CODEWITHSUNDEEP
iphoneiosobjective-c
Luke Smith
Luke Smith

Reputation: 692

How do you get the NSURLConnection delegate methods to trigger?

I can't seem to get the delegate methods to call, when I load the view associated with this class.. none of them fire. I'm sure it's something that I've overlooked but I can't for the life of me figure out why.

DownloadUpdates.h

#import <UIKit/UIKit.h>

@interface DownloadUpdates : UIViewController

    @property (strong, nonatomic) NSMutableData *responseData;
    @property (strong, nonatomic) NSURLConnection *connection;

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

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

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

- (void)connectionDidFinishLoading:(NSURLConnection *)connection;

@end

DownloadUpdates.m

The URL has been removed for privacy purposes, but it's just making a call to an API which will be returning JSON data. This URL functions as expected so it's an issue with the code. 

#import "DownloadUpdates.h"

@interface DownloadUpdates ()

@end

@implementation DownloadUpdates

- (void)connection:(NSURLConnection *)_connection didReceiveResponse:(NSURLResponse *)response
{
    _responseData = [[NSMutableData alloc] init];
    NSLog(@"Response received");
}

- (void)connection:(NSURLConnection *)_connection didReceiveData:(NSData *)data
{
    [_responseData appendData:data];
        NSLog(@"Data received");
}

- (void)connection:(NSURLConnection *)_connection didFailWithError:(NSError *)error
{
    NSLog(@"Unable to fetch data");
}

- (void)connectionDidFinishLoading:(NSURLConnection *)_connection
{
    NSLog(@"Succeeded! Received %d bytes of data",[_responseData
                                                   length]);
//    NSString *txt = [[NSString alloc] initWithData:_responseData encoding: NSASCIIStringEncoding];
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSURL *myURL = [NSURL URLWithString:@"URL HERE"];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:myURL cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:60];

    _connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    // Do any additional setup after loading the view.
}

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

@end

I'd appreciate any help / advice you can offer.

Upvotes: 1

Views: 151

Answers (2)

Rob
Rob

Reputation: 438277

I'd suggest putting a NSLog or breakpoint in viewDidLoad to make sure this is getting called at all. For example, this might happen if you neglected to specify DownloadUpdates as the class for your storyboard scene.

Upvotes: 0

Gabriel
Gabriel

Reputation: 3359

Use the properties to apply the strong modifier:

self.responsedata = [[NSMutableData alloc] init];
(.....)
self.connection = [[NSURLConnection alloc] initWithRequest: ....etc...

Upvotes: 2

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