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 "RKTStatus.h"

@interface RKTwitterViewController () <UITableViewDelegate, UITableViewDataSource, RKObjectLoaderDelegate>
@property (nonatomic, retain) UITableView *tableView;
@property (nonatomic, retain) NSArray *statuses;
@end

@implementation RKTwitterViewController

@synthesize tableView = _tableView;
@synthesize statuses = _statuses;

- (void)loadView
{
    [super loadView];

    // Setup View and Table View
    self.title = @"RestKit Tweets";
    [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleBlackTranslucent;
    self.navigationController.navigationBar.tintColor = [UIColor blackColor];
    self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:self action:@selector(reloadButtonWasPressed:)] autorelease];

    UIImageView *imageView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"BG.png"]] autorelease];
    imageView.frame = CGRectOffset(imageView.frame, 0, -64);

    [self.view insertSubview:imageView atIndex:0];

    self.tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, 320, 480-64) style:UITableViewStylePlain];
    self.tableView.dataSource = self;
    self.tableView.delegate = self;
    self.tableView.backgroundColor = [UIColor clearColor];
    self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
    [self.view addSubview:self.tableView];

    // Load statuses from core data
    [self loadObjectsFromDataStore];
}

- (void)dealloc
{
    [_tableView release];
    [_statuses release];
    [super dealloc];
}

- (void)loadObjectsFromDataStore
{
    NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"RKTStatus"];
    NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:@"createdAt" ascending:NO];
    fetchRequest.sortDescriptors = @[descriptor];
    NSError *error;
    self.statuses = [[RKManagedObjectStore defaultStore].mainQueueManagedObjectContext executeFetchRequest:fetchRequest error:&error];
}

- (void)loadData
{
    // Load the object model via RestKit
    RKObjectManager *objectManager = [RKObjectManager sharedManager];
    [objectManager loadObjectsAtResourcePath:@"/status/user_timeline/RestKit" delegate:self];
}

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

#pragma mark RKObjectLoaderDelegate methods

- (void)objectLoader:(RKObjectLoader *)objectLoader didLoadObjects:(NSArray *)objects
{
    [[NSUserDefaults standardUserDefaults] setObject:[NSDate date] forKey:@"LastUpdatedAt"];
    [[NSUserDefaults standardUserDefaults] synchronize];
    NSLog(@"Loaded statuses: %@", objects);
    [self loadObjectsFromDataStore];
    [_tableView reloadData];
}

- (void)objectLoader:(RKObjectLoader *)objectLoader didFailWithError:(NSError *)error
{
    UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:@"Error"
                                                     message:[error localizedDescription]
                                                    delegate:nil
                                           cancelButtonTitle:@"OK" otherButtonTitles:nil] autorelease];
    [alert show];
    NSLog(@"Hit error: %@", error);
}

#pragma mark UITableViewDelegate methods

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

#pragma mark UITableViewDataSource methods

- (NSInteger)tableView:(UITableView *)table numberOfRowsInSection:(NSInteger)section
{
    return [_statuses count];
}

- (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] autorelease];
        cell.textLabel.font = [UIFont systemFontOfSize:14];
        cell.textLabel.numberOfLines = 0;
        cell.textLabel.backgroundColor = [UIColor clearColor];
        cell.contentView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"listbg.png"]];
    }
    RKTStatus *status = [_statuses objectAtIndex:indexPath.row];
    cell.textLabel.text = status.text;
    return cell;
}

@end