allOptions.swift

import UIKit

func allOptions<T: RawOptionSetType where T.RawValue == UInt>(optionSet: T) -> [T] {
    var options = [T]()
    var mask: UInt = 1
    while mask != 0 {
        if let newOption = T(rawValue: mask) where (optionSet & newOption) == newOption {
            options.append(newOption)
        }
        mask <<= 1
    }
    return options
}

let optionSet: UIViewAnimationOptions = .LayoutSubviews | .AllowAnimatedContent | .TransitionFlipFromRight

for option in allOptions(optionSet) {
    typealias T = UIViewAnimationOptions
    switch option {
    case T.LayoutSubviews:
        println("layout subviews")
    case T.TransitionFlipFromLeft:
        println("not reached")
    case T.AllowAnimatedContent:
        println("allow animated content")
    default:
        println("this prints once: \(option)")
    }
}