Image URL JSON parse to UIImageView in app error

Question

I'm trying to parse an image url through JSON in my iPhone application. My json model is built like this:

{
   "picture":"link_to_image.jpg",
   "about":"about text here",
   "name":"Name"
}

I use this code to parse the itemw in my app:

- (void)fetchedData:(NSData *)responseData
{
    NSError *error;
    NSDictionary *json = [NSJSONSerialization JSONObjectWithData:responseData
                                                         options:kNilOptions error:&error];

    self.titleLabel.text = [json objectForKey:@"name"];
    self.aboutText.text = [json objectForKey:@"about"];
    self.profileImage.image = [json objectForKey:@"picture"];
}

And in ViewDidLoad I wrote this:

dispatch_queue_t queue = dispatch_get_global_queue
    (DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
       dispatch_async(queue,  ^{
        NSData *data = [NSData dataWithContentsOfURL:
                        [NSURL URLWithString:@"link_to_my_json_file.php"]];
        [self performSelectorOnMainThread:@selector(fetchedData:)
                               withObject:data waitUntilDone:YES];
    });

I've connected the outlets to the items in my .xib-file and the title and about text are successfully parsed to the label and textview. But the image won't parse. The app keeps crashing when I try this for the image.

Can someone please explain what I'm doing wrong?

Thanks!

(You realize that you're putting an NSString pointer into self.profileImage.image, right? It's not an image, just its name.) — Hot Licks
– Hot Licks, Commented Oct 2, 2013 at 19:09
(And you also realize that, since you're dispatching that code async, the results from it will not be immediately available, right?) — Hot Licks
– Hot Licks, Commented Oct 2, 2013 at 19:10
I'm sorry. I'm just getting started with Objective-C now... NSLog says: "Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString _isResizable]:..." @HotLicks — tracifycray
– tracifycray, Commented Oct 2, 2013 at 19:17

Sviatoslav Yakymiv · Accepted Answer · 2013-10-03 05:51:36Z

1

As @Hot Licks have mentioned in comments you are putting a NSString pointer into UIImage property. Following method should work.

- (void)fetchedData:(NSData *)responseData
{
    NSError *error;
    NSDictionary *json = [NSJSONSerialization JSONObjectWithData:responseData
                                                         options:kNilOptions error:&error];
    self.titleLabel.text = [json objectForKey:@"name"];
    self.aboutText.text = [json objectForKey:@"about"];
    NSURL *URL = [NSURL URLWithString: [json objectForKey:@"picture"]];
    dispatch_queue_t queue = dispatch_get_global_queue
    (DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
       dispatch_async(queue,  ^{
        NSData *data = [NSData dataWithContentsOfURL: URL];
        self.profileImage.image = [UIImage imageWithData: data];
    });
}

edited Oct 3, 2013 at 5:51

answered Oct 2, 2013 at 20:04

Sviatoslav Yakymiv

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4 Comments

Hot Licks Over a year ago

But it needs to be noted that none of those values will be set on exit from the sequence in viewDidLoad, but at some later time.

tracifycray Over a year ago

I get "Parse Issue Expected identifier" on the line:NSURL *URL = [[NSURL URLWithString: [json objectForKey:@"picture"]];

Hot Licks Over a year ago

@DavidGabor - Count your brackets.

Sviatoslav Yakymiv Over a year ago

I have removed one bracket.

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