Is it possible to use Swift's Enum in Obj-C?

As of Swift version 1.2 (Xcode 6.3) you can. Simply prefix the enum declaration with @objc

@objc enum Bear: Int {
    case Black, Grizzly, Polar
}

Shamelessly taken from the Swift Blog

Note: This would not work for String enums or enums with associated values. Your enum will need to be Int-bound

---

In Objective-C this would look like

Bear type = BearBlack;
switch (type) {
    case BearBlack:
    case BearGrizzly:
    case BearPolar:
       [self runLikeHell];
}

To expand on the selected answer...

It is possible to share Swift style enums between Swift and Objective-C using NS_ENUM().

They just need to be defined in an Objective-C context using NS_ENUM() and they are made available using Swift dot notation.

From the Using Swift with Cocoa and Objective-C

Swift imports as a Swift enumeration any C-style enumeration marked with the NS_ENUM macro. This means that the prefixes to enumeration value names are truncated when they are imported into Swift, whether they’re defined in system frameworks or in custom code.

Objective-C

typedef NS_ENUM(NSInteger, UITableViewCellStyle) {
   UITableViewCellStyleDefault,
   UITableViewCellStyleValue1,
   UITableViewCellStyleValue2,
   UITableViewCellStyleSubtitle
};

Swift

let cellStyle: UITableViewCellStyle = .Default

From the Using Swift with Cocoa and Objective-C guide:

A Swift class or protocol must be marked with the @objc attribute to be accessible and usable in Objective-C. [...]

You’ll have access to anything within a class or protocol that’s marked with the @objc attribute as long as it’s compatible with Objective-C. This excludes Swift-only features such as those listed here:

Generics Tuples / Enumerations defined in Swift / Structures defined in Swift / Top-level functions defined in Swift / Global variables defined in Swift / Typealiases defined in Swift / Swift-style variadics / Nested types / Curried functions

So, no, you can't use a Swift enum in an Objective-C class.