how to make login page in iphone using HTTP Post method


- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
 
   // appDelegate=(AppDelegate*)[[UIApplication sharedApplication]delegate];
 //   defaults=[NSUserDefaults standardUserDefaults];

    usename_text.delegate=self;
    password_text.delegate=self;
 
    usename_text.layer.cornerRadius=3.0f;
    usename_text.layer.masksToBounds=YES;
    usename_text.layer.borderColor=[[UIColor whiteColor]CGColor];
    usename_text.layer.borderWidth= 1.0f;
 
    NSAttributedString *place_user = [[NSAttributedString alloc] initWithString:@"Email*" attributes:@{ NSForegroundColorAttributeName : [UIColor whiteColor] }];
    usename_text.attributedPlaceholder = place_user;
 
    password_text.layer.cornerRadius=3.0f;
    password_text.layer.masksToBounds=YES;
    password_text.layer.borderColor=[[UIColor whiteColor]CGColor];
    password_text.layer.borderWidth= 1.0f;
 
    NSAttributedString *place_pwd = [[NSAttributedString alloc] initWithString:@"Password*" attributes:@{ NSForegroundColorAttributeName : [UIColor whiteColor] }];
    password_text.attributedPlaceholder = place_pwd;
 

}
-(IBAction)Login:(id)sender
{
    BOOL email_validate = [self validateEmail:usename_text.text];
 
    BOOL pwd_validate =[self validatename:password_text.text];
 
    if (email_validate && pwd_validate)
    {
        user_name_str= usename_text.text;
     
        pwd_str= password_text.text;
     
        [self reachability_check];
    }
    else
    {
        if (!email_validate && !pwd_validate ) {
         
            usename_text.layer.cornerRadius=3.0f;
            usename_text.layer.masksToBounds=YES;
            usename_text.layer.borderColor=[[UIColor redColor]CGColor];
            usename_text.layer.borderWidth= 1.0f;
         
            password_text.layer.cornerRadius=3.0f;
            password_text.layer.masksToBounds=YES;
            password_text.layer.borderColor=[[UIColor redColor]CGColor];
            password_text.layer.borderWidth= 1.0f;
       
        }
     
    }
}
#pragma mark - Validation - Email / Gender
-(BOOL)validateEmail:(NSString*)email
{
    user_name_str = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", user_name_str];
    return [emailTest evaluateWithObject:email];
}

-(BOOL)validatename:(NSString*)name
{
    if (name.length == 0)
    {
        return NO;
    }
    else
    {
        return YES;
    }
}

-(void)textFieldDidBeginEditing:(UITextField *)textField
{
    usename_text.layer.cornerRadius=3.0f;
    usename_text.layer.masksToBounds=YES;
    usename_text.layer.borderColor=[[UIColor whiteColor]CGColor];
    usename_text.layer.borderWidth= 1.0f;
 
    password_text.layer.cornerRadius=3.0f;
    password_text.layer.masksToBounds=YES;
    password_text.layer.borderColor=[[UIColor whiteColor]CGColor];
    password_text.layer.borderWidth= 1.0f;
 

}

frm_user_semail and frm_user_spwd are the key type to check and post.

-(void)post_data_to_server
{
    NSURL *url=[NSURL URLWithString:@“your url”];
    NSString *post =[[NSString alloc] initWithFormat:@"frm_user_semail=%@&frm_user_spwd=%@",usename_text.text,password_text.text];
    NSLog(@"Post is: %@",post);
    NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    NSLog(@"postData is: %@",postData);
    NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[postData length]];
    NSLog(@"postLength is: %@",postLength);
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:url];
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody:postData];

//[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
//[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Current-Type"];
    
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue]completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
     
        if (connectionError==nil)
        {
            NSError* error;
         
            NSDictionary* json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

//json is the outut

            NSString *str_name=@"";
            NSString *str_id=@"";
            NSString *str_usertoken=@"";
            NSString *str_company=@"";
            NSString *str_country=@"";
            NSString *str_phone=@"";
            NSString *str_errmsg=@"";
         
            NSString *str_errcode=@"";
            str_errcode = [json objectForKey:@"err_mode"];
     
         
            if ([[json objectForKey:@"success"]boolValue]==YES)
            {
             
                NSMutableDictionary *u_detailsDictionary = [json objectForKey:@"u_details"];
                [defaults setObject:u_detailsDictionary forKey:@"User_Details"];
                [defaults synchronize];
     
                str_name = [u_detailsDictionary objectForKey:@"name"];
                str_id = [u_detailsDictionary objectForKey:@"ID"];
                str_usertoken =[u_detailsDictionary objectForKey:@"user_token"];
                str_company =[u_detailsDictionary objectForKey:@"company"];
                str_country =[u_detailsDictionary objectForKey:@"country"];
                str_phone =[u_detailsDictionary objectForKey:@"phone"];

                [self gotoHomeController];
             
        }
        else if([json objectForKey:@"err_msg"])
            {
                str_errmsg = [json objectForKey:@"err_msg"];
                UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Attention!" message:str_errmsg delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
                    [alert show];
            }
        }
        else
        {
            UIAlertView *alertView=[[UIAlertView alloc]initWithTitle:@"Alert!!!" message:[[connectionError userInfo]objectForKey:@"NSLocalizedDescription"] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            [alertView show];
        }
     
    }];

}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
    if(textField==usename_text)
    {
        [usename_text resignFirstResponder];
    }
    else if(textField==password_text)
    {
        [password_text resignFirstResponder];
    }
    return YES;
}

 
- (void)viewWillDisappear:(BOOL)animated {
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}

#pragma mark - keyboard movements
- (void)keyboardWillShow:(NSNotification *)notification
{
    CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
 
    [UIView animateWithDuration:0.3 animations:^{
        CGRect f = self.view.frame;
        f.origin.y = -0.5f * keyboardSize.height;
        self.view.frame = f;
    }];
}

-(void)keyboardWillHide:(NSNotification *)notification
{
    [UIView animateWithDuration:0.3 animations:^{
        CGRect f = self.view.frame;
        f.origin.y = 0.0f;
        self.view.frame = f;
    }];
}
-(void)gotoHomeController
{
    ViewController *landing_vc = [[ViewController alloc]init];
    [self.navigationController pushViewController:landing_vc animated:YES];
}


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