UICollectionView not showing

//
//  ViewController.m
//  Events
//
//  Created by Lukas Orgovan on 11/5/12.
//  Copyright (c) 2012 Lukas Orgovan. All rights reserved.
//

#import "ViewController.h"
#import "DetailViewController.h"
#import "CollectionViewCell.h"

@interface ViewController ()



@end

@implementation ViewController


@synthesize xmlParser = _xmlParser;
@synthesize currentEvent = _currentEvent;
@synthesize currentString = _currentString;
@synthesize storeCharacters = _storeCharacters;
@synthesize eventsArray = _eventsArray;
@synthesize recievedData = _recievedData;
- (void)viewDidLoad
{
    [super viewDidLoad];
    [_spinner startAnimating];

    // Create the request.
    NSURLRequest *theRequest=[NSURLRequest requestWithURL:       [NSURL URLWithString:@"http://www.90bpm.sk/feeds/iphone.xml"]
                                              cachePolicy:NSURLRequestUseProtocolCachePolicy
                                      timeoutInterval:60.0];
    // create the connection with the request
    // and start loading the data
    NSURLConnection *theConnection=[[NSURLConnection alloc]  initWithRequest:theRequest delegate:self];
    if (theConnection) {
        // Create the NSMutableData to hold the received data.
        // receivedData is an instance variable declared elsewhere.
        self.recievedData = [NSMutableData data];
    } else {
    // Inform the user that the connection failed.
   }


}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// do something with the data
// receivedData is declared as a method instance elsewhere
NSLog(@"Succeeded! Received %d bytes of data",[self.recievedData length]);
[_spinner stopAnimating];
// release the connection, and the data object
self.xmlParser = [[NSXMLParser alloc] initWithData:self.recievedData];
self.xmlParser.delegate = self;
self.eventsArray = [NSMutableArray array];
self.currentString = [NSMutableString string];
[self.xmlParser parse];

}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
// This method is called when the server has determined that it
// has enough information to create the NSURLResponse.

// It can be called multiple times, for example in the case of a
// redirect, so each time we reset the data.

// receivedData is an instance variable declared elsewhere.
[self.recievedData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// Append the new data to receivedData.
// receivedData is an instance variable declared elsewhere.
[self.recievedData appendData:data];
}
- (void)connection:(NSURLConnection *)connection
didFailWithError:(NSError *)error
{
// release the connection, and the data object

// receivedData is declared as a method instance elsewhere


// inform the user
NSLog(@"Connection failed! Error - %@ %@",
      [error localizedDescription],
      [[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);
}


#pragma mark -
#pragma mark SEGUE !!!

- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ( [[segue identifier] isEqualToString:@"showDetails"] ) {

    NSIndexPath *indexPath = [[self.collectionView indexPathsForSelectedItems] lastObject];
    NSLog(@"%d", indexPath.row);

    DetailViewController *dvc = (DetailViewController *) [segue destinationViewController];
    //dvc.detail = [self.eventsArray objectAtIndex:(indexPath.row)];
    dvc.detail = [self.eventsArray objectAtIndex:indexPath.row];


}
}



#pragma mark -
#pragma mark UICollectionViewDataSource!!!

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
return 1;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return [self.eventsArray count];
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    CollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];
    Event *event = [self.eventsArray objectAtIndex:(indexPath.section*2 + indexPath.row)];
    cell.label.text = event.title;
    cell.imageView.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:event.image]]];
    return cell;
}

#pragma mark - 
#pragma mark Parser Delegate

static NSString *kName_Event = @"item";
static NSString *kName_Title = @"title";
static NSString *kName_Body = @"description";
static NSString *kname_Image = @"image";
static NSString *kName_Link = @"link";
- (void) parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict {

if ([elementName isEqualToString:kName_Event]) {
    self.currentEvent = [[Event alloc] init];
    self.storeCharacters = NO;
}
else if ([elementName isEqualToString:kName_Title] || [elementName isEqualToString:kname_Image] || [elementName isEqualToString:kName_Body] || [elementName isEqualToString:kName_Link]) {
    [self.currentString setString:@""];
    self.storeCharacters = YES;
}
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
if (self.storeCharacters)
    [self.currentString appendString:string];
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {

if ([elementName isEqualToString:kName_Title]) {
    self.currentEvent.title = _currentString;


}
else if ([elementName isEqualToString:kname_Image]) {
    self.currentEvent.image = _currentString;

}
else if ([elementName isEqualToString:kName_Link]) {
   self.currentEvent.link = _currentString;

}
else if ([elementName isEqualToString:kName_Body]) {
   self.currentEvent.body = _currentString;

}
if ([elementName isEqualToString:kName_Event]) {
    [self finishedCurrentEvent: _currentEvent];
}
self.storeCharacters = NO;
}
- (void) finishedCurrentEvent:(Event *)e {
    [self.eventsArray addObject:e];
    self.currentEvent = nil;
}

- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError {
    //postarj sa o errory pri parsovani
}

- (void)parserDidEndDocument:(NSXMLParser *)parser {
    NSLog(@"pocet vyparsovanych itemov / elementov: %d", _eventsArray.count);
    Event *eevveenntt = self.eventsArray[0];
    NSLog(@"konkretne: %@", eevveenntt.title);
}


- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end