iOS: How can i get location names of multiple longitudes and latitudes when data is coming from web service as a response?

Question

I need to help with my code. I am getting longitudes and latitudes as a response from a web service. I need to convert them to a location name and show it in respective table view cell label.
Following are the response, code and screen shot of my view where I show my converted city, country name, and correct my code where i am doing mistake.

#import <UIKit/UIKit.h>
#import "JobTableViewCell.h"
#import "SlideNavigationController.h"
#import <CoreLocation/CoreLocation.h>

@interface JobPostedViewController : UIViewController <SlideNavigationControllerDelegate, UITableViewDataSource, CLLocationManagerDelegate>

@property (strong, nonatomic) NSArray* job_id;
@property (strong, nonatomic) NSArray* assigned_user_id;
@property (strong, nonatomic) NSArray* job_title;
@property (strong, nonatomic) NSArray* job_description;
@property (strong, nonatomic) NSArray* job_priority;
@property (strong, nonatomic) NSString* job_longitude;
@property (strong, nonatomic) NSArray* date;
@property (strong, nonatomic) NSString* job_latitude;
@property (strong, nonatomic) NSArray* job_completed;
@property (strong, nonatomic) NSArray* job_start_date;
@property (strong, nonatomic) NSArray* bids;

@property (nonatomic, strong) CLGeocoder *myGeocoder;

- (IBAction)onClickJobButton:(id)sender;


@property (weak, nonatomic) IBOutlet UIButton *sideNavigation;
@property (weak, nonatomic) IBOutlet UITableView *jobPostedTableView;

@end
`

    - (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.jobPostedTableView.dataSource = self;

    //Slide Navigation
    [self.sideNavigation addTarget:[SlideNavigationController sharedInstance] action:@selector(toggleLeftMenu) forControlEvents:UIControlEventTouchUpInside];

    WebManager *manager = [WebManager sharedInstance];
    [manager getJobPostedWithCompletionBlock:^(id response){
        NSDictionary *dictionary = (NSDictionary *)response;

        // Read data from JSON
        NSDictionary *responseObject = [dictionary objectForKey:@"response"];
        NSLog(@"The Array%@",responseObject);

        self.bids = [responseObject objectForKey:@"bids"];
        self.job_description = [responseObject objectForKey:@"job_description"];
        self.job_id = [responseObject objectForKey:@"job_id"];
        self.job_completed = [responseObject objectForKey:@"job_completed"];
        self.job_latitude = [responseObject objectForKey:@"job_latitude"];
        self.job_longitude = [responseObject objectForKey:@"job_longitude"];
        self.job_priority = [responseObject objectForKey:@"job_priority"];
        self.job_start_date = [responseObject objectForKey:@"job_start_date"];
        self.job_title = [responseObject objectForKey:@"job_title"];

        [self.jobPostedTableView reloadData];
    }];

        CLGeocoder *ceo = [[CLGeocoder alloc]init];
        CLLocation *loc = [[CLLocation alloc]initWithLatitude:[self.job_latitude floatValue] longitude:[self.job_longitude floatValue]]; //insert your coordinates

        [ceo reverseGeocodeLocation:loc
                  completionHandler:^(NSArray *placemarks, NSError *error) {
                      CLPlacemark *placemark = [placemarks objectAtIndex:0];
                      NSLog(@"placemark %@",placemark);
                      //String to hold address
                      [[placemark.addressDictionary valueForKey:@"FormattedAddressLines"] componentsJoinedByString:@", "];
                      NSLog(@"addressDictionary %@", placemark.addressDictionary);
                      NSArray *ar = [placemark.addressDictionary objectForKey:@"locality"];
                      NSLog(@"placemark %@",ar); // Extract the city name
                      NSLog(@"placemark %@",placemark.country);  // Give Country Name

                  }

         ];
    }


#pragma mark - SlideNavigationController Methods

- (BOOL)slideNavigationControllerShouldDisplayLeftMenu
{

    return YES;
}

#pragma mark - TableView Data Source

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

- (NSInteger) numberOfSectionsInTableview:(UITableView *)tableView
{
    return 1;
}

- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *cellIdentifier = @"JobTableViewCell";
    JobTableViewCell *cell = (JobTableViewCell *)[self.jobPostedTableView dequeueReusableCellWithIdentifier:cellIdentifier];

    if(cell == nil) {

        cell = [[JobTableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
    }
    // Comparing array string to display an urgent image
    if ([[self.job_priority objectAtIndex:indexPath.row]
         isEqualToString:@"urgent"]) {
        cell.urgentLabel.hidden = NO;
    } else {
            cell.urgentLabel.hidden = YES;
    }
    // Condition whether job completed is open or closed
    if ([[self.job_completed objectAtIndex:indexPath.row]
         isEqualToString:@"1"]) {
        cell.jobStatus.text = @"Open";
        [cell.jobStatus setTextColor:[UIColor colorWithRed:(84/255.f) green:(56/255.f) blue:(255/255.f) alpha:1.0f]];
        cell.flagImage.image = [UIImage imageNamed:@"jobPosted_opened.PNG"];
    } else {
        cell.jobStatus.text = @"Closed";
        [cell.jobStatus setTextColor:[UIColor colorWithRed:(179/255.f) green:(179/255.f) blue:(180/255.f) alpha:1.0f]];
        cell.flagImage.image = [UIImage imageNamed:@"jobPosted_closed.PNG"];
    }


    cell.jobTitle.text = [self.job_title objectAtIndex:indexPath.row];
    cell.jobContent.text = [self.job_description objectAtIndex:indexPath.row];
    cell.bidsLabel.text = [[self.bids objectAtIndex:indexPath.row ]stringValue];
    return cell;

}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

Answer 1

Here's the solution:

1. Change NSString to NSArray of these properties:

   @property (strong, nonatomic) NSString* job_longitude;
   @property (strong, nonatomic) NSString* job_latitude;
   

---

2. Add a new property to hold the geocode results:

   @property (strong, nonatomic) NSMutableDictionary* reversedGeocodes;
   

---

3. Set reversedGeocodes in viewDidLoad: method:

   self.reversedGeocodes = [NSMutableDictionary dictionary];
   

---

4. Add this method to get the reversed geoCode (and save it for the future):

   - (void)locationNameWithLat:(float)lat
                           lng:(float)lng
             completionHandler:(void (^)(NSString *locationName, NSError *error))completion
   {
       if (!lat || !lng)
           completion(@"Unknown location", nil);
   
       if (!completion || !lat || !lng)
           return;
   
       NSString *latStr = @(lat).description;
       NSString *lngStr = @(lng).description;
   
       // For each pair of lat and lng creating a unique key and saving the result
       // so we don't have to process the same pair multiple times.
       // Example:
       // lat = 23.039567; lng = 72.566004;
       // key = @"23.03956772.566004"; value would be whatever CoreLocation returns
       NSString *key = [latStr stringByAppendingString:lngStr];
   
       if (key.length) {
           if ([self.reversedGeocodes[key] length]) {
               completion (self.reversedGeocodes[key], nil);
           } else {
               self.reversedGeocodes[key] = @"Loading...";
               CLGeocoder *geocoder = [[CLGeocoder alloc] init];
               CLLocation *location = [[CLLocation alloc] initWithLatitude:lat longitude:lng];
   
               [geocoder reverseGeocodeLocation:location
                              completionHandler:^(NSArray *placemarks, NSError *error) {
                                  if (error) {
                                      completion(@"Unknown location", error);
                                  } else {
                                      CLPlacemark *placemark = placemarks.firstObject;
                                      NSString *locationName = placemark.country; // Default = country
   
                                      if (placemark.locality.length) // add city if available
                                          locationName = [NSString stringWithFormat:@"%@, %@", placemark.locality, placemark.country];
   
                                      self.reversedGeocodes[key] = locationName.length ? locationName : @"Unknown location";
   
                                      completion(self.reversedGeocodes[key], nil);
                                  }
                              }
                ];
           }
       } else {
           completion(@"Unknown location", nil);
       }
   }
   

---

5. Call the above method from cellForRowAtIndexPat: method before your return the cell:

   float lat = self.job_latitude[indexPath.row];
   float lng = self.job_longitude[indexPath.row];
   
   [self locationNameWithLat:lat
                         lng:lng
           completionHandler:^(NSString *locationName, NSError *error) {
               cell.locationName.text = locationName;
           }];
   
   return cell;
   

---

P.S. Let me know if I missed anything or misspelled because I typed some of the code on here...