contains() in Xcode 7 Beta 5

问题

so I'm having a problem with my contains method in beta 5. specifically it says it is unavailable when using this code:

class func createSlot(currentCards: [Slot]) -> Slot {
    var currentCardValues:[Int] = []

    for slot in currentCards {
        currentCardValues.append(slot.value)
    }
    var randomNumber:Int = Int(arc4random_uniform(UInt32(13)))
    while contains(currentCardValues, randomNumber + 1) {
        randomNumber = Int(arc4random_uniform(UInt32(13)))
    }

Any help would be appreciated, not sure if it is a problem with the beta or just my new working with Swift 2, as it works in Xcode 6

回答1:

The problem is that contains() is no longer a global method that accepts a sequence as an argument. Instead, the method must be called on the sequence

In your case, you should change contains(currentCardValues, randomNumber + 1) to currentCardValues.contains(randomNumber + 1)

Swift 1.x

let myNumbers: [Int] = [0, 1, 2, 3, 4]
let number: Int = 3
let contains: Bool = contains(myNumbers, number) //true

Swift 2.x

let myNumbers: [Int] = [0, 1, 2, 3, 4]
let number: Int = 3
let contains: Bool = myNumbers.contains(number) //true

来源：https://stackoverflow.com/questions/32159295/contains-in-xcode-7-beta-5