RootViewController.m

gistfile1.m

//
//  RootViewController.m
//  Locations
//
//  Created by Rhys Powell on 8/09/11.
//  Copyright (c) 2011 __MyCompanyName__. All rights reserved.
//

#import "RootViewController.h"
#import "Event.h"

@implementation RootViewController

@synthesize eventsArray, managedObjectContext, addButton, locationManager;

- (CLLocationManager *)locationManager {
    
    if (locationManager != nil) {
        return locationManager;
    }
    
    locationManager = [[CLLocationManager alloc] init];
    locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
    locationManager.delegate = self;
    
    return locationManager;
}

- (void)locationManager:(CLLocationManager *)manager
    didUpdateToLocation:(CLLocation *)newLocation
           fromLocation:(CLLocation *)oldLocation {
    addButton.enabled = YES;
}

- (void)locationManager:(CLLocationManager *)manager
       didFailWithError:(NSError *)error {
    addButton.enabled = NO;
}

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    
    // Release any cached data, images, etc that aren't in use.
}

- (void)addEvent
{
    CLLocation *location = [locationManager location];
    if (!location) {
        return;
    }
    
    Event *event = (Event *)[NSEntityDescription insertNewObjectForEntityForName:@"Event"
                                                          inManagedObjectContext:managedObjectContext];
    
    CLLocationCoordinate2D coordinate = [location coordinate];
    [event setLatitude:[NSNumber numberWithDouble:coordinate.latitude]];
    [event setLongitiude:[NSNumber numberWithDouble:coordinate.longitude]];
    [event setCreationDate:[NSDate date]];
    
    NSError *error = nil;
    if (![managedObjectContext save:&error]) {
        // Handle the error.
    }
    
    [eventsArray insertObject:event atIndex:0];
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
    [self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] 
                          withRowAnimation:UITableViewRowAnimationFade];
    [self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]
                          atScrollPosition:UITableViewScrollPositionTop
                                  animated:YES];
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    // Set the title.
    self.title = @"Locations";
    self.navigationItem.leftBarButtonItem = self.editButtonItem;
    
    addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd
                                                              target:self action:@selector(addEvent)];
    addButton.enabled = NO;
    self.navigationItem.rightBarButtonItem = addButton;
    
    [self.locationManager startUpdatingLocation];
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    
    self.eventsArray = nil;
    self.locationManager = nil;
    self.addButton = nil;
}

- (void)dealloc
{
    [managedObjectContext release];
    [eventsArray release];
    [locationManager release];
    [addButton release];
    [super dealloc];
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}

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

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSDateFormatter *dateFormatter = nil;
    if (dateFormatter == nil) {
        dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setTimeStyle:NSDateFormatterMediumStyle];
        [dateFormatter setDateStyle:NSDateFormatterMediumStyle];
    }
    
    static NSNumberFormatter *numberFormatter = nil;
    if (numberFormatter == nil) {
        numberFormatter = [[NSNumberFormatter alloc] init];
        [numberFormatter setNumberStyle:NSNumberFormatterDecimalStyle];
        [numberFormatter setMaximumFractionDigits:3];
    }
        
    static NSString *CellIdentifier = @"Cell";
    
    // Dequeue or create a new cell.
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
    }
    
    Event *event = (Event *)[eventsArray objectAtIndex:indexPath.row];
    
    cell.textLabel.text = [dateFormatter stringFromDate:event.creationDate];
    cell.detailTextLabel.text = [NSString stringWithFormat:@"%@, %@",
                                 [numberFormatter stringFromNumber:event.latitude],
                                 [numberFormatter stringFromNumber:event.longitiude]];
    
    return cell;
}

/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the specified item to be editable.
    return YES;
}
*/

/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // Delete the row from the data source
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
    }   
    else if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
    }   
}
*/

/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/

/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the item to be re-orderable.
    return YES;
}
*/

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Navigation logic may go here. Create and push another view controller.
    /*
     <#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil];
     // ...
     // Pass the selected object to the new view controller.
     [self.navigationController pushViewController:detailViewController animated:YES];
     [detailViewController release];
     */
}

@end

RootViewController.h

//
//  RootViewController.h
//  Locations
//
//  Created by Rhys Powell on 8/09/11.
//  Copyright (c) 2011 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>

@interface RootViewController : UITableViewController <CLLocationManagerDelegate> {
    
    NSMutableArray *eventsArray;
    NSManagedObjectContext *managedObjectContext;
    
    CLLocationManager *locationManager;
    UIBarButtonItem *addButton;
}

@property (nonatomic, retain) NSMutableArray *eventsArray;
@property (nonatomic, retain) NSManagedObjectContext *managedObjectContext;

@property (nonatomic, retain) CLLocationManager *locationManager;
@property (nonatomic, retain) UIBarButtonItem *addButton;

- (void)addEvent;

@end