I don't like Swift and I like Objective C much more. I learned Swift, so I can read it, but I'll use Objective C whenever I can. May be there are more people out there with similar point of view.
e.g. -[NSBezierPath setLineDash:count:phase:] takes a C array in Objective-C, but an UnsafePointer<CGFloat> in Swift.
Apple needs new API interfaces for their new language, and that will take time.
https://github.com/apple/swift-evolution/blob/master/proposa...
At some point in the future I imagine we would also see native Swift APIs.