How can I use QLPreviewController in iOS to display image or file using http address?

Question

I' m trying to use QLPreviewController to display files located in the web by http address. For example I want it to display image located here: http://iosdevelopertips.com/wp-content/uploads/2011/05/preview.jpg

In previewItemAtIndex I did this:

NSString* url = @"http://iosdevelopertips.com/wp-content/uploads/2011/05/preview.jpg";
return [NSURL URLWithString: url];

But when I click on the image in my tableview it appears Loading... indicator of the QLPreviewController which is rotating endlessly and in the log I see this message: Couldn't issue file extension for path: /wp-content/uploads/2011/05/preview.jpg

So the question how can I display files in QLPreviewController located in the web using http address in NSURL ? What am I doing wrong? Thanks.

Answer 1

You need to download the items yourself and then pass file URLs to the preview controller. The preview controller only deals with the display and user interaction for you.