NSURLConnection Web service call in Objective c

//  ViewController.m

//  NSURLConnection

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

-(void)viewDidLoad

{

    [super viewDidLoad];

    

    NSString *parameter = [NSString stringWithFormat:@"DeviceUDID=%@",[[[UIDevice currentDevice] identifierForVendor] UUIDString]];

    commonClass *conn=[[commonClass alloc]init];

    conn.delegate=self;

    conn.postDataIDREturn = [parameter dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

    [conn connectionWithURL:@"https://YOUR URL/"];

}

-(void)connectionSucceed:(NSData *)data

{

    //calling the Loading Action method

    NSError *error = nil;

    NSDictionary *dictionarys = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error];

    

}

-(void)connectionFailed:(NSError *)error

{

    NSLog(@"Error: %@",error);

}

@end

Custom Class:

//  commonClass.h

#import <Foundation/Foundation.h>

#import <UIkit/UIKit.h>

@protocol connectionDelegate <NSObject>

-(void)connectionSucceed:(NSData *)data;

-(void)connectionFailed:(NSError *)error;

@end

@interface commonClass : NSObject

{

    id<connectionDelegate> delegate;

    NSMutableData  *receivedData;

}

@property(nonatomic, retain) id<connectionDelegate> delegate;

@property(nonatomic, retain) NSMutableData *receivedData;

@property(nonatomic,retain) NSData *postDataIDREturn;

- (void)connectionWithURL:(NSString *)URL;

@end

//  commonClass.m

#import "commonClass.h"

@implementation commonClass

@synthesize delegate, receivedData,postDataIDREturn;

- (void)connectionWithURL:(NSString *)URL

{

    NSURL *url = [NSURL URLWithString:URL];

    NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];

    [theRequest addValue:@"application/x-www-form-urlencoded; charset=utf-8"     forHTTPHeaderField:@"Content-Type"];

    [theRequest setHTTPMethod:@"POST"];

    [theRequest setHTTPBody:postDataIDREturn];

    theRequest.timeoutInterval = 150;

    

    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];

    

    if( connection )

    {

        self.receivedData = [[NSMutableData alloc] init];

    }else

    {

        NSLog(@"Connection Failed!");

    }}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response

{

    [self.receivedData setLength:0];

}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{

    [self.receivedData appendData:data];

}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection

{

    [self.delegate connectionSucceed:self.receivedData];

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error

{

    [self.delegate connectionFailed:error];

}

@end