RestKit/Examples/RKTwitterCoreData/Classes/RKTwitterViewController.m

//
//  RKTwitterViewController.m
//  RKTwitter
//
//  Created by Blake Watters on 9/5/10.
//  Copyright (c) 2009-2012 RestKit. All rights reserved.
//

#import "RKTwitterViewController.h"
#import "RKTweet.h"

static void RKTwitterShowAlertWithError(NSError *error)
{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
                                                     message:[error localizedDescription]
                                                    delegate:nil
                                           cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert show];
}

@interface RKTwitterViewController () <UITableViewDelegate, UITableViewDataSource, NSFetchedResultsControllerDelegate>
@property (nonatomic, weak) IBOutlet UITableView *tableView;
@property (nonatomic, strong) NSFetchedResultsController *fetchedResultsController;
@end

@implementation RKTwitterViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    // Set debug logging level. Set to 'RKLogLevelTrace' to see JSON payload
    RKLogConfigureByName("RestKit/Network", RKLogLevelDebug);

    // Setup View and Table View
    self.title = @"RestKit Tweets";

    NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"Tweet"];
    NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:@"createdAt" ascending:NO];
    fetchRequest.sortDescriptors = @[descriptor];
    NSError *error = nil;

    // Setup fetched results
    self.fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest
                                                                        managedObjectContext:[RKManagedObjectStore defaultStore].mainQueueManagedObjectContext
                                                                          sectionNameKeyPath:nil
                                                                                   cacheName:nil];
    [self.fetchedResultsController setDelegate:self];
    BOOL fetchSuccessful = [self.fetchedResultsController performFetch:&error];
    NSAssert([[self.fetchedResultsController fetchedObjects] count], @"Seeding didn't work...");
    if (! fetchSuccessful) {
        RKTwitterShowAlertWithError(error);
    }

    [self loadData];
}


- (void)loadData
{
    // Load the object model via RestKit
    [[RKObjectManager sharedManager] getObjectsAtPath:@"/status/user_timeline/RestKit" parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
        RKLogInfo(@"Load complete: Table should refresh...");

        [[NSUserDefaults standardUserDefaults] setObject:[NSDate date] forKey:@"LastUpdatedAt"];
        [[NSUserDefaults standardUserDefaults] synchronize];
    } failure:^(RKObjectRequestOperation *operation, NSError *error) {
        RKLogError(@"Load failed with error: %@", error);

        RKTwitterShowAlertWithError(error);
    }];
}

- (IBAction)refresh:(id)sender
{
    // Load the object model via RestKit
    [self loadData];
}

#pragma mark UITableViewDelegate methods

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    RKTweet *status = [self.fetchedResultsController objectAtIndexPath:indexPath];
    CGSize size = [[status text] sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:CGSizeMake(300, 9000)];
    return size.height + 10;
}

#pragma mark UITableViewDataSource methods

- (NSInteger)tableView:(UITableView *)table numberOfRowsInSection:(NSInteger)section
{
    id<NSFetchedResultsSectionInfo> sectionInfo = [self.fetchedResultsController.sections objectAtIndex:section];
    return [sectionInfo numberOfObjects];
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    NSDate *lastUpdatedAt = [[NSUserDefaults standardUserDefaults] objectForKey:@"LastUpdatedAt"];
    NSString *dateString = [NSDateFormatter localizedStringFromDate:lastUpdatedAt dateStyle:NSDateFormatterShortStyle timeStyle:NSDateFormatterMediumStyle];
    if (nil == dateString) {
        dateString = @"Never";
    }
    return [NSString stringWithFormat:@"Last Load: %@", dateString];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *reuseIdentifier = @"Tweet Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reuseIdentifier];
    if (nil == cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reuseIdentifier];
        cell.textLabel.font = [UIFont systemFontOfSize:14];
        cell.textLabel.numberOfLines = 0;
        cell.textLabel.backgroundColor = [UIColor clearColor];
        cell.contentView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"listbg.png"]];
    }
    RKTweet *status = [self.fetchedResultsController objectAtIndexPath:indexPath];
    cell.textLabel.text = status.text;
    return cell;
}

#pragma mark NSFetchedResultsControllerDelegate methods

- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
{
    [self.tableView reloadData];
}

@end