
// nem ideális megoldás, mert minden alkalommal újra letölti a képet, ha egy cella megjelenik
// egy éles alkalmazásban a képek letöltését és tárolását mindenképp külön kell kezelni
NSURLSessionDataTask* imageDownloadTask = [_urlSession dataTaskWithURL:imageUrl completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    dispatch_async(dispatch_get_main_queue(), ^{
        UIImage* image = [UIImage imageWithData:data];
        weakCell.imageView.image = image;
        [weakCell setNeedsLayout];
    });
}];
[imageDownloadTask resume];

parserDidStartElement.m

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
    if ([elementName isEqualToString:@"message"])
    {
        MEMessage* message = [[MEMessage alloc] init];
        message.fromUser = [attributeDict objectForKey:@"from_user"];
        message.toUser = [attributeDict objectForKey:@"to_user"];
        message.topic = [attributeDict objectForKey:@"topic"];
        message.imageUrl = [attributeDict objectForKey:@"imageuri"];
        
        [self.messages addObject:message];
    }
    
    [_currentXmlElements addObject:elementName];
}

refreshButtonClick.m

- (IBAction)refreshButtonClick:(id)sender
{
    NSURLSessionDataTask *xmlDataTask = [_urlSession dataTaskWithURL:[NSURL URLWithString:@"http://atleast.aut.bme.hu/ios/messenger/messages"] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {        
        NSLog([[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
    }];
    
    [xmlDataTask  resume];
}