Cómo enviar CORREO y OBTENER solicitud?

Usando RestKit puede hacer una simple solicitud POST (vea esta página GitHub para más detalles).

Importa RestKit en tu archivo de cabecera.

#import <RestKit/RestKit.h>

Luego puede comenzar creando un nuevo RKRequest.

RKRequest *MyRequest = [[RKRequest alloc] initWithURL:[[NSURL alloc] initWithString:@"http://myurl.com/FakeUrl/"]];

Luego especifique qué tipo de solicitud desea realizar (en este caso, una solicitud POST).

MyRequest.method = RKRequestMethodPOST;
MyRequest.HTTPBodyString = YourPostString;

Y luego establece tu solicitud como JSON en additionalHTTPHeaders.

MyRequest.additionalHTTPHeaders = [[NSDictionary alloc] initWithObjectsAndKeys:@"application/json", @"Content-Type", @"application/json", @"Accept", nil];

Finalmente, puede enviar el solicitud.

[MyRequest send];

Además puede NSLog su solicitud para ver el resultado.

RKResponse *Response = [MyRequest sendSynchronously];
NSLog(@"%@", Response.bodyAsString);

Fuentes: RestKit.org y Me.

 -(void)postmethod
    {

        NSString * post =[NSString stringWithFormat:@"Email=%@&Password=%@",_txt_uname.text,_txt_pwd.text];

        NSData *postdata= [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
        NSString *postLength=[NSString stringWithFormat:@"%lu",(unsigned long)[postdata length]];
        NSMutableURLRequest *request= [[NSMutableURLRequest alloc]init];

        NSLog(@"%@",app.mainurl);

       // NSString *str=[NSString stringWithFormat:@"%@Auth/Login",app.mainurl];
        NSString *str=YOUR URL;
        [request setURL:[NSURL URLWithString:str]];
        [request setHTTPMethod:@"POST"];
        [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
        [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
        [request setHTTPBody:postdata];
        NSError *error;
        NSURLResponse *response;

        NSData *urlData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
        NSString *returnstring=[[NSString alloc]initWithData:urlData encoding:NSUTF8StringEncoding];
        NSMutableDictionary *dict=[returnstring JSONValue];

        NSLog(@"%@",dict);

        }

-(void)GETMethod
{
NSString *appurl;
    NSString *temp =@"YOUR URL";
    appurl = [NSString stringWithFormat:@"%@uid=%@&cid=%ld",temp,user_id,(long)clubeid];
    appurl = [appurl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:appurl]];
    NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse: nil error: nil ];
    NSString  *returnString = [[NSString alloc] initWithData:returnData encoding: NSUTF8StringEncoding];
    NSMutableDictionary *dict_eventalldata=[returnString JSONValue];
    NSString *success=[dict_eventalldata objectForKey:@"success"];
}

Solicitud Get:

-(void)fetchData{

 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        NSData* data = [NSData dataWithContentsOfURL:[NSURL
                                                      URLWithString:@"yourURL"]];
        NSLog(@"LatestURL:%@",data);
        NSError* error=nil;
        NSDictionary *jsonDict= [NSJSONSerialization JSONObjectWithData:data
                                                                options:kNilOptions error:&error];
        NSLog(@"JSON = %@", [[NSString alloc] initWithData:data encoding:
                             NSUTF8StringEncoding]);
        dispatch_async(dispatch_get_main_queue(), ^{


    NSDictionary *statuses=[jsonDict objectForKey:@"result"];
    NSLog(@"SomeStatus :%@",statuses);

    if (!statuses)
    {
        NSLog(@"Error in Json :%@",error);
    }
    else
    {
        [self.arrayTimeline removeAllObjects];
        for(NSDictionary *newValu in statuses)
        {
            [self.arrayTimeline addObject:newValu];
            NSString *ProjectName=[newValu objectForKey:@"project_name"];
            NSLog(@"Project Name : %@",ProjectName);
            NSString *Stage=[newValu objectForKey:@"stage_name"];
            NSLog(@"Stage : %@",Stage);
            NSString *CompTime=[newValu objectForKey:@"completion_time"];
            NSLog(@"Completion Time : %@",CompTime);
            NSString *Status=[newValu objectForKey:@"status"];
            NSLog(@"Status : %@",Status);
        }
        [self.projectTimelineTable reloadData];
    });
} }); }

Respuesta JSON: {"status":"success","name":"project1","address":"badkal mor metro station", "state": "haryana", "city": "faridabad", "start_time":"1480586013","current_stage":"Tender Acceptance","manager":"Not Available"," completion_time": "1480464000"}

Puede obtener el valor de las claves como name, start_time, etc. y mostrar en la etiqueta

Control de vista.h

@interface ViewController     UIViewController<UITableViewDataSource,UITableViewDelegate>

  @property (weak, nonatomic) IBOutlet UITableView *tableView;
  @property (strong,nonatomic)NSArray *array;
  @property NSInteger select;
  @end

Vista.m

  - (void)viewDidLoad {
 [super viewDidLoad];
 NSString *urlString = [NSString stringWithFormat:    @"https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=11.021459,76.916332&radius=2000&types=atm&sensor=false&key=AIzaS yD7c1IID7zDCdcfpC69fC7CUqLjz50mcls"];
 NSURL *url = [NSURL URLWithString: urlString];
 NSData *data = [NSData dataWithContentsOfURL:url];
 NSDictionary *jsonData = [NSJSONSerialization JSONObjectWithData:      
 data options: 0 error: nil];
 _array = [[NSMutableArray alloc]init];
 _array = [[jsonData objectForKey:@"results"] mutableCopy];
[_tableView reloadData];}
// Do any additional setup after loading the view, typically from a         



 - (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
  }
 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

return 1;
  }

  - (NSInteger)tableView:(UITableView *)tableView
  numberOfRowsInSection:(NSInteger)section {

 return _array.count;
  }

 - (UITableViewCell *)tableView:(UITableView *)tableView
     cellForRowAtIndexPath:(NSIndexPath *)indexPath {

 static NSString *cellid = @"cell";
 UITableViewCell *cell = [tableView
                         dequeueReusableCellWithIdentifier:cellid];
 cell = [[UITableViewCell
         alloc]initWithStyle:UITableViewCellStyleSubtitle
        reuseIdentifier:cellid];

 cell.textLabel.text = [[_array
 valueForKeyPath:@"name"]objectAtIndex:indexPath.row]; 
 cell.detailTextLabel.text = [[_array 
 valueForKeyPath:@"vicinity"]objectAtIndex:indexPath.row];
 NSURL *imgUrl = [NSURL URLWithString:[[_array
 valueForKey:@"icon"]objectAtIndex:indexPath.row]];  
 NSData *imgData = [NSData dataWithContentsOfURL:imgUrl];
 cell.imageView.layer.cornerRadius =        
 cell.imageView.frame.size.width/2;
 cell.imageView.layer.masksToBounds = YES;
 cell.imageView.image = [UIImage imageWithData:imgData];

 return cell;
 }

 @end

Tablecell.h

 @interface TableViewCell : UITableViewCell
 @property (weak, nonatomic) IBOutlet UIImageView *imgView;
 @property (weak, nonatomic) IBOutlet UILabel *lblName;
 @property (weak, nonatomic) IBOutlet UILabel *lblAddress;