Saving Variable value outside of Connection didReceiveData Ùdelagate Method

Question

I have tried to find a similar question but I was unable to do so. I have a singleton that is used to gather information through out my app. Once of the values is obtained within the following method.

-(NSString *)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data-(NSString *)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

In this method I get the response from th webservice that I am trying to connect to. Everything is good. However any attempt to save the variable value to my singleton fails. Within this method no problem. When I try to get to the next view and reference my singleton, it is as if the value never gets saved.

Here is a skeleton of my code.

NBXJSONResponse *jsonResponse = [NBXJSONResponse sharedHostedResponseSingleton];
[jsonResponse setHostedURL:_hostedURL];

Basically the goal here is to have the hosted payment page appear in the next view. The flow flow for that works. I just need to pass the URI link so that payment can be made.

I know that I can return a value from this delegate method, but since I never explicitly call this method, so I am unsure where it is being called. Probably the reason why my values are not being saved in the singleton class.

EDIT:

Right now I have one view which does all of the action.

//
//  NBXViewController.h file

#import <UIKit/UIKit.h>

@interface NBXViewController : UIViewController

//*************************************************
// Variables to be declared for NBXViewController *
//*************************************************

@property (strong, nonatomic) IBOutlet UILabel *storeLabel;
@property (strong, nonatomic) IBOutlet UIButton *purchaseButton;
@property (strong, nonatomic) IBOutlet NSString *hostedURL;


//*************************************************
// Button Action methods for the buttons on View  *
//*************************************************

- (IBAction)puchaseButtonAction:(id)sender;

//*************************************************
// Connection Delegate Methods                    *
//*************************************************

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error; // Handle Connection Error
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data; // Data Received from Connection (Header Information)
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response; //Response from Connection (Return from Hosted being called)
-(void)connectionDidFinishLoading:(NSURLConnection *)connection; // Coonection did finish loading


@end

Implementation file.

//
//  NBXViewController.m
//  HostedAPI
//
//  Created by Philip Teoli on 3/1/2014.
//  Copyright (c) 2014 Philip Teoli. All rights reserved.
//

#import "NBXViewController.h"
#import "NBXJSONResponse.h"


@interface NBXViewController ()

@end

@implementation NBXViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

}

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

//****************************************
// PurchaseButton Action Method          *
//****************************************

- (IBAction)puchaseButtonAction:(id)sender
{
    //************************************
    // Building JSON Request             *
    //************************************

    NSString *jsonString = @"Sample Request";

    //**************************************
    // Convert JSON String to NSData       *
    //**************************************

    NSData* jsonRequestData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];

    //**************************************
    // Creating JSON object to Send        *
    //**************************************

    NSString *jsonRequest = [[NSString alloc] initWithData:jsonRequestData encoding:NSUTF8StringEncoding];


    //*****************************************
    // Base64 Encoding for Application Header *
    //*****************************************

    NSString *base64Signature = @"NbMIIkomZ8mFNw97EGRT:NAA5e965731e8a27ab11f5f";
    NSString *basic = @"Basic: ";
    NSData *base64SignatureData = [base64Signature dataUsingEncoding: NSUTF8StringEncoding];
    NSString *base64SignatureEncoded = [base64SignatureData base64EncodedStringWithOptions:0];
    NSString *header = nil;
    header = [basic stringByAppendingString:base64SignatureEncoded];

   // NSLog(@"Encoded Header: %@", header);

    //*************************************
    // Preparing to send XML through POST *
    //*************************************

    NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[jsonRequest length]]; //Calculating the Content Length
    NSData *postData = [jsonRequest dataUsingEncoding:NSUTF8StringEncoding]; // preapring JSON Request to be sent


    //**************************************
    // Headers and POST Body               *
    //**************************************

    NSURL *serviceUrl = [NSURL URLWithString:@"https://pay.test.ewbservice.com/orders"];
    NSMutableURLRequest *serviceRequest=[NSMutableURLRequest requestWithURL:serviceUrl cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:60];
    [serviceRequest setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [serviceRequest setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [serviceRequest setValue:header forHTTPHeaderField:@"Authorization"];
    [serviceRequest setHTTPMethod:@"POST"];
    [serviceRequest setHTTPBody:postData];

    NSURLConnection *connection = [[NSURLConnection alloc]
                                   initWithRequest:serviceRequest
                                   delegate:self startImmediately:YES];

    [connection scheduleInRunLoop:[NSRunLoop mainRunLoop]
                          forMode:NSDefaultRunLoopMode];
    [connection start];

    NSLog(@"Hosted URL in Button: %@", _hostedURL);



}

//****************************************************
// Implementation of Connection Delegate Methods     *
//****************************************************


-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    NSLog(@"did fail");
}

//*******************************************************
// Connection Data Received                             *
//*******************************************************

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    NSString *dataResponse = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSError *error = nil;
    NSDictionary *jsonDictionary = [NSJSONSerialization JSONObjectWithData: [dataResponse dataUsingEncoding:NSUTF8StringEncoding]
                                    options: NSJSONReadingMutableContainers
                                      error: &error];

    //********************************
    // Iterating through Dictionary  *
    //********************************

    NSArray *jsonLink = nil;

    for(id key in jsonDictionary)
    {
        if ([key isEqualToString:@"link"])
        {
            jsonLink = [jsonDictionary objectForKey:key]; // this returns a dictionary. Will need to parse dictionary another 2 times to get proper URI.
        }

    }

    NSDictionary *test = [jsonLink objectAtIndex:0];


    for(id key in test)
    {
        if ([key isEqualToString:@"uri"])
        {
            _hostedURL = [test objectForKey:key];
        }

    }

    NBXJSONResponse *jsonResponse = [NBXJSONResponse sharedHostedResponseSingleton];
    [jsonResponse setHostedURL:_hostedURL];
}

//*******************************************************
// Connection Response Method                           *
//*******************************************************

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    NSLog(@"did receive response: \n %@", response);
    NBXJSONResponse *jsonResponse = [NBXJSONResponse sharedHostedResponseSingleton];
    [jsonResponse setHostedURL:_hostedURL];

}

//*******************************************************
// Connection Finished Loading Data Method              *
//*******************************************************

-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSLog(@"did finish loading!!! \n%@", _hostedURL);
  //  NBXJSONResponse *jsonResponse = [NBXJSONResponse sharedHostedResponseSingleton];
  //  [jsonResponse setHostedURL:_hostedURL];
}


@end

Please let me know of your thoughts. I can post more details if needed. Thanks in advance for your help!!!

Regards,

Answer 1

Thanks to the great help from @rdelmar I was able to get through this. Basically in short what was happening was that I was going to the next view before the information was received by my previous view from the web service. So when I was trying to change a label with a value to my Singleton, it was not stored yet. How I got around the issue is that when I click a button I wait until the web services responses and then I add a view to go to the new view. Now my URL that I was waiting reaches me, I save it to Singleton and then I go to the next view.

I will add my code once I can grab it and post it.

Thanks again for all of your help Eric!!! Your patience and help make you a great person on this community.

Regards, Corporate One