On Mar 19, 2010, at 6:40 PM, Michael Davey wrote: > OK, so I have changed the code to show a placeholder image, but I am a little > uncertain as to how to fetch the images asynchronously. I could start a > background thread with performSelectorInBackground, but am concerned that > this would spawn far too many threads - does anyone have any suggestions?
You might want to use an NSOperationQueue. Define NSOperation instances, each fetching one or more images. For each fetching NSOperation you define, you should also define a "cleanup" NSOperation, dependent on its associated fetching one, so that when the fetching one ends, the cleanup one then swaps the placeholder image out and the fetched images in. Make sure, though, that this swap happens in the main thread, meaning that the cleanup NSOperation should invoke a -performSelectorInMainThread method, rather than access the UI directly._______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
