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It's in the the Xcode 7.3 release notes, which for some reason aren't loading for me. Here's a screenshot I took earlier however.

http://i.imgur.com/oXAPsyd.png

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Very interesting. Apple has replicated f.lux's functionality and removed access to the key ingredient used in the authors original implementation. All in one felt swoop.

They were definitely paying close attention to that whole "side load our proprietary blob using Xcode" debacle on HN 2 months ago.

f.lux for iOS announcement: https://news.ycombinator.com/item?id=10544770

Apple's actions the next day: https://news.ycombinator.com/item?id=10556375

While it is a huge PITA, frameworks can still be reverse engineered - though not having headers makes it a lot harder.

Private frameworks have never come with headers (on either OS X or iOS). This change only affects linking, and it only means that you have to create the .tbd files (just a list of available symbols) for ld to use manually - or use dlsym or other workarounds.

It's "one fell swoop", unless you're swooping down on a billiards table, which is covered in felt.

Bah, I always screw that one up. I wrote that during my lunch break and it's too late to edit, but I appreciate the polite pedantry.

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