gonzalezreal

// Este código crea una referencia circular entre 'operation' y self

self.operation = [NSBlockOperation blockOperationWithBlock:^{
    [self doSomething];
}];

// Para evitarlo tenemos pasarle al bloque una referencia débil a self

typeof(self) __weak w_self = self;

gonzalezreal

#import <UIKit/UIKit.h>

@class TGRTweet;
@class TGRProfileImageView;

@interface TGRTweetCell : UITableViewCell

@property (strong, nonatomic) TGRProfileImageView *profileImageView;
@property (strong, nonatomic) UILabel *nameLabel;
@property (strong, nonatomic) UILabel *dateLabel;

gonzalezreal

NSFetchedResultsController *frc = [[NSFetchedResultsController alloc] initWithFetchRequest:[TGRTweet fetchRequestForAllTweets]
                                                                          managedObjectContext:managedObjectContext
                                                                            sectionNameKeyPath:nil
                                                                                     cacheName:nil];

gonzalezreal

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = ...;
    TGRTweet *tweet = [self.fetchedResultsController objectAtIndexPath:indexPath];
    
    // Configuramos la celda usando los atributos del tweet
    // ...
    
    return cell;
}

gonzalezreal

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return [[self.fetchedResultsController sections] count];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [[[self.fetchedResultsController sections] objectAtIndex:section] numberOfObjects];
}

gonzalezreal

#import "TGRTweetCell.h"

.
.
.

- (void)viewDidLoad
{
    [super viewDidLoad];
    

gonzalezreal

#import <UIKit/UIKit.h>

@interface TGRProfileImageView : UIView

- (void)setProfileImageURL:(NSURL *)url;
- (void)cancelCurrentImageLoad;

@end

gonzalezreal

+ (ACAccountStore *)tgr_sharedAccountStore
{
    static dispatch_once_t onceToken;
    static ACAccountStore *accountStore;
    
    dispatch_once(&onceToken, ^{
        accountStore = [[ACAccountStore alloc] init];
    });
    
    return accountStore;

gonzalezreal

//
//  TGRProfileImageView.m
//  TwitterTimeline
//
//  Created by guille on 27/10/12.
//  Copyright (c) 2012 Guillermo Gonzalez. All rights reserved.
//

#import "TGRProfileImageView.h"
#import "SDWebImageManagerDelegate.h"

gonzalezreal

- (void)controller:(NSFetchedResultsController *)controller
   didChangeObject:(id)anObject
	   atIndexPath:(NSIndexPath *)indexPath
	 forChangeType:(NSFetchedResultsChangeType)type
	  newIndexPath:(NSIndexPath *)newIndexPath
{
    // Aquí podemos utilizar los métodos de UITableView para
    // actualizar nuestra tabla
}