How to force a raw value of 7 into a UIViewAnimationCurve enum?

Question

The key UIKeyboardAnimationCurveUserInfoKey in the userInfo dictionary of a UIKeyboardWillShowNotification contains an Int with the value 7.

Now I need to pass this Int into UIView.setAnimationCurve(<here>). I tried to create the required UIViewAnimationCurve enum like this UIViewAnimationCurve(rawValue: 7). Because the raw value 7 is undocumented, the result is always nil.

It works fine this way in Objective-C. Any idea how to get this animation curve from the notification into a UIView animation using Swift?

Update: As pointed out by Martin, this is no longer a problem since Xcode 6.3.

From the Xcode 6.3 Release Notes:

Imported NS_ENUM types with undocumented values, such as UIViewAnimationCurve, can now be converted from their raw integer values using the init(rawValue:) initializer without being reset to nil. Code that used unsafeBitCast as a workaround for this issue can be written to use the raw value initializer.

Koh

Note that this problem does not exist anymore in Swift 1.2, as documented in the Xcode 6.3 release notes. – Laparotomy

Answer 1

I think I figured it out, but I'm not sure if this is the way it's supposed to be done.

let animationCurve = unsafeBitCast(7, UIViewAnimationCurve.self)
UIView.setAnimationCurve(animationCurve)

Update: The solution contained in this question works as well.

var animationCurve = UIViewAnimationCurve.EaseInOut
NSNumber(integer: 7).getValue(&animationCurve)

Koh