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Yeah as nice as Swift is, Cocoa was designed for Objective-C.

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.

If you use this API very often from Swift you can introduce nice wrapper around it. It would be better to see these issues by Apple but I think they are minor and Swift overweights with its benefits.

This will improve in Swift 3.0, via an improved mapping of Cocoa APIs into Swift (naming wise):

https://github.com/apple/swift-evolution/blob/master/proposa...

At some point in the future I imagine we would also see native Swift APIs.

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