PINCachedAnimatedImage: Fix retain cycles

pinterest / PINRemoteImage

A thread safe, performant, feature rich image fetcher

Apache License 2.0

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Closed bolsinga closed 4 years ago

bolsinga commented 4 years ago

Use NSNotificationCenter selector based observation.
Remove retain cycles when dispatching async to PINOperation and dispatch_async
Use internal methods since this code uses lots of ivars, which have implicit self references that are hard to find.
Add test that fails without this fix.