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iOS Issues

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Hello everyone, I recently went through the iOS tutorial and tried to get it working on an iOS 8.4 device. Aside from some property identifier changes, it seemed that the tutorial lined up pretty well with the current version of the iOS SDK (Xcode 6). Upon running it however, I noticed that it wasn't working correctly. The processImage: method for the delegate is in fact being called, however any changes made to the image passed in result in no visible changes on the screen (the invert in the tutorial did not invert any colors). I did some inspecting while execution was paused in that method and it seems that the data within the 'image' matrix is valid. It just doesn't seem to reflect any change on it's view. I've downloaded and tried several other tutorials scattered across the internet, but everything seems to suffer from the same issue. Has anyone else run into this issue? If so what was your solution? Thanks!

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