Custom delegate method doesn't get called - ios

Question

So, I'm following this answer in trying to pass data between two classes in an iOS project without storyboards. I'm trying to abstract all my server calls in a different class, so the ViewControllers don't get too cramped. I have an OfferRequest class, which handles the server requests and declares the protocol:
#protocol OfferRequestDelegate <NSObject>
-(void)addOfferRequest: (OfferRequest *)request dataFromRequest: (NSMutableArray *)data;
#end
#interface OfferRequest : NSObject <LocationManagerDelegate, NSURLConnectionDataDelegate>
#property (nonatomic, weak) id <OfferRequestDelegate> delegate;
#end
The idea is to call addOfferRequest: dataFromRequest in connectionDidFinishLoading, set the data as the result from the request and pass it on to the ViewController.
In OfferRequest.m:
-(void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSMutableArray *result = [NSJSONSerialization JSONObjectWithData:receivedData options:kNilOptions error:nil];
[self.delegate addOfferRequest:self dataFromRequest:result];
}
I declare my ViewController as a delegate for the OfferRequest:
#interface CategorySuggestionViewController : UIViewController <OfferRequestDelegate>
Initialize the OfferRequest object and set it's delegate:
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
offer = [OfferRequest new];
offer.delegate = self;
}
And then implement the delegate method:
-(void)addOfferRequest:(OfferRequest *)request dataFromRequest:(NSMutableArray *)data {
NSLog(#"received data = %#", data);
}
But it never gets called. What am I missing ?

Answer 1

try this...
your OfferRequest class like below i have given name it as connectionClass
connectionClass.h
#protocol connectionDelegate <NSObject>
-(void)connectionSucceed:(NSData *)data;
-(void)connectionFailed:(NSError *)error;
#end
#import <Foundation/Foundation.h>
#interface connectionClass : NSObject
{
id<connectionDelegate> delegate;
NSMutableData *receivedData;
NSString *encodedString;
NSMutableURLRequest *theRequest;
NSURL *url;
NSString *length;
NSURLConnection *Connect;
}
#property(nonatomic, retain) id<connectionDelegate> delegate;
#property(nonatomic, retain) NSMutableData *receivedData;
- (void)connectionWithURL:(NSString *)URL;
#end
connectionClass.m
#import "connectionClass.h"
#implementation connectionClass
#synthesize delegate, receivedData;
- (void)connectionWithURL:(NSString *)URL
{
url=[[NSURL alloc] initWithString:[self urlencode:URL]];
theRequest= [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:60];
[theRequest setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
length = [NSString stringWithFormat:#"%lu", (unsigned long)[URL length]];
[theRequest setValue:length forHTTPHeaderField:#"Content-Length"];
[theRequest setHTTPMethod:#"POST"];
[theRequest setHTTPBody:[URL dataUsingEncoding:NSUTF8StringEncoding]];
Connect = [NSURLConnection connectionWithRequest:theRequest delegate:self];
if (Connect)
{
self.receivedData = [NSMutableData data];
}
else
{
NSError *error;
[self.delegate connectionFailed:error];
}
}
- (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];
}
-(NSString *) urlencode: (NSString *) string
{
encodedString = (NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(NULL, (CFStringRef)string, NULL, (CFStringRef)#"", kCFStringEncodingUTF16));
return encodedString;
}
#end
don't forget to import your connectionclass and delegate
#interface yourclass : UIViewController<connectionDelegate>
Initialize the OfferRequest object and set it's delegate:
-(void)viewWillAppear:(BOOL)animated
{
connection = [[connectionClass alloc]init];
connection.delegate = self;
[connection connectionWithURL:[NSString stringWithFormat:#"pass your url here"]];
}
The delegate method will have your values
-(void)connectionSucceed:(NSData *)data
{
NSError *error;
self.dictionary = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error];
//nslog your data
}
//Connection failure
-(void)connectionFailed:(NSError *)error
{
//handle error message
}

Answer 2

Ok, I don't know where the problem exactly was, but what I did to fix it, was to create a new init method, where I pass the delegate:
-(instancetype)initWithDelegate: (id<OfferRequestDelegate>) delegate {
self = [super init];
if (self) {
self.delegate = delegate;
}
return self;
}
So I initialize the OfferRequest object in the VC and pass self and now it works.

Answer 3

I guess delegate should be a pointer object and not the object.
It may be help you
#property (nonatomic, weak) NSObject <OfferRequestDelegate> *delegate;
and make should your delegate is been set, i.e. make sure your code below is getting called.
[self.delegate addOfferRequest:self dataFromRequest:result];