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When Apple rewrote iPhoto as the Photos application a few years ago, they used a private framework called UXKit that also implements UIKit on the Mac. They've

When Apple rewrote iPhoto as the Photos application a few years ago, they used a private framework called UXKit that also implements UIKit on the Mac. They've been working on this for a while. http://www.idownloadblog.com/2015/02/05/photos-mac-uxkit/ http://www.idownloadblog.com/2015/02/05/photos-mac-uxkit/

saagarjha 8y ago
It doesn't implement UIKit; it provides a shim on top of AppKit that makes the API look similar to UIKit.
tinus_hn 8y ago
Apple always had UIKit working on the Mac, the iOS device emulator runs it.