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Apple’s first GitHub-released open source project is a big thing. There’s much to learn here - I’ve spent some time reading through the source, here are my observations. firstResponder In UIKit, unlike AppKit on the Mac, there’s currently no public way to detect the first responder. There are several clever and less clever workarounds (like iterating over all views) or using a weak variable and UIApplication’s sendAction:. Of course Apple hit this issue in ResearchKit as well and their solution ...