iOS-boilerplate/IOSBoilerplate/AutocompleteLocationExample.m

//
//  AutocompleteLocationExample.m
//  IOSBoilerplate
//
//  Copyright (c) 2011 Alberto Gimeno Brieba
//  
//  Permission is hereby granted, free of charge, to any person
//  obtaining a copy of this software and associated documentation
//  files (the "Software"), to deal in the Software without
//  restriction, including without limitation the rights to use,
//  copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the
//  Software is furnished to do so, subject to the following
//  conditions:
//  
//  The above copyright notice and this permission notice shall be
//  included in all copies or substantial portions of the Software.
//  
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
//  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
//  OTHER DEALINGS IN THE SOFTWARE.
//  

#import "AutocompleteLocationExample.h"
#import "StringHelper.h"
#import "JSONKit.h"
#import "AFJSONRequestOperation.h"
#import <MapKit/MapKit.h>

@implementation AutocompleteLocationExample

@synthesize suggestions;
@synthesize dirty;
@synthesize loading;
@synthesize label;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    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.
}

#pragma mark -
#pragma mark SearchBarDelegate

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
	if ([searchText length] > 2) {
		if (loading) {
			dirty = YES;
		} else {
			[self loadSearchSuggestions];
		}
	}
}

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
	return NO;
}


#pragma mark -
#pragma mark Search backend

- (void) loadSearchSuggestions {
	loading = YES;
	NSString* query = self.searchDisplayController.searchBar.text;
    // You could limit the search to a region (e.g. a country) by appending more text to the query
	// example: query = [NSString stringWithFormat:@"%@, Spain", text];
	NSString *urlEncode = [query urlEncode];
	NSString *urlString = [NSString stringWithFormat:@"http://maps.google.com/maps/geo?q=%@&hl=%@&oe=UTF8", urlEncode, [[NSLocale currentLocale] localeIdentifier]];
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]];
    
    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
        NSMutableArray* sug = [[NSMutableArray alloc] init];
        
        NSArray* placemarks = [JSON objectForKey:@"Placemark"];
        
        for (NSDictionary* placemark in placemarks) {
            NSString* address = [placemark objectForKey:@"address"];
            
            NSDictionary* point = [placemark objectForKey:@"Point"];
            NSArray* coordinates = [point objectForKey:@"coordinates"];
            NSNumber* lon = [coordinates objectAtIndex:0];
            NSNumber* lat = [coordinates objectAtIndex:1];
            
            MKPointAnnotation* place = [[MKPointAnnotation alloc] init];
            place.title = address;
            CLLocationCoordinate2D c = CLLocationCoordinate2DMake([lat doubleValue], [lon doubleValue]);
            place.coordinate = c;
            [sug addObject:place];
            [place release];
        }
        
        self.suggestions = sug;
        [sug release];
        
        [self.searchDisplayController.searchResultsTableView reloadData];
        loading = NO;
        
        if (dirty) {
            dirty = NO;
            [self loadSearchSuggestions];
        }
    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
        NSLog(@"failure %@", [error localizedDescription]);
        loading = NO;
    }];
    operation.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript", nil];
    [operation start];
}

#pragma mark -
#pragma mark UITableView methods

- (UITableViewCell *)tableView:(UITableView *)table cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
	static NSString *cellIdentifier = @"suggest";
	
	UITableViewCell *cell = [table dequeueReusableCellWithIdentifier:cellIdentifier];
	if (cell == nil) 
	{
		cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier] autorelease];
		cell.textLabel.lineBreakMode = UILineBreakModeWordWrap;
		cell.textLabel.numberOfLines = 0;
		cell.textLabel.font = [UIFont fontWithName:@"Helvetica" size:12.0];
	}
	
	MKPointAnnotation* suggestion = [suggestions objectAtIndex:indexPath.row];
	cell.textLabel.text = suggestion.title;
	return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
	[self.searchDisplayController setActive:NO animated:YES];
	
	MKPointAnnotation* suggestion = [suggestions objectAtIndex:indexPath.row];
    // You could add "suggestion" to a map since it implements MKAnnotation
    // example: [map addAnnotation:suggestion]

    label.text = suggestion.title;
}

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

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.title = @"Search a location";
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return YES;
}

- (void)dealloc {
    [suggestions release];
    [label release];
    [super dealloc];
}

@end