Parsing JSON to place annotations on Map - ios

Question

I am trying to parse a JSON from Google to place annotations on Map. Parsing JSON using AFNetworking and parsing process is in Singleton class. I am getting values from two different JSON.
Places Autocomplete JSON of Google
Places Details JSON of Google
Here is my code for Singleton class
-(void)getData:(NSString *)searchString
{
_dataArray = [[NSMutableArray alloc]init];
NSString *requestString = [[NSString alloc]init];
requestString = [NSString stringWithFormat:#"https://maps.googleapis.com/maps/api/place/autocomplete/json?input=%#&sensor=true&key=APIKEY",searchString];
requestString = [requestString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *URL = [NSURL URLWithString:requestString];
NSURLRequest *requestURL = [NSURLRequest requestWithURL:URL];
AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:requestURL success:^(NSURLRequest *requestURL,NSHTTPURLResponse *response, id JSON){
self.dataArray = [JSON objectForKey:#"predictions"];
[[NSNotificationCenter defaultCenter]postNotificationName:#"Doreload" object:nil];
}failure:^(NSURLRequest *requestURL,NSHTTPURLResponse *response,NSError *error, id JSON){
NSLog(#"Request Failed with Error: %#, %#", error, error.userInfo);
}];
[operation start];
}
-(void)detailList:(NSString *)referenceString
{
_detailArray = [[NSMutableArray alloc]init];
NSString *requestString = [[NSString alloc]initWithFormat:#"https://maps.googleapis.com/maps/api/place/details/json?reference=%#&sensor=true&key=APIKEY",referenceString];
NSURL *URL = [NSURL URLWithString:requestString];
NSURLRequest *requestURL = [NSURLRequest requestWithURL:URL];
AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:requestURL success:^(NSURLRequest *requestURL,NSHTTPURLResponse *response, id JSON){
self.detailArray = [JSON objectForKey:#"result"];
[[NSNotificationCenter defaultCenter]postNotificationName:#"showList" object:nil];
}failure:^(NSURLRequest *requestURL,NSHTTPURLResponse *response,NSError *error, id JSON){
}];
[operation start];
}
In ViewController with the first function I am passing the name of the Place in the tableView :
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
sharedRequest = [RequestHandler sharedRquest];
static NSString *cellID = #"Cell Identifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];
if (cell == nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID];
}
cell.textLabel.text = [[sharedRequest.dataArray objectAtIndex:indexPath.row]objectForKey:#"description"];
[_spinner stopAnimating];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
DetailViewController *details = [[DetailViewController alloc]initWithNibName:#"DetailViewController" bundle:nil];
details.stringReference = [[sharedRequest.dataArray objectAtIndex:indexPath.row]objectForKey:#"reference"];
[self.navigationController pushViewController:details animated:YES];
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
And the Details Class is :
- (void)viewDidLoad
{
[super viewDidLoad];
[[RequestHandler sharedRquest]detailList:self.stringReference];
[[NSNotificationCenter defaultCenter]addObserver:self selector:#selector(showOnMap) name:#"showList" object:nil];
self.spinner = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
self.spinner.hidesWhenStopped = YES;
self.spinner.frame = CGRectMake(0, 0, 320, 480);
[self.view addSubview:_spinner];
[_spinner startAnimating];
self.mapView.showsUserLocation = TRUE;
self.mapView.delegate = self;
}
- (void)showOnMap:(NSNotification *)notification
{
NSLog(#"Entered");
sharedRequest = [RequestHandler sharedRquest];
NSString *string = [[NSString alloc]init];
string = [sharedRequest.detailArray valueForKey:#"name"];
self.label.text = string;
}
-(void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
sharedRequest = [RequestHandler sharedRquest];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(userLocation.coordinate, 30000, 30000);
[self.mapView setRegion:[self.mapView regionThatFits:region] animated:YES];
double latitude = [[[[sharedRequest.detailArray valueForKey:#"geometry"]objectForKey:#"location"]objectForKey:#"lat"]doubleValue];
double longitude =[[[[sharedRequest.detailArray valueForKey:#"geometry"]objectForKey:#"location"]objectForKey:#"lng"]doubleValue];
CLLocationCoordinate2D coord = { latitude, longitude };
MKPointAnnotation *point = [[MKPointAnnotation alloc]init];
point.coordinate = coord;
point.title = [sharedRequest.detailArray valueForKey:#"name"];
[self.mapView addAnnotation:point];
[_spinner stopAnimating];
}
The problem is in Details Class for the first time when using with break points it shows annotations and second it throughs an error:
-[__NSArrayI objectForKey:]: unrecognized selector sent to instance 0x86332e0
EDIT:
here is what shared.detailArray has:
"address_components" = (
{
"long_name" = Francestown;
"short_name" = Francestown;
types = (
locality,
political
);
},
{
"long_name" = Hillsborough;
"short_name" = Hillsborough;
types = (
"administrative_area_level_2",
political
);
},
{
"long_name" = "New Hampshire";
"short_name" = NH;
types = (
"administrative_area_level_1",
political
);
},
{
"long_name" = "United States";
"short_name" = US;
types = (
country,
political
);
}
);
"adr_address" = "<span class=\"locality\">Francestown</span>, <span class=\"region\">NH</span>, <span class=\"country-name\">USA</span>";
"formatted_address" = "Francestown, NH, USA";
geometry = {
location = {
lat = "42.9875";
lng = "-71.8130599";
};
viewport = {
northeast = {
lat = "43.03844";
lng = "-71.7474139";
};
southwest = {
lat = "42.949703";
lng = "-71.88583609999999";
};
};
};
icon = "http://maps.gstatic.com/mapfiles/place_api/icons/geocode-71.png";
id = ccd239475516163d29405af62fb286bedb4c6377;
name = Francestown;
reference = "CoQBcwAAAPSQxzNrepzPywLZr1PDoPEmQmGR8rIPTPoQ_f2kXpceRGHU_J_FEcrDxZSzebqLRpNYlUC_-xRJVV7Jx_mW1KJ33foU9y0ZCNK_kC1orqZVK5B-EONPD_Ef_e9WXXZdfOZTBQzNYLhoVdP8Ufa1bPe_vuuwe3rqYtf80IyANb8mEhCKi6kISip4ItpBFfgWjuGvGhSj0hURZaTQXX4lnFlxe2v4O5Uo6Q";
types = (
locality,
political
);
url = "https://maps.google.com/maps/place?q=Francestown&ftid=0x89e22c36ba6dc937:0x52cccc5f0f9b8663";
vicinity = Francestown;
}
I tried a lot to understand the error, but all in vain.
Any help would be appreciable.
Thanks

Answer 1

Hope this will help you if you are looking to achieve results using a different way.
I used NSJSONSerialization class to parse the json response from Google.
In this method I parse the NSMutable Data object- _routeData(created by appending data from Google response)
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSMutableArray *polyLinesArray = [[NSMutableArray alloc] init];
NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:_routeData options:kNilOptions error:nil];
NSArray *locationArray = [[[[[jsonDict valueForKey:#"routes"]valueForKey:#"legs"]valueForKey:#"steps"]valueForKey:#"polyline"] valueForKey:#"points"];
if(locationArray.count > 0)
{
NSArray *polyLinePointsArray = [[locationArray objectAtIndex:0]objectAtIndex:0];
for (int i = 0; i < [polyLinePointsArray count]; i++)
{
NSString *encodedPoints = [polyLinePointsArray objectAtIndex:i];
MKPolyline *route = [self polylineWithEncodedString:encodedPoints];
[polyLinesArray addObject:route];
}
// remove previous overlays
if(_mapView.overlays.count > 0)
{
[_mapView removeOverlays:_mapView.overlays];
}
[self.mapView addOverlays:polyLinesArray];
}
}
To decode the polyline points response from Google I used a class I found on stackoverflow..
- (MKPolyline *)polylineWithEncodedString:(NSString *)encodedString
{
const char *bytes = [encodedString UTF8String];
NSUInteger length = [encodedString lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
NSUInteger idx = 0;
NSUInteger count = length / 4;
CLLocationCoordinate2D *coords = calloc(count, sizeof(CLLocationCoordinate2D));
NSUInteger coordIdx = 0;
float latitude = 0;
float longitude = 0;
while (idx < length) {
char byte = 0;
int res = 0;
char shift = 0;
do {
byte = bytes[idx++] - 63;
res |= (byte & 0x1F) << shift;
shift += 5;
} while (byte >= 0x20);
float deltaLat = ((res & 1) ? ~(res >> 1) : (res >> 1));
latitude += deltaLat;
shift = 0;
res = 0;
do {
byte = bytes[idx++] - 0x3F;
res |= (byte & 0x1F) << shift;
shift += 5;
} while (byte >= 0x20);
float deltaLon = ((res & 1) ? ~(res >> 1) : (res >> 1));
longitude += deltaLon;
float finalLat = latitude * 1E-5;
float finalLon = longitude * 1E-5;
CLLocationCoordinate2D coord = CLLocationCoordinate2DMake(finalLat, finalLon);
coords[coordIdx++] = coord;
if (coordIdx == count) {
NSUInteger newCount = count + 10;
coords = realloc(coords, newCount * sizeof(CLLocationCoordinate2D));
count = newCount;
}
}
MKPolyline *polyline = [MKPolyline polylineWithCoordinates:coords count:coordIdx];
free(coords);
return polyline;
}

Answer 2

Instead of this
double latitude = [[[[sharedRequest.detailArray valueForKey:#"geometry"]objectForKey:#"location"]objectForKey:#"lat"]doubleValue];
double longitude =[[[[sharedRequest.detailArray valueForKey:#"geometry"]objectForKey:#"location"]objectForKey:#"lng"]doubleValue];
try this,
double latitude = [[[[sharedRequest.detailArray valueForKey:#"geometry"]valueForKey:#"location"]valueForKey:#"lat"]doubleValue];
double longitude =[[[[sharedRequest.detailArray valueForKey:#"geometry"]valueForKey:#"location"]valueForKey:#"lng"]doubleValue];

Answer 3

Found the Solution:
- (void)showOnMap:(NSNotification *)notification
{
NSLog(#"Entered");
sharedRequest = [RequestHandler sharedRquest];
NSString *string = [[NSString alloc]init];
string = [sharedRequest.detailArray valueForKey:#"name"];
self.label.text = string;
double latitude = [[[[sharedRequest.detailArray valueForKey:#"geometry"]objectForKey:#"location"]objectForKey:#"lat"]doubleValue];
double longitude =[[[[sharedRequest.detailArray valueForKey:#"geometry"]objectForKey:#"location"]objectForKey:#"lng"]doubleValue];
CLLocationCoordinate2D coord = { latitude, longitude };
MKPointAnnotation *point = [[MKPointAnnotation alloc]init];
point.coordinate = coord;
point.title = [sharedRequest.detailArray valueForKey:#"name"];
[self.mapView addAnnotation:point];
[_spinner stopAnimating];
}
-(void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
sharedRequest = [RequestHandler sharedRquest];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(userLocation.coordinate, 30000, 30000);
[self.mapView setRegion:[self.mapView regionThatFits:region] animated:YES];
}