CODEWITHSUNDEEP
iphoneobjective-cios
Ed F
Ed F

Reputation: 33

iOS Objective-C: Using URLConnection multiple times

I have an array of objects. My object contains a URL(NSString) and an image (UIImage). I call a webservice to populate all the urls for the images and then I want to asynchronously get the image and update the object with the image.

I am stuck while I am trying to determine the index of the array which I need to update when the data is received from URLConnection. Any thoughts?

Upvotes: 1

Views: 756

Answers (3)

Leena
Leena

Reputation: 2676

I would suggest you to use GCD to download image in background. Here is the tutorial if you want to refer:- http://blog.slaunchaman.com/2011/02/28/cocoa-touch-tutorial-using-grand-central-dispatch-for-asynchronous-table-view-cells/

Following is the Code you can use:-

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0ul);

dispatch_async(queue, ^{
    UIImage *image = [UIImage imageWithContentsOfFile:imagePath];

    dispatch_sync(dispatch_get_main_queue(), ^{
        [yourImageView setImage:image];
    });
});

Upvotes: 0

Ben-G
Ben-G

Reputation: 5026

You need to map the NSURLConnection to your Array. You could either subclass NSURLConnection to add a member, wich allows storing a tag identifier, such as an index.

Probably it would be simpler to create a NSDictionary, where each NSURLConnection acts as key and the arrayIndex in an NSNumber would be stored as the value.

In the callback-method you are using, you could access your dictionary with the according NSURLConnection as its key.

int arrayIndex = [[myDictionary objectForKey:urlConnection] intValue]

Upvotes: 1

Sanchit Paurush
Sanchit Paurush

Reputation: 6152

For getting UIImage from net use this instead of URLConnection multiple times.

 UIImage *image=[[UIImage alloc]initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"URL of the image"]]];

Then load your image asynchronously in the UIImageView.

Upvotes: 0

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