iOS：作为响应，当数据来自web服务时，如何获取多个经度和纬度的位置名称？

我需要帮助我的代码。我从一个web服务得到了经度和纬度作为响应。我需要将它们转换为位置名称，并在相应的表视图单元格标签中显示。
以下是我视图的响应、代码和屏幕截图，其中显示了转换后的城市、国家名称，并更正了错误代码

#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.
}

#导入
#导入“JobTableViewCell.h”
#导入“SlideNavigationController.h”
#进口
@接口JobPostedViewController:UIViewController
@属性（强，非原子）NSArray*job_id；
@属性（强，非原子）NSArray*分配的用户id；
@财产（强、非原子）NSArray*职务；
@属性（强、非原子）NSArray*工作描述；
@属性（强、非原子）NSArray*作业优先级；
@属性（强，非原子）NSString*作业经度；
@属性（强，非原子）NSArray*日期；
@属性（强，非原子）NSString*job_纬度；
@属性（强、非原子）NSArray*作业完成；
@属性（强，非原子）NSArray*作业开始日期；
@不动产（强、非原子）NSArray*投标；
@属性（非原子，强）CLGeocoder*myGeocoder；
-（iAction）onClickJobButton：（id）发送方；
@属性（弱，非原子）IBUIButton*侧导航；
@属性（弱、非原子）IBUITableView*jobPostedTableView；
@结束
`
-（无效）viewDidLoad{
[超级视图下载]；
//加载视图后执行任何其他设置。
self.jobPostedTableView.dataSource=self；
//幻灯片导航
[self.sideNavigation addTarget:[SlideNavigationController sharedInstance]操作：@selector（toggleLeftMenu）for ControlEvents:UIControlEventTouchUpInside]；
WebManager*manager=[WebManager sharedInstance]；
[manager getJobPostedWithCompletionBlock:^（id响应）{
NSDictionary*dictionary=（NSDictionary*）响应；
//从JSON读取数据
NSDictionary*responseObject=[dictionary objectForKey:@“response”]；
NSLog（@“数组%@”，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_longide=[responseObject objectForKey:@“job_longide”]；
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重载数据]；
}];
CLGeocoder*ceo=[[CLGeocoder alloc]init]；
CLLocation*loc=[[CLLocation alloc]initWithLatitude:[self.job\u lations floatValue]经度：[self.job\u lations floatValue]]；//插入坐标
[首席执行官撤销任命：loc
completionHandler:^（NSArray*放置标记，NSError*错误）{
CLPlacemark*placemark=[placemarks objectAtIndex:0]；
NSLog（@“placemark%@”，placemark）；
//保存地址的字符串
[[placemark.addressDictionary值forkey:@“FormattedAddressLines”]组件通过字符串连接：@“，”；
NSLog（@“addressDictionary%@”，placemark.addressDictionary）；
NSArray*ar=[placemark.addressDictionary objectForKey:@“locality”]；
NSLog（@“placemark%@”，ar）；//提取城市名称
NSLog（@“placemark%@”，placemark.country）；//给出国家名称
}
];
}
#pragma标记-SlideNavigationController方法
-（BOOL）滑动激活控制器应显示左侧菜单
{
返回YES；
}
#pragma标记-TableView数据源
-（NSInteger）表视图：（UITableView*）表视图行数节：（NSInteger）节
{
返回[self.job_title count]；
}
-（NSInteger）表格视图中的节数：（UITableView*）表格视图
{
返回1；
}
-（UITableViewCell*）tableView:（UITableView*）tableView cellForRowAtIndexPath:（NSIndexPath*）indexPath
{
静态NSString*cellIdentifier=@“JobTableViewCell”；
JobTableViewCell*单元格=（JobTableViewCell*）[self.jobPostedTableView出列重用CellWithIdentifier:cellIdentifier]；
如果（单元格==nil）{
cell=[[JobTableViewCell alloc]initWithStyle:UITableViewCellStyleDefault重用标识符：cellIdentifier]；
}
//比较数组字符串以显示紧急图像
if（[[self.job\u priority objectAtIndex:indexPath.row]
isEqualToString:@“紧急”]）{
cell.urgentlab.hidden=否；
}否则{
cell.urgentlab.hidden=是；
}
//条件作业完成是打开还是关闭
if（[[self.job_completed objectAtIndex:indexPath.row]
isEqualToString:@“1”]）{
cell.jobStatus.text=@“打开”；
[cell.jobStatus setTextColor:[UIColor color with red:（84/255.f）green:（56/255.f）blue:（255/255.f）alpha:1.0f]；
cell.flagImage.image=[UIImage ImageName:@“jobPosted_opened.PNG”]；
}否则{
cell.jobStatus.text=@“已关闭”；
[cell.jobStatus setTextColor:[UIColor color with red:（179/255.f）green:（179/255.f）blue:（180/255.f）alpha:1.0f]；
cell.flagImage.image=[UIImage ImageName:@“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:indexath.row]stringValue]；
返回单元；
}
-（无效）未收到记忆警告{
[超级记忆警告]；
//处置所有可以重新创建的资源。
}

以下是解决方案：

将

NSString

更改为

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

@property (strong, nonatomic) NSMutableDictionary* reversedGeocodes;

self.reversedGeocodes = [NSMutableDictionary dictionary];

- (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);
    }
}

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;