Image view not updating on NSThread?

Technically NSThread itself do not create run loop automatically, then the performSelector:onThread won't work if you just create thread that way.

Never change anything in a currently displayed UIView from a background thread. There are a million different synchronization problems that you can encounter. Download the image in the background thread, and then call another method on the main thread (from the background thread) to actually update the UIImageView.

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