So I'm trying to return a random dictionary from an array of dictionaries using a function in Swift.

Here is the part not working:

//method for returning a random array from the collection sourse without doing it twice...
func noRepeatArray(array: Array) -> Dictionary{
    let newRandomNumber = randomNumber()
    let randomSet = array[newRandomNumber]
    let canUseSet: Bool
    
    if(temp.contains(randomSet)){
        newRandomNumber == randomNumber()
        canUseSet = false
    } else {
        temp.append(randomSet)
        canUseSet = true
    }
    if canUseSet == true {
        return randomSet
    }
}

Here is the code around it:

//Slot Types for Button
enum slotNumber {
    case slotOne
    case slotTwo
    case slotThree
    case slotFour
    
}

//Historical Events dictionaries
let appleHistoryI: [[slotNumber: String]] = [[.slotOne :"Macintosh"], [.slotTwo :"Apple II"],[.slotThree :"PowerPC"], [.slotFour : "PowerBookG4"]]
let appleHistoryII: [[slotNumber: String]] = [[.slotOne :"Macintosh"], [.slotTwo :"Apple II"],[.slotThree :"PowerPC"], [.slotFour : "PowerBookG4"]]
let presidants: [[slotNumber: String]] = [[.slotOne :"Macintosh"], [.slotTwo :"Apple II"],[.slotThree :"PowerPC"], [.slotFour : "PowerBookG4"]]
let gameOfThrones: [[slotNumber: String]] = [[.slotOne :"Macintosh"], [.slotTwo :"Apple II"],[.slotThree :"PowerPC"], [.slotFour : "PowerBookG4"]]

//collection of dictionaries...
let collectionOfDictionaries = [
    appleHistoryI,
    appleHistoryII,
    presidants,
    gameOfThrones
]

//random number method
func randomNumber() -> Int{
    let randomNumber = GKRandomSource.sharedRandom().nextIntWithUpperBound(collectionOfDictionaries.count)
    return randomNumber
}
//method for returning a random array from the collection sourse without doing it twice...
func noRepeatArray(array: AnyObject) -> AnyObject{
    let newRandomNumber = randomNumber()
    let randomSet = array[newRandomNumber]
    let canUseSet: Bool
    
    if(temp.contains(randomSet)){
        newRandomNumber == randomNumber()
        canUseSet = false
    } else {
        temp.append(randomSet)
        canUseSet = true
    }
    if canUseSet == true {
        return randomSet
    }
}
//temperary collection to keep track of used arrays
let temp = []

Is there a better way i should do this or do i need to figure a way to return dictionaries?